Nuclear magnetic resonance investigations of boron compounds. Part 15. Some derivatives of a triazaphosphadiborine and a triazaphosphaborolidine

Abstract

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.