chlorine

in diethyl ether (1) Grignard reagent prepd. from Mg and iso-C5H11Br in dry ether, (2) suspn. of anhyd. HgCl2 in dry ether added, stirred and refluxed for 8 h; cold H2O added, filtered, ice H2O added, ethereal layer sepd., evapd., recrystd. (EtOH);