Ueber krystallisirtes Veratrin

Toglic And Angelic Acids

“…Various lists of the melting points of solid derivatives of tiglic and angelic acids have been published (96,116,162), but no complete fist is available. In table 2 are given the melting points of all of the solid derivatives which seem to TABLE 1 Physical properties of tiglic acid, angelic acid, and derivatives and of analogously t…”

“…Even in recent years this name for tiglic acid is sometimes encountered (53). Further investigation of cevadilla showed that the acid was in the form of an alkaloid ester, cevadine, which could also be isolated from Veratrum album L. The acid isolated from the saponification of the alkaloid has been reported to be tiglic acid (95,200), angelic acid (1,169), and a mixture of the two (81,158). The most reasonable explanation of such discrepancies, which are common among the reports on these acids, is the isomerization of angelic acid to tiglic acid which has been observed to take place under conditions of saponification or acid hydrolysis, especially when fairly high temperatures were used (56,65,73,75).…”