Article révisé par les pairs
Résumé : Epoxidation of (E)‐stilbene and α‐methylstyrene has been carried out using the (dl) nitriles 1, 2 and 3 in the presence of 98% H2O2. Chemical yields are collected in tables I and II (75–87%). The enantioselective epoxidation of the same substrates has been carried out using optically active 2‐cyano‐heptahelicene 4. Good chemical yields [(E)‐stilbene 92% and α‐methylstyrene 84%] and enantiomeric excesses [(E)‐stilbene 99.8%±2 and α‐methylstyrene 97.6%±2] have been obtained. Copyright © 1986 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim