Abstract
Abstract : The series of neopentylgallium compounds, Ga(CH2CMe3)3, Ga(CH2CMe3)2CL, Ga(CH2CMe3)2Br, Ga(CH2CMe3)CL2, Ga(CH2CMe3)I2, have been prepared by very facile, high yield routes, have been easily purified and have been fully characterized. The new compound Ga(CH2CMe3)3 is a nonpyrophoric liquid which exists as monomeric, three-coordinate gallium species in benzene solution. Cryoscopic molecular weight studies indicate that Ga(CH2CMe3)2CL, Ga(CH2CMe3)CL2 and Ga(CH2CMe3)Br2 are dimeric in benzene solution. Consequently, it is noteworthy that an equimolar mixture of (Ga(CH2CMe3)2CL)2 and (Ga(CH2CMe3)CL2)2 does not undergo a rapid exchange reaction at room temperature as four 1H NMR lines are observed. A comparison of the properties of the neopentyl- trimethylsilylmethylgallium derivatives suggest that the neopentyl group has larger steric effects and stronger electron withdrawing properties than the corresponding trimethylsilylmethyl substituents.
Published Version
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