This paper describes how benzene derivatives were formed with high selectivity in one-pot from three different alkynes in excellent yields. Firstly, a novel method for pair-selective coupling of an alkyne with ethylene forming zirconacyclopentenes was developed; then, highly selective cross-coupling of two different alkynes forming zirconacyclopentadienes was achieved; finally, transmetallation of Zr- C bonds to Cu-C bonds in the presence of a third alkyne led to the formation of benzene derivatives of three different alkynes. New evidences were obtained for understanding the reaction mechanism.

Key words: METALLOCENES, ZIRCONIUM COMPLEX, ALKYNE, BENZENE P