Boron‐Nitrogen Compounds 83 [1]. Experimental and Theoretical Studies on Monomeric Iminoboranes

Abstract

Nuclear magnetic resonance and vibrational spectroscopic data support the existence of liner CNB skeleton in monomeric iminoboranes of the type R2CNBR 2′. This allene‐like arrangement of the central moiety of the compounds does not seem to enhance the NB bond strength by interaction of this bond with the vicinal CN bond. Rather, in the case of R′ being a hydrocarbon group, the nature of the NB bond is similar to that found in (monoamino) diorganyl‐boranes, R2NBr 2′. Similarly, (CF3)2CNB[N(CH3)2]2 may ve viewed as a trisaminoborane. However, the rigid CNBN2 unit makes this compound colored and the electronic structure of the species was studied; theoretical and experimental data are in good agreement.