Article révisé par les pairs
Résumé : Two asymmetric photosyntheses of a [6] helicene skeleton, induced by (‐) menthyl esters, have been studied (Ia–IIa and Ib–IIb). The optical yield of the two reactions is of the same magnitude (5‐6%), but the substituted helicenes produced in excess have opposite configurations. Copyright © 1975 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim