Metal carbonyl chemistry. Part XXIV. Reactions of methyl- and phenyl-pentacarbonylmanganese with dicyclopentadiene and other dienes

Abstract

Dicyclopentadiene reacts with [RMn(CO)₅](R = Me or Ph) in non-donor solvents to afford 1 : 1 adducts, [(RCO·C₁₀H₁₂)Mn(CO)₄], as the major reaction products, together with small amounts of 2 : 1 adducts, [(RCO·C₁₀H₁₂)Mn(CO)₄(C₁₀H₁₂)]. When the reaction of [MeMn(CO)₅] and the diene is carried out in acetonitrile solvent under similar conditions the 2 : 1 adduct is formed as the major product, with the 1 : 1 adduct and an acyl complex, [(MeCO·C₁₀H₁₂·CO)Mn(CO)₄(C₁₀H₁₂)], as minor products. The structures and reactions of some of these compounds with trivalent phosphorus ligands and with sulphur dioxide are described. The attempted reactions of [MeMn(CO)₅] with norbornadiene and cyclo-octa-1,5-diene, and the reactions between dicyclo-pentadiene and [MeCo(Co)₄] and [MeRe(Co)₄] are also described.