In the present review we attempt to systematize and generalize the available data on prototropy in imidoylphosphonates containing α-hydrogen atoms in the N- or C-alkyl groups of the C=N bond. Prototropic transitions in C=N-CH triad of imidoylphosphonates leading to biorelevant α-aminophosphonates are in main focus of the review. Central to this endeavour is elucidation of the effect that the phosphoryl or phosphonium moiety exerts on prototropy in the phosphorylated 2-azaallylic triad.
Keywords: imidoylphosphonates, imidoyl chlorides, aminophosphonates, proton transfer, stereoselectivity, rearrangements
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