Treatment of GaCl3 with one equiv of Li[NC4H 3(CH2NMe2)-2] (n = 1, 2, 3) in diethyl ether at -78 °C yields GaCl3-n[NC4H3(CH 2NMe2)-2]n (n = 1, 1; n = 2, 2; n = 3,3). Compound 1 reacts with two equiv of RLi to afford GaR2[NC 4H3(CH2NMe2)-2] (4a, R=Me; 4b, R=Bu) via transmetallation. Reacting 2 with one equiv of RLi in diethyl ether, 3 and 4 are formed via ligand redistribution. Variable temperature 1H NMR spectroscopic experiments reveal that the five-coordinate gallium compound 3 is fluxional and results in a coalescence temperature at 5 °C, at which ΔG≠ is calculated at ca. 10.4 Kcal/mole. All the new compounds have been characterized by 1H and 13C NMR spectroscopy and the structures of compounds 3 and 4a have also been determined by X-ray crystallography.
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