Publikationen

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[13.1.0.0^7,9]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[14.2.0.0^7,10]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[3.3.1.1^5,7]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[5.2.1.0^4,10]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