Zobrazeno 1 - 10
of 79
pro vyhledávání: '"Heinz Dehne"'
Autor:
Manfred Michalik, Helmut Reinke, Heinz Dehne, Kerstin Drexler, Anke Scheunemann, Klaus Martens
Publikováno v:
Molecules, Vol 6, Iss 6, Pp 540-550 (2001)
The new S-alkyl thiooxal-1-hydrazono-2-amidrazonium halides 2-4 were synthesized by reaction of the corresponding zwitterionic thiooxalic acid derivatives 1 with alkyl halides in methanol. The structures of compounds 4b and 4d were proven by X-ray st
Externí odkaz:
https://doaj.org/article/e90f7d549b6348be97de61205c67325f
Autor:
Wolfgang Weissflog, Siegmar Sokolowski, Heinz Dehne, Banani Das, Siegbert Grande, Martin W. Schröder, Alexey Eremin, Siegmar Diele, Gerhard Pelzl, Horst Kresse
Publikováno v:
Liquid Crystals. 31:923-933
Two new homologous series of bent-core compounds have been synthesized. Their mesophase behaviour has been investigated by polarizing microscopy, differential scanning calorimetry, X-ray diffraction, NMR spectroscopy, and by dielectric and electro-op
Autor:
Vladimir V. Ovcharenko, Zora Šusteková, Kalevi Pihlaja, Walter M. F. Fabian, Heinz Dehne, Katri Laihia, Joachim Teller, Marion Kleist, Erkki Kolehmainen, Alexander Perjéssy
Publikováno v:
Journal of the Chemical Society, Perkin Transactions 2. :329-336
Sixteen 4-arylthiazol-2(3H)-ones (3) were synthesised by cyclisation of α-thiocyanatoacetophenones (1) in acid solution. They appear to prefer greatly the oxo tautomeric forms. In CCl4 solution an equilibrium between the free CO bond and a “dimeri
Autor:
Heinz Dehne, Alexander Perjéssy, Siegmar Sokolowski, Zora Šusteková, Quing Liu, M. Samalikova, Václav Konečný, Dusan Loos
Publikováno v:
Collection of Czechoslovak Chemical Communications. 67:1790-1804
Infrared spectra for a series of 2-substituted 4,5-dimethoxypyridazin-3(2H)-ones (1) were measured in hexane (n-C6H14)-CHCl3 and CH3CN-D2O binary mixtures. The solute-solvent interactions of pyridazinones 1 were studied by correlation of v(C=O) value
Autor:
Wolfgang Weissflog, Horst Kresse, Heinz Dehne, Siegmar Diele, Gerhard Pelzl, H. Schmalfuss, I. Wirth, Siegmar Sokolowski, S. Grande, M. Pötter
Publikováno v:
Liquid Crystals. 28:1269-1277
Banana-shaped five-ring mesogens derived from either isophthalic acid or 4-bromoisophthalic acid have been synthesized. It is shown that the melting and clearing points of the bromine-substituted compounds are markedly decreased in comparison with th
Autor:
Kerstin Drexler, Klaus Martens, Helmut Reinke, Manfred Michalik, Anke Scheunemann, Heinz Dehne
Publikováno v:
Molecules
Volume 6
Issue 6
Pages 540-550
Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry
Molecules, Vol 6, Iss 6, Pp 540-550 (2001)
Volume 6
Issue 6
Pages 540-550
Molecules : A Journal of Synthetic Chemistry and Natural Product Chemistry
Molecules, Vol 6, Iss 6, Pp 540-550 (2001)
The new S-alkyl thiooxal-1-hydrazono-2-amidrazonium halides 2-4 were synthesized by reaction of the corresponding zwitterionic thiooxalic acid derivatives 1 with alkyl halides in methanol. The structures of compounds 4b and 4d were proven by X-ray st
Autor:
Manfred Süße, Heinz Dehne
Publikováno v:
Zeitschrift für Chemie. 15:268-270
Publikováno v:
Phosphorus, Sulfur, and Silicon and the Related Elements. 139:123-145
The synthesis of trans 5-aroyl-3,4-diarylthiazolidine-2-iminium chlorides 2 or trans 2-aroyl-1-aryl-1,2-dihydro-thiazolo[3,2-a]quinazoline-5-ones 3 by treatment of threo 1,3-diary-3-arylamino-2-thiocyanatopropanones 1 with dry hydrogen chloride is de
Publikováno v:
Scopus-Elsevier
Low-molecular-weight compounds often crystallizes to systems with 100% crystallinity. There are only a few examples where a small amorphous fraction, characterized by a glass transition, remains after long time crystallization from the melt. The crys
Publikováno v:
Scopus-Elsevier
The esters of 2,5-bis(2-carboxy-phenylthio)terephthalic acid 4a-f were prepared by reaction of 2,5-bis(2-carboxy-phenylthio)terephthalic acid 2 via chloride 3 with alcohols or phenols. These novel glass-forming compounds are of the sulfur ligated “