Calosterol, a sterol present in the milky juice of Calotropis gigantea

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Abstract
The dried residue from 425 ml. of the milky juice of C. gigantea yielded 20 gm. of unsaponifiable matter from which were obtained 5.96 gm. of a new sterol, calosterol, C28H44O, m.p. 202-203[degree], specific rotation in chloroform of [image]. 100.6[degree]. Calosterol gives a monobenzoate, m.p. 239-240[degree], [image] 121.6[degree] and a monoacetate, m.p. 211-212[degree], [image] 105[degree]; it contains 3 double bonds and differs in its color reactions from any other known sterol.

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