Cyclohexene hydrocarbomethoxylation catalyzed by ruthenium(III) chloride

Abstract

For the first time, the kinetics of cyclohexene hydrocarbomethoxylation reaction catalyzed by RuCl3 is reported. First order reaction rate dependences were established for cyclohexene and methanol. The extreme dependence of the reaction rate from the partial CO pressure at its dilution with argon was obtained. The dependence of the reaction rate on RuCl3 concentration showed a non-linear growth with an increase in RuCl3 concentration. It was established that adding HCl to the reaction mixture caused a decrease in the reaction rate while adding of NaCl, KCl and NaBr increased its rate. The reaction rate dependence on NaCl concentration had linear character. The kinetic patterns of cyclohexene hydrocarbomethoxylation catalyzed by RuCl3/NaCl system were studied. It was established that the rate dependences on concentration of cyclohexene, methanol, RuCl3, and CO pressure were of the same character as in the absence of NaCl, but the reaction rate increased. It was suggested that the alkoxy mechanism of the investigated reaction and catalytic ruthenium complexes deactivation in the ligand exchange reactions with CO participation. The yield of the cyclohexene hydrocarbomethoxylation product, methyl cyclohexanecarboxylate, under the studied conditions reached 61.7%.