Syntheses and structures of the arylaluminum chalcogenides (ArAIE)(2) (Ar=2-(NEt2CH2)-6-MeC6H3, E = Se; Ar=2,6-(NEt2CH2)(2)C6H3, E = Se, Te)

Abstract

Two intramolecular stabilized arylaluminum dihydrides, {2-(NEt2CH2)-6-MeC6H3}AlH2 (1) and {2,6-(NEt2CH2)(2)C6H3}AlH2 (2), were prepared by reducing the corresponding dichlorides with an excess of LiAlH4 in diethyl ether. Reactions of 1 and 2 with elemental selenium afforded the dimeric arylaluminum selenides {2-(NEt2CH2)-6-MeC6H3}AlSe (3) and {2,6-(NEt2CH2)(2)C6H3}AlSe (4). Reaction of 2 with metallic tellurium gave the dimeric arylaluminum telluride {2,6-(NEt2CH2)(2)C6H3}AlTe (5). The possible reaction pathway is discussed, and molecular structures determined by single-crystal X-ray analyses are presented fur 3 and 5.