Abstract
Heterohelicenes refer to ortho-condensed aromatic compounds in which heteroaromatic and benzene rings are angularly annulated such as to give helically shaped molecules. Since the first heterohelicene, dithia [6] heterohelicene, was synthesized by means of oxidative photocyclization of diarylethylene in 1968, its homologues up to [11] heterohelicene have been already reported. These molecules are asymmetric chromophores themselves and manifest the interesting structural, spectral and optical behaviors.
This paper describes the studies of heterohelicenes on their preparations, reactions, structures, optical resolutions, racemizations and spectroscopies (NMR, UV, ORD, CD and MS).
