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The structure of novel phosphorus-containing N-vinylazoles prepared by action of phosphorus pentachloride has been studied by multinuclear (1)H, (13)C, (15)N, (31)P and two-dimensional (2D) NMR spectroscopy. N-vinyl-substituted 1,2-diazoles and 1,2,3-triazoles have undergone phosphorylation, exclusively, on double bond. N-vinylazoles-based hexa-coordinated phosphorus compounds have been synthesized for the first time. (31)P NMR spectroscopy provides the most convenient and unambiguous method for the investigation of E-Z-isomeric structures of phosphorylated enamines.
Reaction of N,N'‐dimethylurea (I) with the acyl chlorides (II) yields the N‐acyl‐N,N'‐dimethylureas (III) which are coupled with PCl5 (IV), forming the cyclic phosphonium salts (V).
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