English Intern
    Institut für Organische Chemie

    Publikationen / Publications

    1990

    164
    M. K. Kindermann, R. Poppek, P. Rademacher, A. Fuß, H. Quast
    Gas-Phase Thermolysis of 4-Substituted 3,5-Dihydro-3,3,5,5-tetramethyl-4H-pyrazoles Studied by Photoelectron Spectroscopy and Flash Vacuum Pyrolysis
    Chem. Ber., 1990, 124, 1161 - 1168

    165
    H. Quast, G. Meichsner, D. Regnat, K. Banert, E.-M. Peters, K. Peters, H. G. von Schnering
    Ein 1,5-Diazabicyclo[3.3.0]octa-2,7-dien aus Acetylen-dicarbonsäure-dimethylester und einem 3,5-Dihydro-4H-1,2,3-triazol-4-on
    Liebigs Ann. Chem., 1990, 465 - 467

    166
    H. Quast, D. Regnat, E.-M. Peters, K. Peters, H. G. von Schnering
    Zwitterionen als Zwischenstufen der 1,3-Dipolaren Cycloaddition elektrophiler Azide an 5-Alkylidendihydrotetrazole- der andere nicht-konzertierte Grenzfall
    Angew. Chem., 1990, 102, 724 - 726; Angew. Chem. Int. Ed. Engl., 1990, 29, 695 - 697

    167
    H. Quast, J. Schulze
    Neopentylierung von Phenolen und Hydrochinonen
    Liebigs Ann. Chem., 1990, 509 - 512

    168
    H. Quast, L. Bieber, D. Regnat
    Thermolyse von 5-Alkyliden-1,4-dihydro-5H-tetrazolen
    Chem. Ber., 1990, 123, 1739 - 1747

    169
    H. Quast, D. Regnat
    Photochemische Bildung von Heteromethylencyclopropanen 19. Synthese und Photolyse von 1,4,4-Trialkyl-4,5-dihydro-5-imino-1H-1,2,3-triazolen. Regio- und diastereoselektive Bildung von (Z)-Aziridiniminen
    Chem. Ber., 1990, 123, 2195 - 2202

    1991

    170
    H. Quast, H. Jakobi, B. Seiferling
    Photochemische Bildung von Heteromethylencyclopropanen 20. Diastereomere 3,3,5,5-Tetraalkyl-3,5-dihydro-4H-pyrazol-4-one
    Liebigs Ann. Chem., 1991, 41 - 46

    171
    Quast, H. Leybach
    Synthese eines chiralen, nicht-racemischen Aziridinons (*-Lactams)
    Chem. Ber., 1991, 124, 849 - 859

    172
    H. Quast, D. Regnat, J. Balthasar, K. Banert, E.-M. Peters, K. Peters, H. G. von Schnering
    5-Imino-1,4,5,6-tetrahydro-1,2,3,4-tetrazine aus 5-Alkyliden-4,5-dihydro-1H-tetrazolen und elektrophilen Aziden
    Liebigs Ann. Chem., 1991, 409 - 416

    173
    H. Quast, H. Jakobi
    Photochemical Formation of Heteromethylenecyclopropanes 21. Photoreduction on Irradiation of 3,3,5,5-Tetramethyl-4-methylene-1-pyrazoline. An Overlooked Example of a Reaction Competing with the Extrusion of Molecular Nitrogen from Reluctant Azoalkanes
    Chem. Ber., 1991, 24, 1613 - 1618

    174
    H. Quast, H. Jakobi
    Photochemical Formation of Heteromethylenecyclopropanes 22. Retention of Configuration and E/Z Stereoselectivity in the Photolysis of cis- and trans-Tetraalkyl-4-methylene- 1-pyrazolines
    Chem. Ber., 1991, 124, 1619 - 1626

    175
    H. Quast, A. Fuß, H. Jakobi
    Photochemical Formation of Heteromethylenecyclopropanes 23. Photolysis of Tetralkyl-1-pyrazoline-4-thiones. * Diastereoselective Formation of (E)/(Z)-Alkylidenethiiranes from cis- and trans-Tetraalkyl-1-pyrazoline-4-thiones
    Chem. Ber., 1991, 124, 1747 - 1755

    176
    H. Quast, A. Fuß, A. Heublein, H. Jakobi, B. Seiferling
    Photochemical Formation of Heteromethylenecyclopropanes 24.Retention of Configuration in Two Photochemical Reactions: Formation of Cyclopropanimines by Extrusion of Molecular Nitrogen from Tetraalkyl-4-imino-1-pyrazolines and [2+1]-Cycloreversion of Cyclopropanimines to Isocyanides and Alkenes
    Chem. Ber., 1991, 124, 2545 - 2554

    177
    H. Quast, H. Leybach
    Stereochemie der Ringöffnung von Aziridinonen (a-Lactamen)
    Chem. Ber., 1991, 124, 2105 - 2112

    178
    H. Quast, R. Janiak
    An Improved Synthesis of Bicyclo[3.3.0]octane-2,6-dione
    Liebigs Ann. Chem., 1991, 1305 - 1308

    1992

    179
    R. Sustmann, W. Sicking, H. Quast
    Analysis of an Intermediate in a 1,3-Dipolar Cycloaddition of Methylsulfonyl Azide
    J. Comput. Chem., 1992, 13, 314 - 317

