Isolation of Helminthosporol as a Natural Plant Growth Regulator and its Chemical Structure

摘要: Helminthosporol was isolated as a natural plant growth-regulator produced by Helminthosporium sativum and its structure assigned I. Oxidation of I with chromium trioxide-pyridine complex gave helminthosporal (II). The glycol (III), obtained the reduction or II, yielded oxidation activated manganese dioxide. spontaneously changed into helminthosporic acid (IV), when former in organic solvent let to stand air.