Reactions of C,N-diphosphorylated dichlorovinyl amides with primary amines lead to the respective 2,2diaminovinylphosphonates. The latter undergo phosphoro-and prototropic rearrangements under heating to give diphosphorylated amidines. N-Sulfonyl iminophosphonates are converted into the corresponding Nphosphonyl iminophosphonates by reaction with diethyltrimethylsilylphosphite. The reaction of the latter with phosphonylimino trifluoropyruvate leads to the reduction of the C=N bond. Trimethylsilyl chloride mediated rearrangement of geminal amidobisphosphonates yields N-phosphonyl iminophosphonates.
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