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Material dealing with the chemistry, biochemistry, and biological activities of oxysterols is reviewed for the period 1987-1995. Particular attention is paid to the presence of oxysterols in tissues and foods and to their physiological relevance.

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analyzed on a diisodecyl phthalate column, two components in about equal amounts with retention times identical with those of 15 and 16 were found. Nmr and ir spectra of a mixture of authentic 15 and 1624 in the same ratio agreed with the spectra obtained from the preparative gc sample. Compound 13 could not be isolated free of 14, but the nmr of the mixture had the characteristic absorption of a 3,4-unsaturated ketone: nmr (CCh) 2.43 (CCH2C=0), 2.78 (CH=CHCH2C=0), 5.79 (CH=CH), the remaining CH2 was obscured by 14. An analytical sample of the monotosylhydrazone of 12 was recrystallized from methanol, mp 208.3-209.0°dec.