Studies on Limonin. VII

Some Observations on the Partial Constitution of Limonin

Abstract

Some attempts were made to elucidate the partial structure of limonin by the summarization of known facts and reëxaminations were made on few points. Starting with etiolimonic acid, the ozonolytic product of limonin, desoxyetio-limonic acid and dihydroetiolimonic acid were newly prepared in crystalline state. Examination of the infrared absorption spectra of limonin derivatives reconfirmed the presence of a lactone, carbonyl, and an oxime, and the presence of a hydroxyl group in dihydroetiolimonic acid and dihydrolimonin.