Benzylidene-methylethylketone Preparation

A mixture of 130 grams of methylethylketone, and 140 grams of benzaldehyde, with a solution of 50 grams of sodium hydroxide in 1500 CCS. of water, was shaken on a machine for eight days. The oil which separated was extracted with ether, and after evaporation of the latter the residue was distilled in a current of steam. When the benzaldehyde ceased coming over, the residue in the flask was subjected 

The oil which now distilled solidified after short standing, and the solid, when recrystallized from petroleum ether, melted at 38°-39 C. 

Towards the end of the operation the distillate contained a smali quantity of another compound which melted at 81 °- 83° C. 

A mixture of 15 grams of methylethyl-ketone and 50 grams piperonal with 750 cc. of dilute aqueous solution of sodium hydroxid was shaken mechanically for seven days. The yellow oily solid, whirl separated, was filtered, washed with water, and recrystallized sever times from petroleum ether. It consisted of nearly colourless plate, which melted at 101-102° C. 

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