The W = PR2 complexes 2 obtainable from 1 and R2PH by dehydrohalogenation react with chlorophosphanes to give the complex salts 3, whose cations contain the first side-on coordinated diphosphane ligands (R = iPr, tBu; R′= iPr, Me).
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Jörg et al. (1986) studied this question.
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