Chim. Acta, 47, 1961 (1964). iiidepeiideiit of the reaction conditions; however, it was found that only in neutral solution could pure IITa be obtuiiied by direct recrystallization of the reactiori mixture. Chromatography of the mother liquori yielded 28% of n mixture of isomer V (iii equilibrium with heniiketal 1-ketal TIb. The structure of VIb its spectral properties, it-coiiver arid> olutioii, and it< 1) reparatioii oil heatiiig 1-under refiuu\ nth p-tciluenesulfoiiic: wid iii ...
![[10-(hydroxymethyl)-13-methyl-17-oxo-1,2,3,4,5,6,7,8,9,11,12,14,15,16-tetradecahydrocyclopenta[a]phenanthren-3-yl] acetate结构式](https://image.chemsrc.com/caspic/161/17916-14-2.png)