hydrogenchloride in diethyl ether to stirred suspn. of SnCl2 in 3-pentene-2-one and Et2O added HCl in 10 h; evapd. in vac., extd. with cold CHCl3, evapd.;

hydrogenchloride in diethyl ether HCl passed 8 h into stirred suspn. of Sn in 3-pentene-2-one and Et2O; evapd. in vac., extd. with cold CHCl3, evapd.;

hydrogenchloride; acetone in diethyl ether HCl passed 5 h into stirred suspn. of Sn in acetone, acetaldehyde and Et2O; ratio of products depended on ratio of educts; filtered, filtrate concd., extd. with cold CHCl3;