in chloroform Irradiation (UV/VIS); N2; Sn-compd. soln. irradiation with 300 W high-pressure Hg lamp throughsatd. aq. CuSO4 soln. for 1 h, solvent evapn. (reduced pressure); TLC(PLC) (hexane/DCM 9:1); total yield 55 percent, E/Z ratio 53:47; elem. anal.;

in benzene Irradiation (UV/VIS); N2; Sn-compd. soln. irradiation with 300 W high-pressure Hg lamp throughsatd. aq. CuSO4 soln. for 1 h, solvent removal (reduced pressure); E/Z ratio 94:6;