Synthesis and Characterization of HC{C(Me)N(C6H3-2,6-i-Pr2)}2MX2 (M = Al, X = Cl, I; M = Ga, In, X = Me, Cl, I): Sterically Encumbered β-Diketiminate Group 13 Metal Derivatives

A series of group 13 metal complexes featuring the β-diketiminate ligand [{(C6H3-2,6-i-Pr2)NC(Me)}2CH]- (i.e., [Dipp2nacnac]-, Dipp = C6H3-2,6-i-Pr2) have been prepared and spectroscopically and structurally characterized. The chloride derivatives Dipp2nacnacMCl2 (M = Al (3), Ga (5), In (8)) were isolated in good yield by the reaction of 1 equiv of Dipp2nacnacLi·Et2O (2) and the respective metal halides. The iodide derivatives Dipp2nacnacMI2 (M = Al (4), Ga (6), In (9)), which are useful for reduction to afford M(I) species, were made by a variety of routes. Thus, 4 was obtained by treatment of the previously reported Dipp2nacnacAlMe2 with I2, whereas the gallium analogue 6 was obtained as a product of the reaction of “GaI” with Dipp2nacnacLi·Et2O, and 9 was obtained by direct reaction of InI3 and the lithium salt. The methyl derivatives Dipp2nacnacMMe2 (M = Ga (7), In (10)), which are analogous to the previously reported Dipp2nacnacAlMe2, were synthesized by the reaction of GaMe3 with Dipp2nacnacH (1) or...