Homoleptic and heteroleptic gallium(III) compounds containing monosubstituted cyclopentadienyl ligands: Ga(C5H4Me)(3), Ga(C5H4SiMe3)(3), and R2Ga(C5H4Me) (R = Me, Et)

The new gallium(III) cyclopentadienyl derivatives Ga(C5H4Me)(3) and Ga(C5H4 SiMe3)(3) have been synthesized by metathetical reactions. Subsequent stoic hiometric ligand redistribution reactions with GaR3 (R = Me, Et) were used to prepare R2Ga(C5H4Me) as pure single compounds. However, when the synthes es of RGa(C5H4Me)(2) (R = Me, Et) and MenGa(C5H4SiMe3)(3-)n (n =1, 2) by an alogous stoichiometric ligand redistribution reactions were investigated, m ixtures of compounds were the isolated products. The heteroleptic organogal lium compound Me2Ga(C5H4Me) has also been prepared in high yields by using metathetical reactions between Me2GaCl and Li(C5H4Me) in pentane and betwee n Cl2Ga(C5H4Me), formed in-situ from Ga(C5H4Me)(3) and GaCl3 in diethyl eth er, and LiMe. All pure compounds have been characterized by their physical properties, elemental analyses, NMR spectra, and cryoscopic molecular weigh t studies.