| http://www.w3.org/ns/prov#value | - ethyl ether, methyl tert-butyl ether, dioxane, tetrahydrofuran, glycol dimethyl ether or diethylene glycol dimethyl ether, hydrocarbons such as benzene, xylene, toluene, hexane, cyclohexane or petroleum fractions, or other solvents such as 1,2-dimethoxyethane, acetonitrile or pyridine, preferably toluene with trimethylaluminium in hexane and ammonium chloride, firstly at ???20??? C. and then at ro
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