INTRAMOLECULARLY STABILIZED ORGANOALUMINUM AND ORGANOGALLIUM COMPOUNDS - SYNTHESIS AND X-RAY CRYSTAL-STRUCTURES OF SOME DIMETHYLALUMINUM AND DIMETHYLGALLIUM ALKOXIDES ME(2)M-O-R-OR' AND AMIDES ME(2)M-NH-R-OR'

The intramolecularly stabilized dimeric organoaluminium and organogall ium alkoxide complexes [(CH3)(2)Al(mu-O-R-OR')](2) (R/R' = CH2CH2/C6H5 (1a), CH(CH3)CH2/CH3 (2a), CH2CH2C(CH3)(2)/CH3 (3a), CH2C6H4-2/CH3 (4 a), C6H4-2/CH3 (5a), C6H4-2/C2H5 (6a), C6H3-4-CH3-2/CH3 (7a)), [(CH3)( 2)Ga(mu-O-R-OR')](2) (R/R' = CH(CH3)CH2/CH3 (2b), CH2CH2C(CH3)(2)/CH3 (3b), CH2C6H4-2/CH3 (4b), C6H4-2/CH3 (5b), C6H4-2/C2H5 (6b), CH2CH2/CH 3 (8b)), [(CH3)(2)Al(mu-NH-R-OR')](2) (R/R' = CH2CH2/CH3 (9a) and CH2C H2CH2/CH3 (10a)) have been synthesized from trimethylaluminium or trim ethylgallium and the corresponding alkoxy alcohols. Trimethylgallium r eacts with CH3OCH2CH2NH2 and CH3OCH2CH2CH2NH2 with formation of the 1: 1 adducts 11b and 12b, which decompose above 110 degrees C to yield CH 4 as well as [(CH3)(2)Ga(mu-NH-(CH2)(2)-OCH3)](2) (9b) and [(CH3)(2)Ga (mu-NH-(CH2)(3)-OCH3)](2) (10b) respectively. The H-1-, C-13-NMR and m ass spectra of the new compounds, as well as the X-ray crystal structu re analyses of 2b, 4a, 5a, 5b, 8b, and 12b, are reported and discussed .