Et3N in diethyl ether byproducts: Et3NHCl; Schlenk technique, N2; Pb-compd. addn. to dithiol soln., Et3N soln. addn. dropwise, mixt. stirring at room temp. 18 h in flask wrapped with Al foil, filtration, solvent removal, ppt. treatment with H2O, residue dissoln. (CH2Cl2/CH3CN), drying (Na2SO4); soln. filtration, solvent removal; elem. anal.;

in acetone (exclusion of light; Ar); soln. of dithiol in acetone is added to a soln. of Ph2Pb(OAc)2 in acetone at temperatures between 0 and -30°C; after 10 to 30 min stirring product is filtered off, filtrate is concd. in vac. at 0 to -10°C, pptn., recrystn. from CHCl3, elem. anal.;