Abstract
The complex [Ru II(EDTA—H)(CO)] (EDTA = ethylenediaminetetraacetic acid) catalyses the carbonylation of cyclohexene in alcohol:water (80:20) mixture to give cyclohexene-1-carboxaldehyde, cyclohexene-3-carboxaldehyde and cyclohexane-carboxaldehyde. The optimum conditions of the reaction are 120 °C and 20 atm CO partial pressure. The effect of catalyst, CO pressure and cyclohexene concentration on the initial rates of carbonylation was investigated. The rate of carbonylation exhibits first-order dependence with respect to catalyst, CO pressure and substrate concentration. The effect of temperature on the rate of cyclohexene carbonylation was studied and the activation energy, E a, evaluated at 16 ± 1 Kcal mol −1. Carbonylations of 1-methyl-, 3-methyl- and 4-methylcyclohexenes conducted at 160 °C and 20 atm CO partial pressure gave the corresponding alcohols.
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