REACTION OF BONYL(EXO-CYCLOPENTADIENYL-ETA(5)-CYCLOHEXADIENYL) MANGANESE WITH ARYLLITHIUM REAGENTS - CRYSTAL-STRUCTURES OF [C5H5-((ETA(5)-C6H6)(CO)(2)MN=C(OC2H5)C6H5)] AND [C5H5-((ETA(5)-C6H6)(CO)(2)MN=C(OC2H5)C6H4CH3-O)]

The reaction of -cyclopentadienyl-eta(5)-cyclohexadienyl)manganese (1) with aryllithium reagents, ArLi (Ar=C6H5, o-, m-, p-CH3C6H4, p-CH3OC6 H4, p-CF3C6H4), in ether at low temperature afforded acylmetalate inte rmediates, followed by alkylation with Et(3)OBF(4) in an aqueous solut ion at 0 degrees C to give the six alkoxycarbene manganese complexes [ C5H5-{(eta(5)-C6H6)(CO)(2)Mn=C(O-C2H5)Ar}] (2, Ar=C6H5; 3, Ar=o-CH3C6H 4; 4, Ar=m-CH3C6H4; 5, Ar=p-CH3C6H4; 6, Ar=p-CH3OC6H4; 7, Ar=p-CF3C6H4 ). The molecular structures of 2 and 3 have been established by X-ray diffraction studies.