SYNTHESES AND CARBON MONOXIDE SUBSTITUTION REACTIONS OF η5-N-HETEROCYCLE MANGANESE TRICARBONYLS

Article abstract of DOI:10.1016/0022-328X(85)80340-5

A new method of synthesis of η⁵-pyrrolyltricarbonylmanganese(I) is reported, along with the first syntheses of η⁵-indolyltricarbonylmanganese(I) and of η⁵-1-pyrindinyltricarbonylmanganese(I).Kinetic studies on CO substitution reactions of these η⁵-N-heterocyclic manganese carbonyls show that the reactions take place by a second-order process, first-order in metal complex and first-order in nucleophile.The most significant observation is that the N-heterocyclic compounds react faster than do their carbocyclic counterparts.This anticipated result is consistent with the greater electron-withdrawing ability of the N systems in the transition state for reaction, because N is more electronegative than is C.