Carboncarbon bond formation by radical addition–fragmentation reactions of O-tert-alkyl enols and O-cyclopropylcarbinyl enols

Terminal alkenes of the type H2CC(OR1)X, in which R1 is a tertiary alkyl or a 1-cyclopropylethyl group and X=Ph, OSiMe2But, OEt or H, undergo radical-chain reactions with organic halides R2Hal to give carbonyl compounds R2CH2C(O)X.