To provide a method for producing a benzene derivative useful as a synthetic intermediate of a medicine and an agrochemical, and a monomer for a polymer by reacting a specific metallacyclopentadiene, a specified metallic compound and specific acetylenes.
A metallacyclopentadiene of formula I [R1 to R4 are each an alkyl, an alkenyl, an alkynyl or the like; M is a transition metal; L is a ligand; (n) is 0-8] is reacted with 0.1-3 equivalent metallic compound of formula II [X is a halide ion, an alkyl or the like; M' is a transition metal or a typical metal (e.g. nickel and palladium); (m) and (y) are each 0-8] and acetylenes of formula III (R5 and R6 are each an alkyl, an alkenyl, an alkynyl or the like) preferably in the presence of a aprotic solvent (e.g. tetrahydrofuran) in an inert gas (e.g. nitrogen and argon) to provide the objective benzene derivative of formula IV in the method for producing the benzene derivative. The M in the compound of formula I is preferably zirconium or hafnium, and L is preferably cyclopentadienyl.
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