in methanol byproducts: AgCl; heated to reflux for 15 min; cooled, filtered, concd., addn. of an aq. soln. of NaClO4, pptn. filtered off, washed with diethyl ether, recrystn. (water or water-methanol 9:1); elem. anal.;

in methanol byproducts: AgCl; heated to reflux for 30 min; cooled, filtered, concd., addn. of an aq. soln. of NaClO4, pptn. filtered off, washed with diethyl ether, recrystn. (water or water-methanol 9:1); elem. anal.;