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The reaction of triphenylphosphonium-2-propenylide (14) with mesityl oxide (9) is shown to proceed via initial Michael addition followed by trans ylidation and an intramolecular Wittig condensation to yield 1, 5, 5-trimethyl-1, 3-cyclohexadiene (10) as the reaction product.

The reaction of triphenylphosphonium-2-propenylide (14) with mesityl oxide (9) is shown to proceed via initial Michael addition followed by trans ylidation and an intramolecular Wittig condensation to yield 1, 5, 5-trimethyl-1, 3-cyclohexadiene (10) as the reaction product.

The interaction of triphenylphosphonium-2-propenylide (2) with prenal (6) is shown to proceed via initial Cγ-C1 addition, followed by dissociation of the coupling product and Cα-C1 recombination to produce the corresponding betaine, which eliminates triphenyphosphine oxide to yield (E)- and (Z)-6-methyl-1,3,5-triene (7a,b) as the Wittig olefination products.