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Issue 32, 2010
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Isolation and reactivity of palladium hydrido complexes: intermediates in the hydrodefluorination of pentafluoropyridine

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Abstract

The hydrido complexes trans-[Pd(H)(4-C5NF4)(PiPr3)2] (3) and trans-[Pd(H)(4-C5NF4)(PCy3)2] (5) can be prepared by reaction of trans-[Pd(F)(4-C5NF4)(PiPr3)2] (2) or trans-[Pd(F)(4-C5NF4)(PCy3)2] (4) with HBpin (HBpin = 4,4,5,5-tetramethyl-1,3,2-dioxaborolane, pinacolborane). The iodo and triflato complexes trans-[Pd(I)(4-C5NF4)(PiPr3)2] (7) and trans-[Pd(OTf)(4-C5NF4)(PiPr3)2] (9) are generated on treatment of complex 3 with MeI or ethyltrifluoromethanesulfonate (EtOTf), respectively. Treatment of 3 with Ph3CPF6 in MeCN results in the formation of trans-[Pd(4-C5NF4)(NCMe)(PiPr3)2]PF6 (6a). Heating 3 to 60 °C gives the products of reductive elimination 2,3,5,6-tetrafluoropyridine as well as [Pd(PiPr3)2] (1). In the presence of pentafluoropyridine [Pd(PiPr3)2] (1) affords the oxidative addition product 2. In a catalytic experiment, pentafluoropyridine can be converted into 2,3,5,6-tetrafluoropyridine in the presence of HBpin with 44% yield when 10% of 3 is employed as catalyst.

Graphical abstract: Isolation and reactivity of palladium hydrido complexes: intermediates in the hydrodefluorination of pentafluoropyridine

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Publication details

The article was received on 06 Mar 2010, accepted on 06 May 2010 and first published on 15 Jun 2010


Article type: Paper
DOI: 10.1039/C0DT00086H
Citation: Dalton Trans., 2010,39, 7513-7520
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    Isolation and reactivity of palladium hydrido complexes: intermediates in the hydrodefluorination of pentafluoropyridine

    D. Breyer, T. Braun and A. Penner, Dalton Trans., 2010, 39, 7513
    DOI: 10.1039/C0DT00086H

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