2β, 3β-Dihydroxycholestan-6-ones and their derivatives were prepared and their stereo chemistry was studied. In 2β, 3β-dihydroxy-or 2β, 3β-diacetoxycholestan-6-ones, equilibrium mixture consisted of 5α-and 5β-compound at the ratioof 3 : 2. On the other hand, 5α-compound was found to be exclusively stable in 2β, 3β-dihydroxycholestan-6-one acetonides.