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Abstract
Phosphorylation of guanidines and alkanediyldiguanidines by a two-phase reaction gave asymmetric (I) and symmetric (III) organophosphorus compounds containing 1-phosphoryl-3-imino group. Structural analyses carried out by IR and NMR coupling/decoupling spectroscopy. Temperature dependence studies showed the presence of intramoleuclar hydrogen bonding of the developed system, the influence of steric effect on the tautomerism of the system was also investigated.