“…The residue was chromatographed using benzene to ether elution (10% step gradient) to give, in order of elution, a mixture of cholesta-3,s-diene (3) and cholesta-4,6-diene (4) (0.145 g), mp 78-80°C, identified by 'H and I3C nmr comparison with the spectra of the authentic separated isomers (10); cholestane-5a,6P-dio1 (5 3,4-secocholest-4-ene-3,6a-diol (8) (0.06 g) Table 2; SP-cholestane-3a,6P-diol (9b) (0.03 g), mp 148-150°C (lit. (21) mp 142-143.S°C), 'H nmr included signals at 6 3.4-3.85 (lH, br m, C-3P H) and 3.75 (lH, br s, Wl12 = 5 Hz, C-6a H) ppm; I3C nmr, see Table 2; SP-cholestane-3P,6a-diol(lOa) (0.016 g), mp 212-215°C; IH nmr included signals at 6 3.35-3.75 (lH, br m, C-3a H) and 4.10 (lH, br s, Wl12 = 12 Hz, C-6P H); 13 C nmr, see Table 2. Anal.…”