1: With silver trifluoromethanesulfonate; (S)-(-)-2,2'-bis(diphenylphosphino)-1,1'-binaphthyl in toluene T=-50°C; 40 h; Inert atmosphere; 2: With 2,3-dicyano-5,6-dichloro-p-benzoquinone in benzene T=20°C; optical yield given as percent eestereospecific reaction;
