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High-pressure NMR studies of the water soluble rhodium hydroformylation system

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Abstract

Rh(CO)2(acac) reacts with P(m-C6H4SO3Na.H2O)3 (P/Rh > 3.5) in water under CO to give HRh(CO)[P(m-C6H4SO3Na)3]3 (1a), the structure of which is similar to HRh(CO) (PPh3)3 (1b). High pressure NMR spectra of an aqueous solution containing1a and three molar excess of P(m-C6H4SO3Na)3 does not show the formation of new species up to 200 atm of CO∶H2(1∶1). In contrast,1b, in the presence of three molar excess of PPh3, is completely converted to HRh(CO)2(PPh3)2 (2b) under 30 atm CO/H2(1∶1) in toluene. The activation energy of the dissociation of P(m-C6H4SO3Na)3 from1a in water was found to be 30±1 kcal/mol, which is 11±1 kcal/mol higher than the dissociation of PPh3 from1b in toluene.

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Authors and Affiliations

  1. Corporate Research Science Laboratories, Exxon Research and Engineering Company, 08801, Annandale, NJ

    István T. Horváth, Rodney V. Kastrup, Alexis A. Oswald & Edmund J. Mozeleski

  2. Exxon Chemical Company, 08801, Annandale, NJ, USA

    István T. Horváth, Rodney V. Kastrup, Alexis A. Oswald & Edmund J. Mozeleski

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  1. István T. Horváth
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  2. Rodney V. Kastrup
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  3. Alexis A. Oswald
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  4. Edmund J. Mozeleski
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Horváth, I.T., Kastrup, R.V., Oswald, A.A. et al. High-pressure NMR studies of the water soluble rhodium hydroformylation system. Catal Lett 2, 85–90 (1989). https://doi.org/10.1007/BF00774589

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  • DOI: https://doi.org/10.1007/BF00774589

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