piperic acid

Chem.: C12H1004=CH2O CH3C4H4COOH. A monobasic acid obtained by heating equal weights of piperine and pota ium hydrate in absolute alcohol for five hours at 100° in a closed ve el, and decomposing the pota ic pipe rate formed with dilute hydrochloric acid. In the moist state it is a jelly, but on drying it forms yellow needles, insoluble in water, soluble in alcohol, slightly soluble in ether, melts at 150°, and sublimes at 200°, partly unaltered. Its salts have the general formula, C12H9MO4. Ammonia piporate C12H9 (NH4) O4. forms colorle , satiny scales, resembling cholesterin. The barium salt obtained by precipitation crystallizes in microscopic needles, slightly soluble in cold, more so in hot water. The silver salt, C12H9AgO4, obtained by precipitating silver nitrate with pota ic pipe rate, is insoluble in water and alcohol.