Organoaluminium and -gallium compounds with N,N-diisopropylaminomethyl groups

The N,N-diisopropylaminomethyl aluminium compound tBu2AlCH2NiPr2 x LiCl]2(1) and the gallium compounds LitBu2Ga(CH2NiPr2)2](2) and tBu2GaCH2N(H)iPr2]Cl x tBu3Ga (3) were prepared by transmetallation of N,N-diisopropylaminomethyllithium LiCH2NiPr2 with di-tert-butylaluminium or -gallium chloride, and characterised by elemental analyses, multinuclear NMR spectroscopy (1H, 13C, 27Al, 7Li) and IR spectroscopy. The crystal structures have been determined by single crystal X-ray diffraction. Compound aggregates as a centrosymmetric dimer, with two Al-C-N units connected by a frame of two LiCl molecules Al-Cl 2.367(1), Cl-Li 2.339(4) and 2.374(4), Li-N 1.977(4)A]. Compound 2 is a lithium organogallate with two weak LiN bonds 1.965(7) and 1.937(7)A]. Compound 3 contains two different moieties: tBu3Ga and a tBu2GaCH2N(H)iPr2]+ cation, which are bridged by a Cl- anion Ga-Cl 2.445(1) and 2.579(1), HCl 2.362(3)A].