| http://www.w3.org/ns/prov#value | - ion, at a temperature below 0 C., of vanadium triacetylacetonate, an organometallic aluminum monohalide of the formula AlRRX in which R and R are selected from the group consisting of alkyl, aryl, alkylaryl, and cycloalkyl groups containing up to 10 carbon atoms and X is a halogen atom, in a molar ratio of the vanadium triacetylacetonate to organornetallic aluminum monohalide of 1:5, and of a Lew
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