Ligand exchange and hydrogen shift reactions in the cyclohexadienyltricarbonylmanganese series

Abstract

On heating, cyclohexadienyltricarbonylmanganese derivatives can undergo hydrogen migration from the 6-endo position; the 6-exo-methyl derivative is thus converted into the 1- and 2-methyl isomers, but with arenes as solvents the principal reaction is exchange in which the original 6-endo-H becomes attached to the newly introduced arene so that both reactions can be visualised as proceeding via hydrido-manganese die complexes.