| http://www.w3.org/ns/prov#value | - rocarbyl group, a tri(hydrocarbyl)silyl group, or a tri(hydrocarbyl)silylhydrocarbyl group, said R.sup.6 groups containing up to 20 atoms notcounting hydrogen; and LB is a Lewis base, especially an either, amine, or phosphine of up to 20 carbons.The complexes are desirably prepared in an inert solvent, especially an aliphatic or aromatic hydrocarbon or ether, employing temperatures from -100.degre
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