Mercuric triflate-(TMU)3-catalyzed cyclization of ω-arylalkyne leading to dihydronaphthalenes

Efficient arylyne cyclization catalyzed by the Hg(OTf)(2)-(TMU)(3) complex has been developed. The reaction was carried out at ambient temperature in acetonitrile, and the catalytic cycle reaches up to 1000 turnovers.