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The base-catalyzed reaction of vinylphosphonium salts with compounds containing replaceable hydrogen introduces a 2-substituted ethylphosphonium group. This reaction is called phosphonioethylation. Addition to tributylvinylphosphonium bromide of compounds containing -CH, -NH, -PH, -OH, and -SH has been carried out. Other vinylphosphonium salts react similarly. Diels-Alder addition of cyclopentadiene and brom ¡nation also have been observed. The adduct with isobutyrophenone undergoes intramolecular cyclization in the presence of base to give a cyclobutenylphosphonium salt. Michael addition to allylphosphonium salts has been investigated.

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