    180
    H. Quast, H. Leybach, E.-U. Würthwein
    Thermische Reorganisation und Cycloadditionen eines chiralen, nicht-racemischen Aziridinons (a-Lactams) sowie ab initio-Berechnungen zur C2H3NO-Energie-Hyperfläche
    Chem. Ber., 1992, 125, 1249 - 1262

    181
    H. Quast, J. Carlsen, R. Janiak, E.-M. Peters, K. Peters, H. G. von Schnering
    Synthesis and X-Ray Diffraction Analysis of Bis(phenyl-sulfonyl)semibullvalenes. Lifting of the Degeneracy of Semibullvalenes in the Crystal Lattice
    Chem. Ber., 1992, 125, 955 * 968

    182
    N. Hüsing, W. Rothe, W. Kiefer, H. Quast
    Notiz zur Synthese des 3,7-Dicyan-1,5-dimethylsemibullvalens
    Liebigs Ann. Chem., 1992, 297 - 298

    183
    H. Quast, R. Janiak, E.-M. Peters, K. Peters, H. G. von Schnering
    2,6-Dicyansemibullvalen
    Chem. Ber., 1992, 125, 969 - 973

    184
    H. Quast, J. Carlsen, T. Herkert, R. Janiak, H. Röschert, E.-M. Peters, K. Peters, H. G. von Schnering
    Stereochemie der Addition von Phenylmetall-Reagenzien an Bicyclo[3.3.0]octandione und -octadiendione. Synthese phenylsubstituierter Bicyclo[3.3.0]octadiene
    Liebigs Ann. Chem., 1992, 495 - 511

    185
    H. Quast, T. Hergenröther
    5-Alkyliden-4,5-dihydro-1H-tetrazole mit Vinyl- oder Phenyl-Substituenten
    Liebigs Ann. Chem., 1992, 581 - 590

    186
    H. Quast, T. Hergenröther
    Photoextrusion von molekularem Stickstoff aus 5-Alkyliden-4,5-dihydro-1H-tetrazolen mit Vinyl- oder Phenyl-Substituenten. (E)-Aziridinimine und neuartige Produkte
    Chem. Ber., 1992, 125, 2095 - 2101

    187
    H. Quast, J. Carlsen, H. Röschert, E.-M. Peters, K. Peters, H. G. von Schnering
    Synthese, Struktur und Reaktionen Phenylethinyl-substituierter Bicyclo[3.3.0]octane
    Chem. Ber., 1992, 125, 2591 - 2611

    188
    H. Quast, J. Carlsen, C. A. Klaubert, E.-M. Peters, K. Peters, H. G. von Schnering
    Neuartige Tricyclen aus Bis(arylthio)bicyclo[3.3.0]octadienen und Trimethylsilylcyanid in Gegenwart von Titan(IV)-chlorid und Methanol
    Liebigs Ann. Chem., 1992, 759 - 768

    189
    H. Quast, A. Witzel, E.-M. Peters, K. Peters, H. G. von Schnering
    2,6-Dimethyl Semibullvalene-2,6-dicarboxylates
    Chem. Ber., 1992, 125, 2613 - 2623

    190
    K. Peters, E.-M. Peters, H. G. von Schnering, H. Quast, J. Stawitz
    Crystal structure refinement of bishomo(dihydro)tetraaza-[14]annulene bis(hydroperchlorate), C12H16N4(HClO4)2
    Z. Kristallogr., 1992, 199, 284 - 286

    191
    H. Quast, J. Balthasar, T. Hergenröther, D. Regnat
    Thermolyse von 1,2,3,4,6,7,8-Heptaazaspiro[4.4]nona-2,7-dienen, [3 + 2]-Cycloaddukten von Aziden an 5-Alkyliden-4,5-dihydro-1H-tetrazole
    Chem. Ber., 1992, 125, 2749 - 2756

    192
    H. Quast, J. Carlsen
    Diphenyl- and Bis(phenylethynyl)semibullvalenes
    Chem. Ber., 1992, 125, 2757 - 2763

    193
    H. Quast, M. Ach, E.-M. Peters, K. Peters, H. G. von Schnering
    1,3-Dipolare Cycloaddition elektrophiler Azide an cyclische Keten-N,X-acetale. - Stickstoff-Extrusion und Ringerweiterung der [3+2]Cycloaddukte
    Liebigs Ann. Chem., 1992, 1259 - 1269

    194
    H. Quast, T. Hergenröther
    Photolyse von 3-Methyl-5,5-diphenyl-3,5-dihydro-4H-1,2,3-triazol-4-on
    Chem. Ber., 1992, 125, 2625 - 2627

    195
    A. Mittelbach, W. Hönle, H. G. von Schnering, J. Carlsen, R. Janiak, H. Quast
    Optimierung der Herstellung und Trennung von Fullerenen
    Angew. Chem., 1992, 104, 1681 - 1683; Angew. Chem. Int. Ed. Engl., 1992, 31, 1640

    196
    K. Peters, E.-M. Peters, H. G. von Schnering, H. Quast, H. Röschert
    Crystal structure of 1,5-dimethyl-6-phenyl-2-phenylethinyl-bicyclo[3.3.0]octane-2,6-diol, C24H26O2
    Z. Kristallogr., 1992, 202, 306 - 308

