Aluminium and gallium trihalide adducts of 2,4,6-triorganylborazines and the synthesis of triorganylborazinium tetrabromoaluminates

Abstract

Borazines of type R3B3N3H3 (R = Me, Et, i-Pr, t-Bu, Ph) add AlBr3 and GaCl3 in a 1:1 ratio to one of its N atoms. During this process the planarity of the borazine is lost. The ring system of the adducts show a semi chair conformation. HBr gas reacts with R3B3N3H3· AlBr3 in toluene with formation of hitherto unknown borazinium tetrabromo aluminates (R3B3N3H 4)+ (AlBr4). The ring system of the cation is almost planar but it shows like the adducts three different B-N bond lengths. ©ARKAT USA, Inc.