Wydział Chemii

Wojciech Wojtków

Anna M. Trzeciak

R. Choukroun

J. L. Pellegatta

2004

Journal of Molecular Catalysis A-Chemical

224

81-86

10.1016/j.molcata.2004.06.032

Naukowa

Angielski

Artykuł

A Pd colloid prepared by reduction of the [Pd(η³-allyl)₂Cl]₂ precursor with Vcp₂ (vanadocene) in presence of polyvinylpyrrolidone (PVP) as a protecting polymer was found to be an active and stable catalyst of methoxycarbonylation of iodobenzene carried out in an ionic liquid (IL) medium of [bmim]X and/or [bumepy]X (bmim = 1-methyl-3-butyl imidazolium cation, bumepy = 1-butyl-4-methyl pyridinium cation, X = Cl, BF₄, PF₆) or in the presence of ammonium salts of [R₄N]X type (R = ⁿBu, Et, Me; X = Cl, Br, I). The yield of benzoic acid methyl ester produced in methoxycarbonylation of iodobenzene in ionic liquids depends on their structure: those with the pyridinium cation are much more effective than those with the imidazolium one. At the optimal concentration of methanol, the yield of methoxycarbonylation reaction catalyzed by Pd colloid decreases in the order: [ⁿBu₄N]Br > [ⁿBu₄N]I > [ⁿBu₄N]Cl > [bumepy]PF₆ > [Et₄N]Br > [bumepy]Cl > [bumepy]BF₄ > [Et₄N]Cl > [bmim]PF₆ > [bmim]BF₄ > [bmim]Cl.

https://doi.org/10.1016/j.molcata.2004.06.032

http://www.elsevier.com