The chemistry and catalytic properties of ruthenium and osmium complexes. Part 1. Homogeneous catalysis of organic reactions by bromo(carbonyl)hydridotris(triphenylphosphine)osmium(II)
Abstract
The title compound catalyses CC bond migration, isomerisation of allyl alcohol, hydrogenation of ayclic and cyclic olefins, dienes, acetylenes, aldehydes, ketones, α,β-unsaturated aldehydes and ketones, and hydroformylation of alkenes under moderate reaction conditions. High selectivities have been observed in the hydrogenation of conjugated and unconjugated dienes to monoenes, C
C to C
C bonds, α,β-unsaturated aldehydes to unsaturated alcohols, and α,β-unsaturated ketones to saturated ketones; L-carvone [2-methyl-5-(1-methylethenyl)cyclohex-2-en-1-one] may be selectively reduced to 2-methyl-5-(1-methylethyl)cyclohex-2-en-1-one or 2-methyl-5-(1-methylethyl)cyclohexanone depending on the reaction conditions.