Preparation, properties, and molecular structures of dimethylmetal alkoxides and amides of aluminium and gallium

Dimlthylaluminium- (1) and Dimethylgallum-o-methoxyphmyl-1-ethoxide (2) wer e obtained by reaction of Me3Al and Me3Ga respectively with o-Methoxyphenyl -1-ethanol in n-pentane. Dimethylaluminium- (3) and dimethylgallium-o-metho xyphenyl-2-ethylamide (4) were prepared by treatment of Me2AlCl and Me2GaCl respectively with Lithium-o-methoxyphenyl-2-ethylamide. Trimethylgallium-o -methoxyphenylmethvlamine-Adduct (5) was isolated using reaction of Me3Ga w ith the corresponding amine. The compounds were characterised by H-1-, C-13 - and Al-27 n.m.r. spectroscopy. The molecular structures of 2 and 5 were d etermined by X-ray diffraction. Compounds 1-4 form brigded dimeric molecule s. The bond distances of the central Ga2O2 ring in 2 correspond to those of compounds of similar structure.