    1993

    197
    H. Quast, M. Ach, M. K. Kindermann, P. Rademacher, M. Schindler
    Synthese, NMR-Spektren und Photoelektronen-Spektren von cyclischen Keten-N,X-acetalen (2-Alkyliden-N-heterocyclen)
    Chem. Ber., 1993, 126, 503 - 516

    198
    H. Quast, T. Hergenröther, K. Banert, E.-M. Peters, K. Peters, H. G. von Schnering
    Zur Tautomerie von 5,5-Diphenyldihydro-3H-1,2,3-triazol-4-on und 5-Amino-4,4-diphenyl-4H-1,2,3-triazolen
    Chem. Ber., 1993, 126, 103 - 108

    199
    K. Bergmann, S. Görtler, J. Manz, H. Quast
    Fundamental Frequencies Increasing with Reduced Masses: An Inverse Quantum Isotope Effect in Molecules with Shallow Double Well Potentials, e. g. Semibullvalenes
    J. Am. Chem. Soc., 1993, 115, 1490 - 1495

    200
    H. Quast, K. Knoll, E.-M. Peters, K. Peters, H. G. von Schnering
    2,4,6,8-Tetraphenylbarbaralan - ein orange-roter, thermochromer Kohlenwasserstoff ohne Chromophor
    Chem. Ber., 1993, 126, 1047 - 1060

    201
    H. Quast, J. Carlsen, R. Janiak
    Synthesis of 2,6-Diphenylbarbaralane by Oxidation of Dipotassium 2,6-Diphenylbicyclo[3.3.1]nonadienediide with 1,2-Dibromoethane. - Preparative Reversed-Phase Liquid Chromatography of Hydrocarbons
    Chem. Ber., 1993, 126, 1461 - 1463

    202
    H. Quast, E. Geißler, T. Herkert, K. Knoll, E.-M. Peters, K. Peters, H. G. von Schnering
    2,6-Dicyan-4,8-diphenylbarbaralan
    Chem. Ber., 1993, 126, 1465 - 1475

    203
    H. Quast, M. Witzel
    Synthesis of Tetramethyl 2,6-Dihydroxybicyclo[3.3.1]nona-2,6-diene-1,3,5,7-tetracarboxylate (Meerwein Ester) - Use of tert-Butyl Methyl Ether Instead of Benzene in Azetropic Distillation
    Liebigs Ann. Chem., 1993, 699 - 700

    204
    H. Quast, K. Knoll, E.-M. Peters, K. Peters, H. G. von Schnering
    Synthese und Struktur Phenyl-substituierter Bicyclo[3.3.1]-nonene
    Liebigs Ann. Chem., 1993, 777 - 784

    205
    M. K. Kindermann, K. Kowski, P. Rademacher, H. Quast
    Elektronische Struktur und Gasphasenpyrolyse von 4-substituierten 3,5,5-Trialkyl-3,5-dihydro-4H-1,2,3-triazolen untersucht durch Photoelektronenspektroskopie und semiempirische Rechnungen
    Chem. Ber., 1993, 126, 2675 - 2681

    1994

    206
    H. Quast, C. Becker, E. Geißler, K. Knoll, E.-M. Peters, K. Peters, H. G. von Schnering
    Konformation und Bromierung von Bicyclo[3.3.1]nonan-2,6-dion sowie Dehydrobromierung der Bromketone. - Verbesserte Herstellung von Bicyclo[3.3.1]-nona-3,7-dien-2,6-dion
    Liebigs Ann. Chem., 1994, 109 - 120

    208
    W. von der Saal, R. Reinhardt, H.-M. Seidenspinner, J Stawitz, H. Quast
    Synthese und 1H-NMR-Spektren diastereomerenreiner 1,2-Cyclopropandiamine und 1,2-Cyclopropandiammonium-Dibromide
    Liebigs Ann. Chem., 1994, 569 - 579

    209
    H. Quast, S. Aldenkortt, E. Heller, P. Schäfer, E. Schmitt
    Synthesis and Thermolysis of a Chiral, Non-Racemic Iminoaziridine
    Chem. Ber., 1994, 127, 1699 - 1706

    1995

    210
    H. G. von Schnering, W. Hönle, A. Mittelbach, J. Carlsen, R. Janiak, H. Quast DOS DE 42 24 556 A1 (24.7.92/27.1.94)
    Verfahren zur Herstellung und Auftrennung von Fullerenen
    Chem. Abstr., 1995

    211
    H. Quast, M. Witzel, E.-M. Peters, K. Peters, H. G. von Schnering
    Synthesis and Structures of 3,7-Substituted Barbaralanes
    Liebigs Ann. Chem., 1995, 725 - 738

    212
    H. Quast, T. Dietz
    Dehydration of Secondary Alcohols via Thermolysis of In Situ Generated Alkyl Diphenyl Phosphates: An Inexpensive and Environmentally Compatible Method for the Preparation of Alkenes
    Synthesis, 1995, 1300 - 1304

    213
    W. von der Saal, H. Quast
    Cyclopropanediamines, 5. Ring-Opening and Cis-Trans Isomerization of 1,2-Cyclopropanediamines in Aqueous Buffers
    J. Org. Chem., 1995, 60, 4024 - 4029

    214
    H. Quast, T. Dietz, E.-M. Peters, K. Peters, H. G. von Schnering
    Optimised Preparation of 1,5-Dialkylsemibullvalenes
    Liebigs Ann. Chem., 1995, 1159 - 1168

