Derivatives of Δ2- tetrazaboroline. Part VII. Unsymmetrically N-substituted Δ2-tetrazaborolines
Abstract
The products of the reactions between o-, m-, and p-mono-subsituted aniline–boranes, XC6H4NH2,BH3 and phenyl azide have been shown to be mixtures of the 1,4-substituted-Δ2-tetrazaborolines Ph2N4BH, Ph(XC6H4)N4BH, and (XC6H4)2N4BH; this randomization of substituents appears to be a general feature in preparations of unsymmetrically substituted tetraza-Δ2-borolines. The preparation and properties of 1,4-di-p-chlorophenyl-Δ2-tetrazaboroline is reported. Simple calculations on the unsymmetrically substituted phenyl tetrazaborolines have yielded values for the π-bond orders, π-charge distributions, π-stabilization energies, and energies of bands expected for their first electronic transitions.