The Formation and Chemistry of New Functionally Substituted n5-Cyclopentadienyl-Metal Compounds: Routes to New Vinyl Monomers

Reactions of cyclopentadienylsodium uith ethyl formate, methyl or ethyl acetate, or dimethyl carbonate in THF solution haue produced high yields of the functionally substituted organosodium compounds [C5-H4 C(0)R] Na+, where R = H, CH3, or OCH3. These organosodium reagents have proved to be valuable intermediates in the formation of functionally substituted cobaltocene, nickel-ocene, etc., sandwich complexes as yell as for other n5-cyclopentadienyl-metal systems such as (n5-C5H4CH)M(CO)2 (M = Co, Rh) and (T|5-C_H, CH0)W(CD),CH The latter aldehydes can be readily converted into corresponding acrylate and vinyl derivatives. The polymerization chemistry of these neu organometallic monomers has been initiated.