Aluminum, gallium and copper complexes of 2,2-dimethyl-1,3-propanediamine

Reaction of M('Bu)(3) (M = Al. Ga) with 2,2-dimethyl-1,3-propanediamine (dmpa-H-4) yields the thermally stable Lewis acid-base complexes ('Bu)(3)M(dmpa-H-4), M = Al (1) and Ga (2), respectively. The reaction of 2 with Ga('Bu)(3) yields the formation of [('Bu)(3)Ga](2)(dmpa-H-4) (3). In contrast, reaction of dmpa-H-4 with AlMe3 yields the tri-aluminum compounds [Al3Me5(dmpa-H-2)(2)] (4). Reaction of dmpa-H-4 With CuCl2 in MeOH-THF yields the neutral complex, [Cu(dmpa-H-4)(2)Cl-2] (5), While the reaction in the presence of NaBPh4 and MeCN yields the ionic complex [Cu(dmpa)(2)(MeCN)(2)][BPh4](2) (6). Compound 6 may also be formed directly from compound 5. The molecular structures of compounds 2-6 have been determined by X-ray crystallography. (C) 2002 Elsevier Science B.V. All rights reserved.