Proton-catalyzed hydrogenation of a d(8) Ir(I) complex yields a trans Ir(III) dihydride.
Proton-catalyzed hydrogenation of a d(8) Ir(I) complex yields a trans Ir(III) dihydride.
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DOI:
10.1021/ja100168w
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发表时间:
2010-04-07
影响因子:
15
通讯作者:
Brookhart, Maurice
中科院分区:
文献类型:
--
作者:
Findlater, Michael;Bernskoetter, Wesley H.;Brookhart, Maurice
Hydrogenation of the (PONOP)Ir(I)CH3complex [PONOP = 2,6-bis(di-tert-butylphosphinito)pyridine] yields the unexpectedtrans-dihydride species (PONOP)IrCH3(H)2. Mechanistic investigations have revealed that this reaction proceeds via proton-catalyzed H2cleavage, a pathway that circumvents the intermediacy of the typically invokedcis-dihydride isomer. Protonation yields the cationic (PONOP)Ir(CH3)(H)+complex, which is then trapped by H2to yield an η2-H2complex. Deprotonation of this species yields thetrans-dihydride. Intermediates in the proposed pathway have been confirmed by independent low-temperature syntheses and spectroscopic observations.
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