Abstract A simple, efficient two-step synthesis of hexahelicenes 1 and 2 is described. The preparation of the new diene 3 and its Diels-Alder cycloaddition with 2-inden-1-one is discussed.
DIESVELD, J. W.;BORKENT, J. H.;LAARHOVEN, W. H., TETRAHEDRON, 1982, 38, N 12, 1803-1808
作者:DIESVELD, J. W.、BORKENT, J. H.、LAARHOVEN, W. H.
DOI:——
日期:——
Conformational studies of helicenes—VIII1
作者:J.W. Diesveld、J.H. Borkent、W.H. Laarhoven
DOI:10.1016/0040-4020(82)80254-8
日期:1982.1
Phenanthro[3,4-c]fluorenone (5) and phenanthro[3,4-c]fluorene (1) have been prepared from hexahelicene-5,6-quinone. The effect of the presence of a five-membered ring on the helical conformation has been studied by comparison of NMR data of 1 and 5 with those of hexahelicene. Force field calculations of the structure of 1 agree with the results of the NMR analysis.