Proton-catalyzed hydrogenation of a d8 Ir(I) complex yields a trans Ir(III) dihydride

Michael Findlater, Wesley H. Bernskoetter, Maurice Brookhart

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrogenation of the (PONOP)Ir(I)CH 3 complex [PONOP = 2,6-bis(di-tert-butylphosphinito)pyridine] yields the unexpected trans-dihydride species (PONOP)IrCH 3 (H) 2 . Mechanistic investigations have revealed that this reaction proceeds via proton-catalyzed H 2 cleavage, a pathway that circumvents the intermediacy of the typically invoked cis-dihydride isomer. Protonation yields the cationic (PONOP)Ir(CH 3 )(H) + complex, which is then trapped by H 2 to yield an η 2 -H 2 complex. Deprotonation of this species yields the trans-dihydride. Intermediates in the proposed pathway have been confirmed by independent low-temperature syntheses and spectroscopic observations. © 2010 American Chemical Society.
Original languageEnglish
Pages (from-to)4534-4535
JournalJournal of the American Chemical Society
StatePublished - Apr 7 2010

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