in diethyl ether mixt. of Ph5Sb and Bi sulfonate in ether kept for 48 h at 20°C; ppt. filtered, washed (hexane), dried; ethereal and hexane soln. evapd.,recrystd. from EtOH;

in diethyl ether mixed, stirred for 12 h at 20°C, evapd.; recrystd. (water), elem. anal.;