Abstract
Cyclohexene hydrocarbomethoxylation catalyzed by Pd(OAc)2-p-toluenesulfonic acid-diphosphine systems has been investigated for a wide range of diphosphine structures and concentrations. The factors controlling the activity of the palladium-containing catalysts include the hydrocarbon moiety of the ligand and the mutual arrangement of the phosphine groups. A comparison between the promoting effects of monophosphine and diphosphine ligands has demonstrated that bridged trans-diphosphines are more efficient in kinetic and concentration terms (TOF and P/Pd ratio, respectively). In particular, the promoting activity of diphosphines is one order of magnitude higher than that of triphenylphosphine, and this effect is attained at 8–65 times lower P/Pd ratios. It is discussed how the catalytic properties of the systems depend on the chelate effect and on the geometric compatibility between the diphosphine structure and the arrangement of vacant s and d orbitals of the palladium center.
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Original Russian Text © I.E. Nifant’ev, S.A. Batashev, S.A. Toloraya, A.N. Tavtorkin, N.T. Sevost’yanova, A.A. Vorob’ev, V.V. Bagrov, V.A. Aver’yanov, 2012, published in Kinetika i Kataliz, 2012, Vol. 53, No. 4, pp. 483–490.
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Nifant’ev, I.E., Batashev, S.A., Toloraya, S.A. et al. Steric and electronic factors in the promoting activity of diphosphine ligands in cyclohexene hydrocarbomethoxylation catalyzed by palladium acetate. Kinet Catal 53, 462–469 (2012). https://doi.org/10.1134/S0023158412040076
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DOI: https://doi.org/10.1134/S0023158412040076