The relative Lewis acidities of the series of triorganogallium compoun
ds GaR3 (R = Me, Et, CH2CMe3, CH2SiMe3, CH2CMe2Ph, C6H2Me3) toward the
common Lewis base HPPh2 and the relative Lewis basicities of a series
of organophosphines which incorporate an acidic hydrogen HPRR' (PRR'
= PPh2, P(C6H11)(2), PEt2, P(H)(C(6)Hr(11)) toward the common Lewis ac
id Ga(CH2CMe3)(3) have been investigated and compared. Cryoscopic mole
cular weight data permitted an evaluation of the equilibrium constant
for the dissociation. of each of the adducts. The P-31 NMR spectral da
ta, which were consistent with the molecular weight data, were also us
ed to study the relative rates of hydrocarbon elimination reactions to
form (R2GaPRR')(2).