On the basis of i.r. and chromatographic evidence 5α-cholestane-3α,7α,12α,24ξ,26-pentol(I) and 24ξ,26-oxido-5α-cholestane-3α,7α,12α-triol (IV) structures have been proposed for the principal cleavage and alkaline-hydrolysis products of the bile salts from Catostomus commersoni (Anderson & Haslewood, 1969). N.m.r.- and mass-spectral analyses of these substances and the tetra- (II) and penta-acetate (III) derivatives of (I) provided supporting evidence for the structural assignments.

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