The formation of 2-substituted diphenyl-1-phenylethylphosphine oxides from phosphonium betaines, vinylphosphonium salts, or from the reactions of triphenylphosphine with acetylenes and water have been shown to proceed via 2-substituted triphenylvinylphosphonium hydroxides.
E. M. Richards and J. C. Tebby, J. Chem. Soc. D, 1969, 494 DOI: 10.1039/C29690000494
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