    215
    M. Dohle, J. Manz, G. K. Paramonov, H. Quast
    Design of substituted semibullvalenes suitable for control of the Cope rearrangement by two ps IR laser pulses
    Chem. Phys., 1995, 91 - 97

    216
    H. Quast, T. Dietz, A. Witzel
    Tetra(2,6-dichlorophenyl)porphyrin * a Superior Sensitizer for the Singlet-Oxygen Ene Reaction (Schenck-Reaction)
    Liebigs Ann. Chem., 1995, 1495 - 1501

    217
    H. Quast, S. Aldenkortt, P. Schäfer, E. Schmitt, E.-U. Würthwein
    Synthesis and Thermal Reorganisations of Iminoaziridines. Ab Initio Calculations of Their Transition States, of Diazatrimethylenemethanes, and Some Cyclic Members of the C2H4N2 Potential-Energy-Hypersurface
    Liebigs Ann. Chem., 1995, 2171 - 2188

    1996

    218
    H. Quast, S. Aldenkortt, B. Freudenreich, P. Schäfer, E.-M. Peters, K. Peters, H.G. von Shnering, E.-U. Würtwein
    Ring Opening Reactions of Iminoaziridines and Aminoazirinium Ions. Is Electric Ring Opening of 2H-Azirinium Ions a Myth?
    Liebigs Ann. Chem., 1996, 87-98

    219
    H. Quast, S. Aldenkortt
    A Novel Route to Racemic and Non-racemic Products of the Ugi Reaction: Synthesis od Ugi's Labile a-Adducts from Iminoaziridines and Carboxyclic Acids and Their Transformations.
    Chem. Europ. J., 1996, 462-469

    220
    H. M. Muchall, K. Kowski, P. Rademacher, A. Fuss, R. Neuberger, H. Quast, P. Komnick, W. Sander
    4. Electronic Structure and Gas-Phase Thermolysis of 4-Substituted 3,3,5,5-Tetramethyl-3,5-dihydro-4H-pyrazoles Studied by Photoelectron Spectroscopy. First Evidence for an Alkylideneselenirane
    Tetrahedron, 1996, 52, 1965-1980

    221
    W. von der Saal, H. Quast
    Cyclopropanediamines. 6. Autocatalytic Conversion of 1-Methyl-r1,t-2-cyclopropanediamine into 4-Aminobutan-2-one in Aqueous Buffer Solutions of pH 6.5 - 10. Azomethine Ylides as Intermediates i n the Catalysis by Alkyl Ketones
    J. Org. Chem., 1996, 61, 4920-4928

    222
    H. Quast, C. Becker, M. Witzel, E.-M. Peters, K. Peters, H. G. von Schnering
    Synthesis and Structures of 2,6-Substituted Barbaralanes
    Liebigs Ann. Chem., 1996, 1541-1549

    223
    H. Quast, S. Ivanova, E.-M. Peters, K. Peters, H. G. von Schnering
    Ring Expansion of Heterocyclic Ketene N,X-Acetals and 2-Alkylidenedihydroindoles with Metanesulphonyl Azide by [3+2] Cycloaddition and Subsequent Extrusion of Molecular Nitrogen
    Liebigs Ann. Chem., 1996, 1541-1549

    224
    H. Quast, M. Ach, S. Ivanova,l K. Peters, H. G. von Schnering
    Zwitterions as Intermediates in 1,3-Dipolar Cycloadditions of Electrophilic Azides to 2-Alkylidenetetrahydroimidazoles and 2-Alkylidenedihydrobenzimidazoles
    Liebigs Ann. Chem., 1996, 1551-1558

    1997

    225
    H. Quast, J. Balthasar, A. Fuss, U. Nahr, W. Nüdling
    Photochemical Formation of Heteromethylenecyclopropanes, 27. Annulated Tetrazolium Salts
    Liebigs Ann. / Recueil, 1997, 671 - 683

    226
    H. Quast, C. Becker, E.-M. Peters, K. Peters, H. G. von Schnering
    A Novel Synthesis and the Autoxidation of 2,4,6,8-Tetraphenylbarbaralane
    Liebigs Ann. / Recueil, 1997, 685 - 698

    227
    H. Quast, C. Becker, E.-M. Peters, K. Peters, H. G. von Schnering
    An Attempted Synthesis of 2,6-Bis(phenylazo)barbaralane
    Liebigs Ann. / Recueil, 1997, 1733 - 1738

    1998

    228
    H. Quast, A. Fuß, W. Nüdling
    Photochemical Formation of Heteromethylenecyclopropanes, 28. Photoextrusion of Molecular Nitrogen from Annulated 5-Alkylidene-4,5-dihydro-1H-tetrazoles: Annulated Iminoaziridines and the First Triplet Diazatrimethylenemethane
    Eur. J. Org. Chem., 1998, 317 - 327

    229
    K. Peters, E.-M. Peters, W. Nüdling, H. Quast
    Crystal structure of 8,8'-(5,5',6,6',7,7',8,8'-octahydrobitetrazolo[1,5-a][1',5'-a'])bipyridine, (C5H7N4)2
    Z. Kristallogr. NCS, 1998, 213, 352

