Rapid C-H bond activation by a monocopper(III)-hydroxide complex.
Rapid C-H bond activation by a monocopper(III)-hydroxide complex.
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DOI:
10.1021/ja207882h
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发表时间:
2011-11-09
影响因子:
15
通讯作者:
Tolman, William B.
中科院分区:
文献类型:
--
作者:
Donoghue, Patrick J.;Tehranchi, Jacqui;Cramer, Christopher J.;Sarangi, Ritimukta;Solomon, Edward I.;Tolman, William B.
One electron oxidation of the tetragonal Cu(II) complex [Bu4N][LCuOH] at −80 °C generated the reactive intermediate LCuOH, which was shown to be a Cu(III) complex on the basis of spectroscopy and theory (L = N,N′-bis(2,6-diisopropylphenyl)-2,6-pyridinedicarboxamide). The complex LCuOH reacts with dihydroanthracene to yield anthracene and the Cu(II) complex LCu(OH2). Kinetic studies showed that the reaction occurs via H-atom abstraction via a second-order rate law at high rates (cf. k = 1.1(1) M−1s−1 at −80 °C, ΔH‡ = 5.4(2) kcal mol−1, ΔS‡ = −30(2) eu) and with very large kinetic isotope effects (cf. kH/kD = 44 at −70 °C). The findings suggest that a Cu(III)-OH moiety is a viable reactant in oxidation catalysis.
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