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Volumn 127, Issue 14, 2005, Pages 5116-5124

Poisoning of heterogeneous, late transition metal dehydrocoupling catalysts by boranes and other group 13 hydrides

Author keywords

[No Author keywords available]

Indexed keywords

BORATE MINERALS; CATALYSIS; CATALYST POISONING; CATALYSTS; CHEMICAL BONDS; HYDRIDES; REDUCTION; RHODIUM COMPOUNDS; TRANSITION METALS;

EID: 17144373288     PISSN: 00027863     EISSN: None     Source Type: Journal    
DOI: 10.1021/ja0447412     Document Type: Article
Times cited : (79)

References (119)
  • 46
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    • note
    • A heterogeneous catalyst can be completely poisoned by < 1 equiv of ligand (per metal atom) because only a fraction of the metal atoms are on the surface, whereas a homogeneous catalyst would require > 1 equiv of ligand to completely poison the active site.
  • 51
    • 0035922532 scopus 로고    scopus 로고
    • The stability and catalytic activity of colloidal nanoparticles is anticorrelated: the most stable is the least catalytically active. See: Li, Y.; El-Sayed, M. A. J. Phys. Chem. B 2001, 105, 8938.
    • (2001) J. Phys. Chem. B , vol.105 , pp. 8938
    • Li, Y.1    El-Sayed, M.A.2
  • 63
    • 17144405058 scopus 로고    scopus 로고
    • note
    • 3 on Rh colloids. For PPh3 on Pt and Cu colloids, Δδ values of ca. 51-56 and 34 ppm have been observed, respectively. See ref 19.
  • 81
    • 17144425114 scopus 로고    scopus 로고
    • note
    • 2. Unpublished results.
  • 82
    • 17144397795 scopus 로고    scopus 로고
    • note
    • 3 is formed as a byproduct, which is fully removed upon workup as indicated by the lack of a B(1s) peak in the XPS spectrum of the colloidal product. See Figure 2.
  • 92
    • 17144375418 scopus 로고    scopus 로고
    • note
    • 2 in our laboratory have been unsuccessful to date, and thus the reactivity of this species with heterogeneous metal catalysts could not be investigated.
  • 94
    • 0002019682 scopus 로고
    • Ebsworth, E. A. V., Maddock, A. G., Sharpe, A. G., Eds.; Cambridge University Press: Cambridge, U.K.
    • Greenwood, N. N. In New Pathways in Inorganic Chemistry; Ebsworth, E. A. V., Maddock, A. G., Sharpe, A. G., Eds.; Cambridge University Press: Cambridge, U.K., 1968; p 37.
    • (1968) New Pathways in Inorganic Chemistry , pp. 37
    • Greenwood, N.N.1
  • 102
    • 17144423717 scopus 로고    scopus 로고
    • note
    • 3·THF poisoned catalyst with a hydrogen atmosphere did not alter the reactivity of the catalyst; the catalyst was found to remain inactive toward dehydrocoupling. These two results indicate that substantial leaching of boron from the catalyst surface did not occur and that the surface coverage is incomplete, despite the poisoning of the sites responsible for dehydrocoupling. We thank a reviewer for suggesting these experiments.
  • 105
    • 0038682049 scopus 로고    scopus 로고
    • 3·-THF. Morrill, T. C.; D'Souza, C. A. Organometallics 2003, 22, 1626. However, to date, the exact nature of the active catalyst was not determined, and our results suggest that a homogeneous catalyst may need to be considered as the actual species responsible for the catalysis.
    • (2003) Organometallics , vol.22 , pp. 1626
    • Morrill, T.C.1    D'Souza, C.A.2


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.