Wittig rearrangements of allyl vinylcyclopropylmethyl ethers

Abstract
Anions derived from allyl vinylcyclopropyl-methyl ethers (2) rearrange by competing [1,2], [1,4], homo [2,5], and homo [4,5] sigmatropic changes to give allylic alcohols (4) and (9) and aldehydes (5) and (6); the hydrocarbon (8) results from a radical dissociation-recombination process.

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