Abstract
An unusual greater reactivity of phosphonous propionic acids was found in comparison with phosphonous propionic esters in carbamate version of Kabachnik-Fields reaction. Compounds of tricoordinated phosphorus generated in situ during the amidoalkylation of hydrophosphorylic compounds in acetyl chloride/acetic anhydride mixture were found by 31P NMR analysis. A hypothesis is proposed about the generation of spirophosphoranes in situ to explain the mechanism for the formation of the phosphorus-carbon bond in the reaction under study.
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