Cyclic four-coordinate boron compounds from 5-amino-1,2,4-triazole and aromatic nitriles

A new series of cyclic compounds of four coordinate boron- the dialkylboryl-((1,2,4-triazol-5-yl)amidinates) (IX)- has been synthesized from 5-amino-1,2,4-triazole, aromatic nitriles, and trialkylboranes. In the crystalline, dimeric dialkylboryl derivatives of 5-amino-1,2,4-triazole the Alk/sub 2/B groups are bonded to the ring N atoms. The crystalline and molecular structure of dipropylboryl((1,2,4-triazol-5-yl)benzamidinate) (IXa) have been determined by X-ray crystallography.