2-[1-(Benzyl­phenyl­phosphinothio­yl)-2-phenyl­ethyl]-2'-[(E)-2-chloro­vinyl]-1,1'-binaphth­yl

The title compound, C₄₃H₃₄ClPS, is an unexpected reaction product that formed in the benzyl­ation of a dinaphthophos­phepine sulfide after addition of dichloro­methane in the presence of a strong base. It contains the rare functional group 2-chloro­vinyl in an E configuration, with C-C bond lengths of 1.471 (2) and 1.321 (2) Å, and a C-Cl bond length of 1.725 (2) Å.