Aluminum Complexes with Sulfide-Linked Bis(phenolato) Ligands: Unusual Structure and Reactivity of the Methyl Bis(phenolato) Complex “[Al(tbmp)Me]” (tbmp = 2,2‘-Thiobis(6-tert-butyl-4-methylphenolato))
journal contributionposted on 11.04.2005, 00:00 by Wigand Braune, Haiyan Ma, Thomas P. Spaniol, Jun Okuda
Trialkylaluminum complexes, AlR3 (R = Me, Et), reacted with the sulfide-bridged bis(phenol) tbmpH2 (tbmpH2 = 2,2‘-thiobis(6-tert-butyl-4-methylphenol)) in a 1:1 ratio to give monoalkyl compounds of the composition “[Al(tbmp)R]” with an unsymmetrical dinuclear structure with both six- and four-coordinate aluminum centers in the solid state. The reaction of 2 equiv of tbmpH2 gave [Al(tbmp)(tbmpH)], which could be deprotonated with triethylamine to give [NEt3H][Al(tbmp)2]. Upon reaction of [Al(tbmp)R]2 with Lewis bases L (L = Et2O, THF, propylene oxide), monomeric, five-coordinate adducts [Al(tbmp)R(L)] were formed, while 2-propanol gave the dinuclear complex [Al(tbmp)(μ-OiPr)]2.