Electrical conductivity of fused lead bromide + potassium bromide mixtures

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Abstract
Bridge-terminal exchange of methyl groups in trimethylaluminium dimer and the exchange of methyl groups between the dimer and trimethylgallium or dimethylzinc are all interpreted as proceeding by initial rate-determining dissociation of the trimethyl-aluminium dimer to liquid-caged monomer pair. Most exchange occurs before the monomers of the pair become separated. An alternative mechanism in which exchange follows separation is rejected. ��� The choice of mechanism is based on (a) p.m.r. kinetics of exchange between trimethylgallium and trimethylaluminium in cyclopentane; (b) p.m.r. kinetics of exchange between dimethylzinc and trimethylaluminium in cyclopentane; and (c) estimates of the rate of recombination of trimethylaluminium monomer.

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