    230
    W. von der Saal, R. Reinhardt. J. Stawitz, H. Quast
    Cyclopropanediamines, 7. Pyrroles from 1,2-Cyclopropanediamines and Aldehydes
    Eur. J. Org. Chem., 1998, 1645 - 1652

    231
    H. Quast, M. Heubes, A. Dunger, H.-H. Limbach
    A High-Precision Carbon-13 Shift Thermometer for the Temperature Range 100 - 300 K
    J. Magn. Reson., 1998, 134, 236 - 244

    232
    L. M. Jackman, E. Fernandes, M. Heubes, H. Quast
    The Effects of Substituents on the Degenerate Cope Rearrangement of Semibullvalenes and Barbaralanes
    Eur. J. Org. Chem., 1998, 2209 - 2227

    233
    K. Peters, E.-M. Peters, M. Steinmetz, H. Quast
    Crystal structures of two diastereomeric 2,4-bis(-bromobenzyl)-1,5-diphenylpentane-1,5-diones, C5H6Br2(CO)2(C6H5)4
    Z. Kristallogr. NCS, 1998, 213, 596 - 598

    234
    K. Peters, E.-M. Peters, C. A. Klaubert, H. Quast
    Crystal structure of 1-trimethylsilyloxy-4,4-dimethylcyclohexane-r-1,t-3-dicarbonitrile, (CH3)2(CN)2[OSi(CH3)3]C6H7
    Z. Kristallogr. NCS, 1998, 213, 599 - 600

    235
    K. Peters, E.-M. Peters, C. A. Klaubert, H. Quast
    Crystal structure of 1-trimethylsilyloxy-3,5,5-trimethylcyclohexane-r-1,t-3-dicarbonitrile (CH3)3(CN)2[OSi(CH3)3]C6H6
    Z. Kristallogr. NCS, 1998, 213, 601 - 602

    236
    K. Peters, E.-M. Peters, C. Becker, H. Quast
    Crystal structure of 2,6-diphenylbicyclo[3.3.1]non-3-ene-2,6-diol, (C6H5)2C9H10(OH)2
    Z. Kristallogr. NCS, 1998, 213, 603 - 604

    237
    K. Peters, E.-M. Peters, K. L. Colson, L. M. Jackman, H. Quast
    Crystal structure of 9,9-dimethyl-10-(N-phenylimino)-9,10-dihydroanthracene, (CH3)2(C6H5N)C14H8
    Z. Kristallogr. NCS, 1998, 213, 605 - 606

    238
    K. Peters, E.-M. Peters, H. Quast
    Crystal structure of N-fluorenylideneaniline-benzene (4/1), 4[C13H8N(C6H5)] ú C6H6
    Z. Kristallogr. NCS, 1998, 213, 607 - 608

    239
    K. Peters, E.-M. Peters, R. Reinhardt, H. Quast
    Crystal structure of (1R*,7S*,9S*,15R*)-2,6,10,14-tetraazatricyclo[13.1.0.07,9]hexadeca-2,4,10,12-tetraene bis(hydrobromide), C12H16N4(HBr)2
    Z. Kristallogr. NCS, 1998, 213, 609 - 610

    240
    K. Peters, E.-M. Peters, R. Reinhardt, H. Quast
    Crystal structure of cis-N,Nï-bis(1-methyl-3-phenyl-1-propen-3-onyl)-1,2-cyclopropanediamine, C3H6N2(C10H9O)2
    Z. Kristallogr. NCS, 1998, 213, 701 - 702

    241
    K. Peters, E.-M. Peters, R. Reinhardt, H. Quast
    Crystal structure of 1,4,8,11-tetraaza-5,7,12,14-tetramethylcyclotetradeca-4,6,11,13-tetraene bis(hydroperchlorate), (C7H12N2)2(HClO4)2
    Z. Kristallogr. NCS, 1998, 213, 703 - 704

    242
    K. Peters, E.-M. Peters, D. Regnat, H. Quast
    Crystal structure of 1,4,9,9-tetramethyl-6-phenyl-1,2,3,4,6,7,8-heptaazaspiro[4.4]nona-2,7-diene, C12H17N7
    Z. Kristallogr. NCS, 1998, 213, 705 - 706

    243
    K. Peters, E.-M. Peters, M. L. Werner, H. Quast
    Crystal structure of (1S*, 7R*,10S*,16R*)-2,6,11,15-tetraazatricyclo[14.2.0.07,10]octadeca-2,4,11,13-tetraene bis(hydroperchlorate), (C7H10N2)2(HClO4)2
    Z. Kristallogr. NCS, 1998, 213, 707 - 708

    244
    K. Peters, E.-M. Peters, M. Ach, H. Quast
    Crystal strucure of N-methyl-N-(2-methylpropanoyl)-2-(N-methylamino)aniline, (C6H4NHCH3)N(CH3)(COC3H7)
    Z. Kristallogr. NCS, 1998, 213, 709 - 710

    245
    K. Peters, E.-M. Peters, M. Ach, H. Quast
    Crystal structure of 3,4-dihydro-2,2,4-trimethyl-3-(N-phenylimino)-2H-1,4-benzoxazine, (CH3)3(NC6H5)C8H4NO
    Z. Kristallogr. NCS, 1998, 213, 711 - 712

