Abstract
AbstractThe discovery of dichotomous reactivity in the reaction of trialkyl‐ vs. triphenylphosphane HBr salts with acetals allows entry to functionalized α‐methoxy phosphonium salts and a novel process for tertiary phosphane methylation. The new protocol opens a general entry to the synthesis of vinyl ethers and differentially substituted 1,3‐dienes via Wittig reactions of the functionalized ylides derived from the α‐methoxy phosphonium salts.
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