BERNHARD, W.;BUUEGGER, P.;DALY, J. J.;SCHOENHOLZER, P.;WEBER, R. H.;HANSE+, HELV. CHIM. ACTA, 1985, 68, N 2, 415-428
作者:BERNHARD, W.、BUUEGGER, P.、DALY, J. J.、SCHOENHOLZER, P.、WEBER, R. H.、HANSE+
DOI:——
日期:——
WEBER, ROLAND H.;BRUGGER, PAUL;ARNOLD, WOLF;SCHONHOLZER, PETER;HANSEN, HA+, HELV. CHIM. ACTA, 70,(1987) N 6, 1439-1460
作者:WEBER, ROLAND H.、BRUGGER, PAUL、ARNOLD, WOLF、SCHONHOLZER, PETER、HANSEN, HA+
DOI:——
日期:——
WEBER R. H.; BRUGGER P.; JENNY T. A.; HANSEN H. -J., HELV. CHIM. ACTA, 70,(1987) N 3, 742-759
作者:WEBER R. H.、 BRUGGER P.、 JENNY T. A.、 HANSEN H. -J.
DOI:——
日期:——
Formation of Cyclic ‘<i>ortho</i>’-Anhydrides of Heptalene-1,2-dicarboxylic Acids
作者:Roland H. Weber、Paul Brügger、Wolf Arnold、Peter Schönholzer、Hans-Jürgen Hansen
DOI:10.1002/hlca.19870700602
日期:1987.9.23
oxylic acids as well as 2-(alkoxycarbonyl)heptalene-1-carboxylic acids react with the iminium salt formed from N,N-dimethylformamide (DMF) and oxalyl chloride, in the presence of an alcohol, to yield the corresponding cyclic ‘ortho’ -anhydrides (ψ-esters; cf. Schemes 2,3,6, and 8). When the alkoxy moiety of the acids and the alcohols is different, then diastereoisomeric ‘ortho’ -anhydrides are formed
First Optically Active Heptalenes and their Absolute Configuration
作者:Werner Bernhard、Paul Brügger、John J. Daly、Peter Schönholzer、Roland H. Weber、Hans-Jürgen Hansen
DOI:10.1002/hlca.19850680215
日期:1985.3.27
7-isopropyl-5, 10-dimethylheptalene-1, 2-dicarboxylate (1) and dimethyl 5, 6, 8, 10-tetramethylheptalene-1, 2-dicarboxylate (2) can be resolved via the corresponding mono-acids and with the aid of opticallyactive primary or secondary amines such as 1-phenylethylamine or ephedrine into the (−)-(P)- and (+)-(M)-enantiomeres, respectively. Characteristic for the (P)-chirality of the heptalene π-skeleton with