dibenzoyl peroxide in diethyl ether under N2; to soln. of tribenzylstannane and 1-ethynyl-1-cycloheptanol (1:1 mol) in Et2O added dibenzoyl peroxide; stirred 20 h with condenser equipped with CaCl2-tube; Et2O evapd.; crystn. from EtOH; filtered from (PhCH2)3SnSn(CH2Ph)3; elem. anal.;

in tetrachloromethane soln. of I2 (1 mol) in CCl4 added dropwise at 18°C to soln. of (Z)-1-(2-(tribenzylstannyl)vinyl)-1-cycloheptanol (1 mol) in CCl4 with stirring; after addn. of I2 mixt. was kept 6 h at room temp.; solvent evapd.; crystn. from cyclohexane; elem. anal.;

in tetrachloromethane soln. of Br2 (1 mol) in CCl4 added dropwise at -10°C to soln. of (Z)-1-(2-(tribenzylstannyl)vinyl)-1-cycloheptanol (1 mol) in CCl4 with stirring; after addn. of Br2 react. mixt. was kept 4 h at room temp.; solvent evapd.; crystn. from cyclohexane; elem. anal.;

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.;