Piperazine → HCID 19792942, compound

Participants

Reaction Steps

Piperazine (86.15 g., one mole) and ethanol (150 g. plus 1.5 g. water) were placed in a one liter 3-neck flask equipped with a stirrer, thermometer, dropping funnel and condenser. The mixture was stirred until a complete solution was obtained and then epichlorohydrin (92.53 g., one mole) was added dropwise while maintaining the temperature below 25° C., by means of an ice bath. After addition of the epichlorohydrin was complete, the temperature was maintained below 25° C. for an additional 30 minutes. Then a solution of 56.11 g. (1 mole) of potassium hydroxide in 225 g. of ethanol was added over a period of 30 minutes while maintaining the temperature below 25° C. After cooling to 15° C. the potassium chloride which had formed during the reaction was filtered from the mixture and the filtrate concentrated to 1/2 its volume by stripping under vacuum. One liter of ethyl acetate was then added to the residual filtrate. The N-glycidylpiperazine oligomer precipitated as a white solid. The resultant slurry was filtered after standing several hours. The N-glycidylpiperazine oligomer collected on the filter after drying in vacuo at room temperature amounted to 119 grams, 83.8% of the theoretical yield. Elemental analysis indicated: %C, 56.09; %H, 9.55; %N, 18.55; %O 15.77. The number average molecular weight as determined by vapor pressure osmometry was 705. This data corresponds to the formula: ##STR5##

Provenance & Evidence