期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 54, 期 29, 页码 8466-8470出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201501996
关键词
Ar-X activation; autocatalysis; DFT calculations; kinetics; ruthenium
资金
- ICIQ Foundation
- Spanish Government [CTQ2011-25418]
- Spanish Government (Severo Ochoa Excellence Accreditation) [SEV-2013-0319]
- Government of Spain (MICINN) [BES-2012-054922]
- EPSRC [EP/J010677/1]
- EPSRC [EP/J010677/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/J010677/1] Funding Source: researchfish
[(Ph3P)(3)Ru(L)(H)(2)] (where L= H-2 (1) in the presence of styrene, Ph3P(3), and N-2 (4)) cleave the Ph-X bond (X= Cl, Br, I) at RT to give [(Ph3P)(3)RuH(X)] (2) and PhH. A combined experimental and DFT study points to [(Ph3P)(3)Ru(H)(2)] as the reactive species generated upon spontaneous loss of L from 3 and 4. The reaction of 3 with excess PhI displays striking kinetics which initially appears zeroth order in Ru. However mechanistic studies reveal that this is due to autocatalysis comprising two factors: 1) complex 2, originating from the initial PhI activation with 3, is roughly as reactive toward PhI as 3 itself; and 2) the Ph-I bond cleavage with the just-produced 2 gives rise to [(Ph3P)(2)RuI2], which quickly comproportionates with the still-present 3 to recover 2. Both the initial and onward activation reactions involve PPh3 dissociation, PhI coordination to Ru through I, rearrangement to a eta(2)-PhI intermediate, and Ph-I oxidative addition.
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