Abstract
The data on prototropy in imidoylphosphonates containing α-hydrogen atoms in the N-alkyl group of the C˭N bond were systematized and generalized. Imidoylphosphonates-alkylideneaminophosphonates interconversions via biomimetic transamination reaction are in main focus of the review. Central to this endeavor is the elucidation of the effect that the phosphonyl moiety exerts on prototropy in the phosphorylated 2-azaallylic triad.