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| 1. |
Zeugnisse aus der Gründungszeit des ersten Chemischen Laboratoriums der Berliner Universität gefunden am 13 September 1988 |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 193-196
Dieter Hass,
Dieter Kreysig,
Monika Donke‐Müller,
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摘要:
AbstractDuring building and reconstruction activities in the center of Berlin was found a casket made of sheet zinc which was deposited in the foundation wall of the former IrstChemical Laboratory of the University of Berlin in the Georgen‐Street. This casket and its content documents the laying of the foundation stone of the building by A. W.Hofmann in 1865. In the casket were found the charter of the IrstChemical Laboratory, photos showing A. W. Hofmann, C. A. Martins and E. Sell, the register of the staff and samples of synthesized dyes. This find is very important with respect to the history of chemistry at the University of Berlin and with view on the 100th anniversary of A. W. Hofmann's death 1992 which will be celebrated by an international conference in Berlin at Humboldt‐University common with the Academy of Science and the Chemical Society of G.
ISSN:0044-2402
DOI:10.1002/zfch.19890290602
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 2. |
Rotationsbarrieren exocyclischer, partieller C,N‐Doppelbindungen in aromatischen Verbindungen — Indikatoren der n,π‐Mesomerie |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 196-203
Erich Kleinpeter,
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摘要:
AbstractThe rotational barriers about the exocyclic partial C,N‐double bonds of dimethylamino‐substituted aromatic π‐electron systems, studied so far, have been discussed with respect to the degree of n,π‐mesomerism of the dimethylamino substituent (n‐electrons) and the aromatic system (π‐electrons). Hereby, the possibility arises to estimate the π‐electron deficiency of the heteroaromatic systems studied if the dimethylamino substituent is hold constant. Relevant influences of steric hindrance, of heteroatoms involved, of one positive charge in the aromatic spezies, of further substituents on the same ring system and of the solvent on the dynamic process studied were considered. The parallelism of the rotational barriers to other useful parameters to classify the present degree of n,π‐mesomerisms (1H,13C and15N chemical shifts, Hammett substituent constants. C,H coupling constants) is critically estimated.Additionally, special barrier (and adequately the chemistry) determining substructures (vinylogous amides and thioamides, tri‐ and pentamethine cyanine
ISSN:0044-2402
DOI:10.1002/zfch.19890290603
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 3. |
Darstellung von N‐(2‐nitrophenyl)‐N′‐substituierten Sulfurylamidenund Sulfamidsäurearylestern |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 203-204
Frank Pätzold,
Hans‐Joachim Niclas,
Hans‐Jürgen Förster,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290604
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 4. |
Eine neue Variante zur Synthese von 1‐Aryl‐3‐acyl‐harnstoffen |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 204-205
Monika Bichter,
Wolfgang Richter,
Manfred Pallas,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290605
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 5. |
Oxidation des 2‐Hydrazino‐4,5‐diphenyl‐selenazols |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 205-206
Ehrenfried Bulka,
Anke Kohler,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290606
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 6. |
Umsetzung des Thiazole[3,2‐a]benzimidazol‐3‐ons mit Elektrophilen |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 206-207
Manfred Augustin,
Wolfgang Dölling,
Dorothea Elias,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290607
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 7. |
Radikalische Substitution von Kronenethern durch 2‐Methylchinolin |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 207-208
Juri B. Zelečonok,
Valeri V. Zorin,
Ludmila P. Ivanova,
Semen S. Zlotskij,
Diljus L. Rachmankulov,
Hans‐Joachim Timpe,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290608
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 8. |
Eine einfache Methode zur regioselektiven Reduktion von carbonylsubstituierten Chinoxalin‐1,4‐dioxiden |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 208-209
Gerhard Stumm,
Hans‐Joachim Niclas,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290609
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 9. |
Über die Synthese von 3′‐Desoxy‐3′‐fluoradenosin durch chemische Transglykosidierung |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 209-210
Andrea Neumann,
Dieter Cech,
Frank Schubert,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290610
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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| 10. |
Zu Struktur‐Aktivitäts‐Aspekten von Substanz P und der Tachykininfamilie |
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Zeitschrift für Chemie,
Volume 29,
Issue 6,
1989,
Page 210-211
Siegfried Hoffmann,
Claus Liebmann,
Peter Mentz,
Klaus Neubert,
Alfred Barth,
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ISSN:0044-2402
DOI:10.1002/zfch.19890290611
出版商:Wiley‐VCH Verlag GmbH&Co. KGaA
年代:1989
数据来源: WILEY
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