We have demonstrated that the reaction of benzene-bridged bis (propargyl alcohol) s with chlorodialkylphosphines exclusively afforded 3, 8-bis (dialkylphosphinyl) naphtho [b] cyclobutenes via the [2+ 2] cycloaddition of 1, 2-bis (α-phosphinylallenyl) benzenes. Dephosphinylation of the product has also been achieved.