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Kinetic studies on the reaction between [WH4(PMePh2)4] and anhydrous HCl in tetrahydrofuran show that the formation of [WH5(PMePh2)4]+ occurs by two pathways, one involving direct protonation at the metal and the other involving initial attack at a hydrido ligand to generate [WH3(η2-H2)(PMePh2)4]+ which subsequently rearranges to give the pentahydride.
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Oglieve et al. (1992) studied this question.
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