Attempts to distil dialkyl phosphoroisoseleno-cyanatidite (V) caused its rearrangement to dialkyl cyanophosphoroselenoate (VIII), and treatment of (V) with the phosphinite (VI) gives dialkyl phosphorocyanidite (IV); these observations indicate the thermodynamic instability of the intermediate dialkyl phosphoroisocyanidite (III), which has not been identified by physical methods but is supported by the proposed reaction mechanism.
W. J. Stec, T. Sudol and B. Uznański, J. Chem. Soc., Chem. Commun., 1975, 467 DOI: 10.1039/C39750000467
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