Dimeric Aluminium Amides

The chemistry of indium complexes of aU types in metal oxidation states lower than +3 has been comprehensively reviewed. Few lower oxidation state mononuclear amido complexes of indium are well characterized, however, and no structure has been reported for an In(I) amide. The compound In N(SiMe3)2 n. which is unstable, " has been characterized NMR spectroscopy but its structure is unknown. The structures of several In(I) complexes, related to amides but outside our current scope, have been described. Like its aluminium and gallium counterparts, the p-diketuninate derivative [ In N(Dipp)C(Me) 2CH] has been characterized, as has the closely related species [ In N(Dipp)C(CF3) 2CH]. ° These feature V-shaped, two-coordination at the metal. The less bulky [(In N(Mes)C(Me) 2-CH)2] ° and 15-2.6-.Vlc,)( (Me) i are dimeric with long In In bonds of... 

Similar to the alcoholysis reaction of tetrameric aluminium isopropoxide with tert-butyl alcohol, the alcoholysis reaction of dimeric aluminium tris(dimethyl amide) with rert-butyl alcohol is also slow owing to steric factors. However, the amide route affords finally the tris product [Al(OBu )3], (Eq. 2.108) instead of the mixed product of the type Al2(OBu )5(OPr ) which was finally obtained in the reaction of [Al(OIV)3]4 with an excess of Bu OH. 

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