Organomanganese complexes of podocarpic acid derivatives

Abstract

Cyclomanganation reactions of podocarpic acid derivatives containing aldehyde, ketone, ester, or oxime groups as directing functionalities have been investigated. Attempted complexation of amide-containing ligands proved generally to be unsuccessful whereas benzylic ketones gave their corresponding tetracarbonyl complexes in high yields. Complexation of ligands containing either two potential sites for manganation or two potential ligating groups were also investigated and the structures of the isolated complexes established unequivocally by NMR or X-ray crystallogr