The thermal degradation products of the 7\u3b1- and 7\u3b2-cholesteryl 3\u3b2-acetate hydroperoxides obtained by thermal oxidation of cholesteryl 3\u3b2-acetate are reported and discussed. The hydroperoxides were degraded in both the vapour and condensed phases. The main components identified were 7-ketocholesteryl 3\u3b2-acetate, 7\u3b1- and 7\u3b2-hydroxycholesteryl 3\u3b2-acetates and the products generated from the loss of the hydroperoxide group and/or of acetic acid. Remarkable is the finding of the epoxy-hydroxy derivatives of cholesteryl acetate among the degradation products
