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Volumn 48, Issue 16, 2009, Pages 7828-7837

Investigation of the reactivity of Pt phosphinito and molybdocene nitrile hydration catalysts with cyanohydrins

Author keywords

[No Author keywords available]

Indexed keywords

CYANOHYDRIN; NITRILE; PLATINUM COMPLEX; WATER;

EID: 68949097266     PISSN: 00201669     EISSN: None     Source Type: Journal    
DOI: 10.1021/ic900734d     Document Type: Article
Times cited : (52)

References (35)
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    • Several noteworthy acid-free synthetic methods for the hydration of cyanohydrins utilizing boron, metal oxides, and nitrile hydratase enzymes as mediators have been disclosed in patents and in the literature. These methods are summarized in the Supporting Information
    • Several noteworthy acid-free synthetic methods for the hydration of cyanohydrins utilizing boron, metal oxides, and nitrile hydratase enzymes as mediators have been disclosed in patents and in the literature. These methods are summarized in the Supporting Information.
  • 7
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    • PCT Intl. Patent Appl. WO 9630379
    • Parkins, A. W.; Ghaffar, T. PCT Intl. Patent Appl. WO 9630379, 1996.
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    • (2002) Concurrency and Computation: Practice and Experience, Ecce , vol.14 , pp. 1221-1239
    • Schuchardt, K.L.D.B.T.1    Black, G.D.2
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    • 68949091376 scopus 로고    scopus 로고
    • Black, G.; Daily, 1; Didier, T.; Elsethagen, T.; Feller, D.; Gracio, D.; Hackler, M.; Havre, S.; Jones, D.; Jurrus, E.; Keller, T.; Lansing, C.; Matsumoto, S.; Palmer, B.; Peterson, M.; Schuchardt, K.; Stephan, E.; Taylor, H.; Thomas, G.; Vorpagel, E.; Windus, T. A Problem Solving Environment for Computational Chemistry, 3.2; Ecce: 2004.
    • Black, G.; Daily, 1; Didier, T.; Elsethagen, T.; Feller, D.; Gracio, D.; Hackler, M.; Havre, S.; Jones, D.; Jurrus, E.; Keller, T.; Lansing, C.; Matsumoto, S.; Palmer, B.; Peterson, M.; Schuchardt, K.; Stephan, E.; Taylor, H.; Thomas, G.; Vorpagel, E.; Windus, T. A Problem Solving Environment for Computational Chemistry, 3.2; Ecce: 2004.
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    • Bylaska, E. J.; de Jong, W. A.; Kowalski, K.; Straatsma, T. P.; Valiev, M.; Wang, D.; Aprà, E.; Windus, T. L.; Hirata, S.; Hackler, M. T.; Zhao, Y.; Fan, P.-D.; Harrison, R. J.; Dupuis, M.; Smith, D. M. A.; Nieplocha, J.; Tipparaju, V.; Krishnan, M.; Auer, A. A.; Nooijen, M.; Brown, E.; Cisneros, G.; Fann, G. I.; Friichtl, H.; Garza, J.; Hirao, K.; Kendall, R.; Nichols, J. A.; Tsemekhman, K.; Wolinski, K.; Anchell, J.; Bernholdt, D.; Hess, P. A.; Jaffe, J.; Johnson, B.; Ju, J.; Kobayashi, R.; Kutteh, R.; Lin, Z.; Littlefield, R.; Long, X.; Meng, B.; Wong, T. A.; Zhang, Z. NW Chem 2006.
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  • 29
    • 0034605460 scopus 로고    scopus 로고
    • Prior studies showed that H/D exchange in alcohols occurs by a mechanism involving coordination through the oxygen atom, followed by β-hydride elimination, See Balzarek, C, Weakley, T. J. R, Tyler, D. R. J. Am. Chem. Soc. 2000, 722, 9427, However, beta-hydride elimination is not possible from coordinated ACH because it is a tertiary alcohol
    • Prior studies showed that H/D exchange in alcohols occurs by a mechanism involving coordination through the oxygen atom, followed by β-hydride elimination. (See Balzarek, C.; Weakley, T. J. R.; Tyler, D. R. J. Am. Chem. Soc. 2000, 722, 9427.) However, beta-hydride elimination is not possible from coordinated ACH because it is a tertiary alcohol.
  • 30
    • 68949113167 scopus 로고    scopus 로고
    • The rates shown in the table were calculated for the nitrile substrates based on the percent conversion after 2 h of reaction. No carboxylic acid product was observed in the reaction mixtures of these systems, even after prolonged heating. Note that all of the reactions proceeded to completion and displayed first- or zero-order dependence on the substrate and eventually proceeded to completion.31
    • 31
  • 31
    • 68949128213 scopus 로고    scopus 로고
    • For the reactions carried out at 43 °C, nitriles containing electron-withdrawing groups displayed pseudo-first order kinetics. In contrast, pseudo-zero-order kinetics were observed for electron-donating nitriles, indicating a change in the rate-determining step. This inconsistency precluded generation of a Hammett plot. Kinetic traces for each substrate are available in the Supporting Information.
    • For the reactions carried out at 43 °C, nitriles containing electron-withdrawing groups displayed pseudo-first order kinetics. In contrast, pseudo-zero-order kinetics were observed for electron-donating nitriles, indicating a change in the rate-determining step. This inconsistency precluded generation of a Hammett plot. Kinetic traces for each substrate are available in the Supporting Information.
  • 32
    • 68949109340 scopus 로고    scopus 로고
    • This value was the rate after 30 min of reaction
    • This value was the rate after 30 min of reaction.
  • 33
    • 68949106885 scopus 로고    scopus 로고
    • Unfortunately, rate data could not be obtained for the 2-methox-yisobutyronitrile. However, the reaction of ∼0.50 M 2-methoxyisobutyro-nitrile did proceed to completion.
    • Unfortunately, rate data could not be obtained for the 2-methox-yisobutyronitrile. However, the reaction of ∼0.50 M 2-methoxyisobutyro-nitrile did proceed to completion.
  • 34
    • 68949132070 scopus 로고    scopus 로고
    • 2O)2H}] is described in more detail in a following section.
    • 2O)2H}] is described in more detail in a following section.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.