摘要:
A modified procedure for the synthesis of new pentacarbonyl(2-oxacyclopentylidene)chromium compounds is reported. Its application to optically pure epoxides allowed us to obtain the corresponding optically pure cyclic chromium carbene complexes. The oxidation of the (2-oxacyclopentylidene)pentacarbonyl-chromium compounds led to the corresponding substituted gamma-butyrolactones.