| http://www.w3.org/ns/prov#value | - wherein Ra and Rb, which may be the same or different, are hydrocarbon groups of 1 to 15, preferably 1 to 4 carbon atoms, X is a halogen atom, 0<m???3, 0???n<3, 0???p<3, 0???q<3 and m+n+p+q=3, such as trimethylaluminum, tri-n-butylaluminum, triisobutylaluminum and diisobutylaluminumhydride;
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