ETA)-2-METHOXY-5-METHYLENECYCLOHEXA-1,3-DIENE]IRON AS A SYNTHETIC INTERMEDIATE - SEQUENTIAL ELECTROPHILIC AND NUCLEOPHILIC ADDITIONS

ta)-2-methoxy-5-methylene-cyclohexa-1,3-diene]iron reacts with electro philes to give the cyclohexadienylium-Fe(CO)(3) cation, which either r eacts with nucleophiles to form a new quaternary center or undergoes c ompetitive loss of an acidic alpha-proton to give a new triene complex . This constitutes a new reaction sequence for the synthesis of 4,4-di substituted cyclohexen-2-ones with the simultaneous introduction of tw o functional groups.