in tetrachloromethane soln. of ICl (2 mol) in CCl4 added dropwise at 0°C to soln. of (Z)-1-(2-(tribenzylstannyl)vinyl)-1-cycloheptanol (1 mol) in CCl4 with stirring; after addn. of ICl react. mixt. was kept 8 h at room temp.; solvent evapd.; crystn. from cyclohexane/CCl4 (1:1 v/v); elem. anal.;