| http://www.w3.org/ns/prov#value | - sten salt selected from the group consisting of tungsten hexahalides and tungsten oxyhalides, (2) a reducing agen selected from the group defined by the formulae: II Ii-n and R M X wherein n is at least one and not more than two, X is a halogen and R is an alkyl radical containing from one to 10 carbon atoms; and M is selected from boron, aluminum, gallium and indium; and (3) a ligand of the formu
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