The use of Lewis acid AlCl3 as a promoter in the Pd-complex catalytic system of the cyclohexene hydroethoxycarbonylation reaction
Циклогексенді гидроэтоксикарбонилдеу реакциясының Pd-комплексті каталитикалық жүйесінде AlCl3 Льюис қышқылын промотор ретінде қолдану
Использование кислоты Льюиса AlCl3 в качестве промотора в Pd-комплексной каталитической системе в реакции гидроэтоксикарбонилирования циклогексена
Kudaibergenov N.Zh. Shalmagambetov K.M. Vavasori A. Zhaksylykova G.Zh. Kanapiyeva F.M. Almatkyzy P. Mamyrkhan D.B. Bulybayev M.
2021E.A.Buketov Karaganda State University Publish House
Bulletin of the Karaganda University Chemistry Series
2021#101Issue 28 - 17 pp.
This paper presents the results of detailed studies of the possibility of using Lewis acid AlCl3 as a promoter of the catalytic three-component system PdCl2(PPh3)2–PPh3–AlCl3 in the hydroethoxycarbonylation reaction of cyclohexene at low carbon monoxide pressures (2.5 MPa). As a result a high catalytic activity of the three-component system was established and the reaction proceeds regioselectively with the formation of ethyl ether of cyclohexanecarboxylic acid. The optimal conditions of the process have been elaborated (molar ratio of the starting reagents [Cyclohexene]:[Ethanol] = 1:1; molar ratio of the components of the catalytic system = = [PdCl2(PPh3)2]:[PPh3]:[AlCl3] = 1:6:9; carbon monoxide pressure PCO = 2.5 MPa; process temperature T = 120 °C and reaction time τ = 5 h) at which the target product yield reaches 80.7 %. To identify the obtained ethyl ester of cyclohexane carboxylic acid gas chromatographic analysis and mass- and IR- spectra were carried out. Based on the data obtained, a possible mechanism of the reaction route of cyclohexene carbonylation with carbon monoxide and ethanol in the presence of the three-component system PdCl2(PPh3)2–PPh3–AlCl3 is proposed and discussed.
Aluminium (III) chloride , Carbon monoxide , Cyclohexene , Ethyl ester of cyclohexanecarboxylic acid , Hydroalkoxycarbonylation , Pd-complex catalysts , Phosphine ligands , “Hydride” mechanism
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Center of Physical Chemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, Kazakhstan
Department of Molecular Science and Nanosystems, Ca’ Foscari University Venice, Scientific Campus, Venezia, Italy
Center of Physical Chemical Methods of Research and Analysis
Department of Molecular Science and Nanosystems
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