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JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 129, Issue 51, Pages 15774-+Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ja0747674
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Ru K-edge XAS data indicate that second generation ruthenium-based olefin metathesis precatalysts (L = N-heterocyclic carbene) possess a more electron-deficient metal center than in the corresponding first generation species (L = tricyclohexylphosphine). This surprising effect is also observed from DFT calculations and provides a simple rationale for the slow phosphine dissociation kinetics previously noted for second-generation metathesis precatalysts.
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