... products are proposed to be formed through the sequence 8 + e“ ;——' 8" (1) ._ {g .- s + PhCH=C(Br)Ph ._ s + (PhCH=C(Br)Ph) (2) k; (PhCH=C(Br)Ph)“ —> (PhCH=CPh)' + Br“ (3) 43 Ada Chemica Scandinavica A 41 ... Gatti, N., Pedersen, SU and Lund, H. Acta Chem. ... Chem. Soc. ...