dibenzoyl peroxide

KOH in water byproducts: KCl, H2O; continous purging with N2; K2PtCl4 was added to the soln. of phosphite and KOH at 70°C until red colour persisted for more than 1 min; several min at 70-80°C until turns colourless; crystn. on cooling, washing with ethanol/water, vac. drying;

triethylamine T=100°C;

triethylamine; triethyl phosphite

sulfur in toluene Addition; sulfurization; 6 h; Heating;