in tetrahydrofuran; hexane Ar-atmosphere; MeMgCl soln. (THF) addn. (0°C), stirring (room temp., 20 h), evapn. (reduced pressure); extg. (hexane), filtering, evapn. (reduced pressure); elem. anal.;

in diethyl ether; toluene Ar-atmosphere; BnMgCl soln. (Et2O) addn. (0°C), stirring (room temp., 16 h), evapn. (reduced pressure); extg. (hexane), filtering, concg. (reduced pressure), crystn. (-20°C, 2 d); elem. anal.;