CATIONS DERIVED FROM BH2+ . UNSYMMETRICAL BIS-AMINE SUBSTITUTION ON BORON

Salts of boron cations, with two different tertiary amines coordinated to a BH2+ group, have been synthesized by displacement of iodide from adducts of monoiodoborane with trimethylamine, triethylamine, or pyridine. Pyridines substituted with a variety of functional groups, quinoline, N,N-dimethylaniline, and triethylamine were used as the second amine. The success of the preparation of these cations was found to depend on the basicity of the displacing amines and favorable steric factors. Carbonyl and nitrile substituents, which are normally reduced by B-H bonds, did not interfere with the synthesis. The cations could be converted to symmetrical derivatives by transamination. The compounds were stable at room temperature to Ag+, Hg2+, Cu2+, Cr2O72-, and H2O2, as well as to acid or base. They decomposed slowly in hot HCl, water, or NaOH. © 1969, American Chemical Society. All rights reserved.