Methyl 16-Hydroxy-8a, l5 (S)-oxy-8, 14, 15, 16-tetra-hydrosandaracopimarate (10). A solution of 200 mg of diol 8 in 100 mL of dry chloroform was saturated with hydrogen chloride gas and kept at room temperature for 48 h. It was mixed with 100 mL of water and the organic solution washed with a saturated sodium bicarbonate solution and with water and dried (NaaO,). It then was evaporated and the residue chromatographed on silica gel. ...
