N.m.r. parameters (1H, 11B, 13C, and 31P) of a triazaphosphadiborine and a triazaphosphaborolidine and their corresponding ‘phosphinylium’ cations have been measured. The geminal 31P–13C coupling constants are consistent with non-planarity of the ring systems, this non-planarity being greater in the neutral than in the cationic species. Values of 3J(31PNCH) are less sensitive to changes in ring conformation and therefore must be used with care to assess this unless independent evidence is available.
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Journal of the Chemical Society, Dalton Transactions
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