A palladium [2+ 2] cycloaddition of 1, 6-and 1, 7-allenyne carboxylates and microwave- mediated [2+ 2] cycloaddition of various 1, n-allenynes were developed and, particularly, the microwave irradiated [2+ 2] cycloaddition of allenynes can provide a simple, general and eco-friendly synthetic method to fused bicyclo [m, 2, 0] alkadienes.