lead(IV) acetate; 1-amino-benztriazole in dichloromethane at -78°C; flash chromy. (benzene/hexane=1/8); N2 pressure; elem. anal.;

n-butyllithium in tetrahydrofuran; diethyl ether dropwise addn. of BuLi soln. to a suspn. of diene in Et2O at ice-bath temp. during 20 min, addn. of THF, dropwise addn. of germanium compd. soln. in THF during 45 min, stirring overnight at room temp., refluxing for4 h; hydrolysis, org. layer sepn., drying (Na2SO4), evapn., fractional distn.;

elem. anal.;

lead(IV) acetate; 1-amino-benztriazole in dichloromethane at -78°C; flash chromy. (benzene/hexane=1/8); N2 pressure; elem. anal.;

in benzene Irradiation (UV/VIS); irradn. (450 W Hg lamp, 3 h);