Reduction of tungsten complexes with primary phosphines and lithium dialkyl phosphides. X-ray crystal structures of [(Cp*WCl2)2·(t-Bu2PPt-Bu2)2], [(Cp*WCl4)(H2PPh)], [{(PhN)WCl2(PMe3)2} 2(μ-N2)] and trans-WCl4(H2Pt-Bu)2 (Cp* = η5-C5Me5)

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