Photochemistry with circularly polarized light—III : Synthesis of helicenes using bis(arylvinyl) arenes as precursors

Abstract

A systematic study of the photochemical ring-closure of bis(arylvinyl)arenes, using circularly polarized light, is described and commented. In the two series of compounds 5a– e and 6a– e, the observed optical yields follow a similar trend; no asymmetric syntheses were observed in the case of the higher benzologues of [10] helicene, using a 290–370 nm irradiation band, circularly polarized at 313 nm.