Direct oxidation of the parent sterol using CrO3 provided (24R)-24-ethyl-5-cholesten-3-one which on treatment with NaBT4 gave [3 alpha-3 H] (24R)-24-ethyl-5-cholesten-3 beta-ol. Purification at each stage afforded samples which were compared spectrally with the corresponding cholesterol series compounds.

Direct oxidation of the parent sterol using CrO2 provided (24R)-24-ethyl-5-cholesten-3-one which on treatment with NaBT4 gave [3α-3H] (24R)-24-ethyl-5-cholesten-3β-ol. Purification at each stage afforded samples which were compared spectrally with the corresponding cholesterol series compounds.