Hydroformylation of olefins catalysed by dichlorobis(salicylaldehyde)-o-phenylenediimmatoruthenate(III)

Abstract

The kinetic study of hydroformylation of 1-hexene, cyclohexene and cyclooctene was performed using Ru^III(saloph)Cl₂⁻¹ (saloph = bis(salicylaldehyde)-o-phenylenediimme) as a catalyst in ethanolic medium at 130°C and 21 atm CO + H₂ (1:1). Hydroformylation of 1-hexene gave the products 1-heptaldehyde (75%) and 2-methylhexaldehyde (25%) at the turnover rate of 14 mol product per mol catalyst per hour. Cyclohexene and cyclooctene gave cyclohexanecarboxyaldehyde and cyclooctylcarbinol, respectively. The rate of hydroformylation of these olefins showed first-order dependence with respect to catalyst, substrate and dissolved CO + H₂ (1:1) concentration, respectively. The activation energies evaluated for 1-hexene, cyclohexene and cyclooctene are 19.0, 24 and 21.0 kcal mol⁻¹, respectively.