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Preparation of the alkynyl-hydride complexes MH(CCR) {PPh(OEt)2}4 of iron and ruthenium

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Abstract

The hydride FeClHP4 [P = PPh(OEt)2] was prepared by allowing the complex [FeH(η2-H2)P4]BPh4 t react with an excess of lithium chloride. Treatment of FeClHP4 with lithium acetylide Li[RCC] (R = Ph, p-tolyl or tBu) gave the alkynyl-hydride FeH(CCR)P4 derivatives. Related ruthenium RuH(CCR)P4 complexes were also obtained by treating RuH2P4 with CF3SO3Me, followed by treatment with lithium acetylide. The characterization of the complexes by IR and 1H, 31P and 13C NMR spectroscopy is discussed, along with some studies on the protonation reactions of the alkynyl-hydride derivatives.

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