The selective preparation of an aluminum oxide and its isomeric C-H-activated hydroxide.

Research paper by Hongping H Zhu, Jianfang J Chai, Vojtech V Jancik, Herbert W HW Roesky, William A WA Merrill, Philip P PP Power

Indexed on: 21 Jul '05Published on: 21 Jul '05Published in: Journal of the American Chemical Society


An aluminum oxide [LAlO]2 (1) has been prepared by the oxidative addition of aluminum(I) monomer LAl (L = HC[(CMe)(NAr)]2, Ar = 2,6-iPr2C6H3) with molecular oxygen. The short Al-O bonds in Al2(mu-O)2 result in short Al...Al contacts and subsequent steric crowding of the Ar substituents from the two oriented L. 1 hydrolyzes to form [LAl(OH)]2(mu-O) (2). A C-H-activated aluminum hydroxide 4, an isomer of 1, however, is obtained by hydrolysis of the bulky aluminum amide 3 rather than by a conversion by high temperature treatment of 1. This indicates selective preparation of isomers 1 and 4.