Syntheses and structures of products resulting from oxygen insertion and hydrolysis of Salan-Al compounds

摘要

The combination of one and two equivalents of AlMe_3 with the ligand, Salean(~tBu)H_4 (N,N'-bis((3,5-di-tert-butyl)-2-hydroxybenzyl)-1,2-diamino ethane leads to the compounds, Salean(~tBu)H_2AlMe (1) and Salean(~tBu)HAlMe(AlMe_2) (2). When 2 is exposed to air, [Salean(~tBu)HAlOMe]_2 (3) first forms, and then, after several days, [Salean(~tBu)H_2AlOH]_2 (4). Compound 4 is the only product that occurs when 1 is exposed to air. All four compounds have been characterized by spectroscopic (IR, ~1H NMR, ~(27)Al NMR) and physical techniques (Mp, C,H analysis) and, in the case of 3 and 4, by X-ray crystallography. The structures consist of dimeric units with bridging OMe and OH groups.