    246
    K. Peters, E.-M. Peters, T. Dietz, H. Quast
    Crystal structure of 1,5-dimethylbicyclo[3.3.0]octa-2,6-diene palladium dichloride, C10H14PdCl2
    Z. Kristallogr. NCS, 1998, 213, 713 - 714

    247
    K. Peters, E.-M. Peters, M. Witzel, H. Quast
    Crystal structure of 3-(phenylethinyl)-2-oxatricyclo[3.3.1.15,7]decan-1-ol. C9H12O(OH)(C2C6H5)
    Z. Kristallogr. NCS, 1998, 213, 715 - 716

    248
    K. Peters, E.-M. Peters, U. M. Doht, H. Quast
    Crystal structures of the diastereomeric 2-chloro-3-methyl-1-(2-methylphenyl)-1-phenyl-1-butenes, C4H4(C6H5)(C7H7)ClCH3
    Z. Kristallogr. NCS, 1998, 213, 717 - 719

    249
    K. Peters, E.-M. Peters, U. M. Doht, H. Quast
    Crystal structures of the diastereomeric 2-bromo-3-methyl-1-(2-methylphenyl)-1-phenyl-1-butenes, C4H4(C6H5)(C7H7)BrCH3
    Z. Kristallogr. NCS, 1998, 213, 720 - 722

    250
    K. Peters, E.-M. Peters, J. Balthasar, H. Quast
    Crystal structure of 2,4,6-tri-tert-butylphenylazide, (C4H9)3C6H2N3
    Z. Kristallogr. NCS, 1998, 213, 721 - 723

    1999

    251
    H. Quast, M. Heubes, T. Dietz, A. Witzel, M. Boenke, W. R. Roth
    Thermal Isomerisation of Substituted Semibullvalenes and Cyclooctatetraenes - A Kinetic Study
    Eur. J. Org. Chem., 1999, 813 - 822

    252
    H. Quast, M. Seefelder
    Das Gleichgewicht zwischen lokalisierten und delokalisierten Zuständen thermochromer Semibulvalene und Barbaralane - direkte Beobachtung von Übergangszuständen entarteter Cope-Umlagerungen
    Angew. Chem., 1999, 111, 1132 - 1136; Angew. Chem. Int. Ed., 1999, 38, 1064 - 1067

    253
    M. Seefelder. H. Quast
    Lösungsmitteleffekte auf das Gleichgewicht zwischen lokalisierten und delokalisierten Zuständen thermochromer Semibullvalene und Barbaralane
    Angew. Chem., 1999, 111, 1136 - 1139; Angew. Chem. Int. Ed., 1999, 38, 1068 - 1071

    254
    H. Quast, M. Seefelder, E.-M. Peters, K. Peters
    Synthesis, Crystal Structure, and Circular Dichroism Spectra of (1S)-4,8-Diphenylbarbaralane-2,6-dicarbonitrile - Chiroptical Properties of the Transition State of a Degenerate Cope Rearrangement
    Eur. J. Org. Chem., 1999, 1811 - 1823

    255
    H. Quast, M. Seefelder, C. Becker, M. Heubes, E.-M. Peters, K. Peters
    Extension of Saunders' Isotopic Pertubation Method as Probe for the Structures in Solution of 2,4,6,8-Substituted Barbaralanes - NMR Evidence for the Coexistence of Localised and Delocalised States
    Eur. J. Org. Chem., 1999, 2763-2779

    256
    K. Peters, E.-M. Peters, M. Seefelder, H. Quast
    Crystal structure of (Z,Z)-3,8-bis[1-(difluoroboryloxy)ethylidene]decane-2,9-dione, C10H14O2(C2H3OBF2)2
    Z. Kristallogr. NCS, 1999, 214, 537-538

    257
    H. Quast, M. Seefelder, S. Ivanova, M. Heubes, E.-M. Peters, K. Peters
    Tetraacylethenes as Dienophiles and Hetero Dienes in Twostep Diels-Alder Reactions
    Eur. J. Org. Chem., 1999, 3343-3351

    2000

    258
    W. Sander, R. Wrobel, P. Komnick, P. Rademacher, H. M. Muchall, H. Quast
    Flash Vacuum Pyrolysis and Photolysis of 3,3,5,5-Tetramethylpyrazolin-4-one - a Matrix Isolation Study
    Eur. J. Org. Chem., 2000, 91-98

    259
    H. Quast, S. Ivanova, E.-M. Peters K. Peters
    Ring Expansion of 2-Alkylidenedihydroquinolines to 2-Iminodihydro-1-benzazepines by Phenyl, Methanesulphonyl, and Trifluoromethanesulphonyl Azide
    Eur. J. Org. Chem., 2000, 507-520

    260
    H. Quast, S. Ivanova
    Ring Expansion vs. Cleavage of the Exocyclic Double Bond of 2-Cycloalkylidenedihydrobenzothiazoles and -benzimidazoles by Methanesulphonyl Azide
    Eur. J. Org. Chem., 2000, 1229-1233

    261
    K. Peters, E.-M. Peters, T. Dietz, H. Quast
    Crystal structure of 3-ethyl-7,10-dimethyl-2-azatricyclo[5.2.1.04,10]deca-2,5,8-triene-N- tungsten(0)-pentacarbonyl
    Z. Kristallogr. NCS, 2000, 215, 43-44

