抄録
Permanganate oxidation of euphol (I), tirucallol (XII), and β-euphorbol was examined. Permanganate oxidation of I in acetone afforded colorless needles (III), m.p. 224∼225°, C27H44O3, while the same oxidation of β-euphorbol gave yellow needles (VI), m.p. 218∼220°, C27H40O5, besides III. Further oxidation of III with chronic acid in glacial acetic acid afforded yellow needles (VIII), m.p. 178°, C27H38O5. Permanganate oxidation of I in glacial acetic acid afforded VIII, which was also obtained by the same oxidation of β-euphorbol. The same oxidation of XII gives yellow needles (XIII), (efferv. with decomp. at around 215°), C27H40O5. From the nature of the so-called β-euphorbol, it was considered to be a mixed crystal or molecular compound of I and an aldehyde of C10 to C12.
