Abstract
Abstract The vinylphosphonium salts 2. obtained from allenyl compounds 1. are phosphorus synthetic equivalents of γ functionalized allylic carbocations. Nucleophilic addition reactions give polyfunctional phosphonium salts, useful starting materials for further investigations. As a function of the basicity of the nucleophile, the addition reaction is in competition with elimination of the phosphorus group in 2, leading to reformation of the allenic starting material 1.
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