Df. Schneider et Ac. Venter, Synthetic potential of the reaction of allylic phosphonium ylides with alpha,beta-unsaturated carbonyl compounds, SYN COMMUN, 29(8), 1999, pp. 1303-1315
The reaction of triphenylphosphonium-2-propenylide (14) with mesityl oxide
(9) is shown to proceed via initial Michael addition followed by transylida
tion and an intramolecular Wittig condensation to yield I,5,5-trimethyl-1,3
-cyclohexadiene (10) as the reaction product.