Chemical examination of plant insecticides. Part VII. Further study of some amorphous fractions from the root-bark of Tephrosia lanceolata Grah.

Abstract

The results obtained by a more detailed study of some of the amorphous fractions described in the previous communication on the root bark of Tephrosia lanceolata are herein recorded. Treatment of the amorphous residues after separation of Substance I (renamed Lanceolatin A), Substance II and Substance III (renamed Lanceolatin B) with methanolic potassium hydroxide has enabled the isolation of another crystalline substance, now named Lanceolatin C and further quantities of Lanceolatin B. Lanceolatin C is biologically inactive (fish test). The alkali-soluble portion of the chloroform extract of the root bark was also found to contain a small amount of Lanceolatin C. Several other active and inactive amorphous fractions are also described.