Organochloroaluminate molten salts based on aluminium trichloride or ethylaluminium dichloride and 1-methyl-3-butylimidazolium chloride, 1-butylpyridinium chloride or tetrabutylphosphonium chloride can be used as solvents for the catalytic dimerization of propene to hexenes isomers by nickel complexes.
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Chauvin et al. (1990) studied this question.