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A 1:1 reaction of (HOCH2)3P with the cinnamic acids ArCH=CHCO2H (Ar = Ph, o‐ and p‐C6H4OH) in acetone at 60 °C affords a phosphobetaine of the type (HOCH2)3P+CH(Ar)CH2CO2– in 70–80 % yields; the products were characterized by 31P{1H}‐, 1H‐, and 13C{1H}‐NMR spectroscopy, and mass spectrometry. In methanol, the compounds decompose partially to a tertiary phosphine of the type (HOCH2)2PCH(Ar)CH2CO2H;...
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