chapter  3
48 Pages

Photocycloadditions with Captodative Alkenes

An alkene 1. hearing both an electron donor d and an electron acceptor c at one terminus of the double bond, may he termed a captodativc alkene. Addition of a radical R to its double bond will occur strictly rcgioselcctivcly at the unsub-


stituted terminus and generate a captodatively (c,d)-stabilized adduct radical 2 [I] (Scheme 1).