    262
    H. Quast, S. Ivanova, E.-M. Peters, K. Peters
    Ring Expansion of 2-Alkylidenedihydroquinazolines to Iminodihydro-1,4-benzodiazepines by Methanesulphonyl and Trifluoromethanesulphonyl Azide
    Eur. J. Org. Chem., 2000, 1577-1587

    263
    K. Peters, E.-M. Peters, K.-H. Ross, E. Spiegel, H. Quast
    Crystal structure of hexamethyl[1,3-dimethyl-2,3-dihydro-1H-imidazole]-2-spiro-4'-[1'-tert-butyl-1,',4'-dihydropyridine]-4,5,2'3'5'6'-hexacarboxylate, C25H33N3O12
    Z. Kristallogr. NCS, 2000, 215, 291-292

    264
    K. Peters, E.-M. Peters, T. Hergenröther, H. Quast
    Crystal structure of 3-methylamino-2,2,-diphenyl-2H-azirine, (HNCH3)C2N(C6H5)2
    Z. Kristallogr. NCS, 2000, 215, 303-304

    265
    K. Peters, E.-M. Peters, A. Witzel, H. Quast
    Crystal structure of 4,8-dimethyl-3,7-diphenylcycloocta-1,3,5,7-tetraene-1,5-dicarbonitrile, C8H2(C6H5)2(CH3)2(CN)2
    Z. Kristallogr. NCS, 2000, 215, 295-296

    266
    K. Peters, E.-M. Peters, A. Witzel, H. Quast
    Crystal structure of 2,6-dimethyl-3,7-diphenylcycloocta-1,3,5,7-tetraene-1,5-dicarbonitrile, C8H2(C6H5)2(CH3)2(CN)2
    Z. Kristallogr. NCS, 2000, 215, 293-294

    267
    K. Peters, E.-M. Peters, M. Ach, H. Quast
    Crystal structure of 4,5,2',3'-tetrahydro-4-(1,1-dimethylethyl)-1,1',3'-trimethylspiro{[1H][1,2,3]-triazole-5,2'-benzimidazole}
    Z. Kristallogr. NCS, 2000, 215, 297-298

    268
    K. Peters, E.-M. Peters, M. Ach, H. Quast
    Crystal structure of 4,5,2',3'-tetrahydro-4,4,1',3'-tetramethyl-1-phenylspiro{[1H][1,2,3]-triazole-5,2'-[1H]-perimidine}
    Z. Kristallogr. NCS, 2000, 215, 299-300

    269
    K. Peters, E.-M. Peters, M. Ach, H. Quast
    Crystal structure of 1,3-dimethyl-2-[methyl-1-(3-methyl-1-triazeno)ethyl]benzimidazolium hexafluorophosphate [C7H4N2C(CH3)2C(CH3)2N3HCH3]+ [PF6]-
    Z. Kristallogr. NCS, 2000, 215, 301-302

    270
    A. Benesi, R. Bertermann, H. Förster, M. Heubes, L. M. Jackman, T. Koritsansky, P. Luger, A. Mayer, H. Quast, M. Seefeld
    Perturbation of Degeneracy of the Cope Rearrangement by the Crystal Lattice of the ß-Form of 1,5-Dimethylsemibullvalene-2,6-dicarbonitrile as Studied by Variable- Temperature Solid-State Carbon-13-Spectroscopy and X-Ray Crystallography at Cryogenic Temperatures
    J. Am. Chem. Soc., 2000, 122, 4455-4463

    271
    K. Peters, E.-M. Peters, J. Grimme, H. Quast
    Crystal structure of trans-1,4,7,10-tertakis[2,2-dimethylpropyloxy)-5,6,11,12-terahydro-5,12[1',2']6,11[1'',2'']dibenzenodibenzo[a,e]cyclooctatetraene [C14H8(C5H11O)2]2
    Z. Kristallogr. NCS, 2000, 215, 307-308

    272
    K. Peters, E.-M. Peters, J. Balthasar, H. Quast
    Crystal structure of 4,5,2',3'-tetrahydro-4,4,1'3'-tetramethyl-1-(2-nitrophenyl)spiro{[1H][1,2,3]-triazole-5,2'benzimidazole}
    Z. Kristallogr. NCS, 2000, 215, 387-388

    273
    K. Peters, E.-M. Peters, G. Philipp, H. Quast
    Crystal structure of 1,6,-di-tert-butyl-2-(N-tert-butylimino)-4,7a-dimethyl-2,7a-dihydro-1H-benzimidaole
    Z. Kristallogr. NCS, 2000, 215, 305-306

    274
    K. Peters, E.-M. Peters, G. Philipp, H. Quast
    Crystal structure of (E)-2,5-di-tert-butyl-3-(N-tert-butylimino)-2,3-dihydroindazyl C7H3N2(NC4H9)(C4H9)2
    Z. Kristallogr. NCS, 2000, 215, 385-386

    2001

    275
    M. Heubes, T. Dietz, H. Quast, M. Seefelder, A. Witzel, V. R. Gadgil, R. V. Williams
    Lifting of the Degeneracy in Semibullvalenes by Remote and Direct Substituents: A Quantitative Study Using Variable-Temperature Carbon-13 NMR Spectroscopy
    J. Org. Chem., 2001, 66, 1949-1960

    276
    H. Ihmels, C. J. Mohrschladt, J. W. Grimme, H. Quast
    Regioselectivity of the Di-pi-Methane Rearrangements of 1,4-Dialkoxy-9,10-bis(methoxycarbonyl)dibenzobarrelenes in Solution and in the Solid State
    Synthesis, 2001, 1175-1180

    2002

    277
    K. Banert, J. Lehmann, H. Quast, G. Meichsner, D. Regnat, B. Seiferling
    15N NMR spectra, tautomerism and diastereomerism of 4,5-dihydro-1H-1,2,3-triazoles
    J. Chem. Soc., Perkin Trans. 2, 2002, 126-134

    278
    A. C. Goren, D. A. Hrovat, M. Seefelder, H. Quast, W. T. Borden
    The Search for Bishomoaromatic Semibullvalenes and Barbaralanes. Computational Evidence of their Identification by UV/Vis and IR Spectroscopy and Prediction of the Existence of a Blue Bishomoaromatic Semibullvalene
    J. Am. Chem. Soc., 2002, 124, 3469-3472

    2003

    279
    E.-U. Würthwein, T. Hergenröther, H. Quast
    Exo/endo Preferences of Double Bonds in Three-membered Ring Compounds. - The Bias toward Endocyclic Unsaturation in 3-Alkyl- and 3-Amino-2H-azirines: A Theoretical and Experimental Study
    Eur. J. Org. Chem., 2002, 1750-1755; corrigendum 2003

    2005

    280
    D. A. Hrovat, E. C. Brown, R. V. Williams, H. Quast, W. T. Borden
    How Important Is Bishomoaromatic Stabilization in Determining the Relative Barrier Heights for the Degenerate Cope Rearrangements of Semibullvalene, Barbaralane, Bullvalene, and Dihydrobullvalene?
    J. Org. Chem., 2005, 70, 2627-2632

    281
    M. Seefelder, M. Heubes, H. Quast, W. D. Edwards, J. A. Armantrout, R. V. Williams, C. J. Cramer, A. C. Goren, D. A. Hrovat, W. T. Borden
    Experimental and Theoretical Study of Stabilization of Delocalized Forms of Semibullvalenes and Barbaralanes by Dipolar and Polarizable Solvents. Observation of a Delocalized Structure that Is Lower in Free Energy than the Localized Form.
    J. Org. Chem., 2005, 70, 3437-3449

    282
    H. Quast, M. Ach, J. Balthasar, T. Hergenröther, D. Regnat, J. Lehmann, K. Banert
    Exploring the Border Between Concerted and Two-Step Pathways of 1,3-Dipolar Cycloadditions of Organic Azides to Cyclic Ketene N,X-Acetals. - Synthesis and 15N –NMR Spectra of Zwitterions and Spirocyclic Cycloadducts.
    Helv. Chim. Acta, 2005, 88, 1589-1609

    283
    H. Quast, M. Ach, D. Regnat
    Triazenes by Acid-Mediated Opening of the Dihydro-1,2,3-triazole Ring of 1,3-Dipolar Cycloadducts of Organic Azides to Cyclic Ketene N,N-Acetals.
    Eur. J. Org. Chem., 2005, 4441-4447

    2006

    284
    H. Quast, M. Ach, T. Hergenröther, D. Regnat
    5-Alkylamino-1H-1,2,3-triazoles by Base-Mediated Cleavage of Cycloadducts of Azides to Cyclic Ketene N,N-Acetals.
    Synthesis, 2006, 1943-1945

    2007

    285
    H. Quast, S. Aldenkortt, B. Freudenreich, P. Schäfer, M. Hagedorn, J. Lehmann, K. Banert
    Synthesis, Configuration, and 15N NMR Spectra of Iminoaziridines. - Synthons Equivalent to Three Components of the Ugi Reaction.
    J. Org. Chem., 2007, 72, 1659-1666

    2008

    286
    H. Quast, L. W. Bieber
    Iminodiaziridines by Regio- and Stereoselective Cyclization of Diastereomeric Singlet Triazatrimethylenemethane Diradicals Generated Through Photolysis of 5-Imino-4,5-dihydro-1H-tetrazoles.
    J. Org. Chem., 2008, 73, 3738-3744

    287
    H. Quast, W. Nüdling, G. Klemm, A. Kirschfeld, P. Neuhaus, W. Sander, D. A. Hrovat, W. T. Borden
    A Perimidine-Derived Non-Kekule Triplet Diradical.
    J. Org. Chem., 2008, 73, 4956-4961

    2009

    288
    H. Dong, D. A. Hrovat, H. Quast, W. T. Borden
    Calculations of the Relative Energies of the Low-Lying Electronic States of 2-Methylenedihydrophenalene-1,3-diyl: Effects of a 1,8-Naphtho Bridging Group on Trimethylenemethane and of a Vinylidene Bridging Group on 1,8-Naphthoquinodimethane.
    J. Phys. Chem. A, 2009, 113, 895-901

    289
    H. Quast, K.-H. Ross, G. Philipp, M. Hagedorn, H. Hahn, K. Banert
    Syntheses and 15N NMR Spectra of Iminodiaziridines Ring Expansions of 1-Aryl-3-iminodiaziridines to 1H- and 3aH-Benzimidazoles, 2H-Indazoles, and 5H-Dibenzo[d,f][1,3]diazepines.
    Eur. J. Org. Chem., 2009, 3940-3952

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