Mass spectral fragmentation of 24,24-diphenyl-23-ene derivatives of cholic acid.
After electron impact in the mass spectrometer, 24,24-diphenyl-23-ene derivatives of cholic acid ejected the 17-sidechain as an ionized 1,1-diphenyl-butadiene derivative, and the 12 alpha-acetoxy group activated this loss. This contrasts markedly with the mass spectrometric fragmentation of typical sterols having unsaturated 17-sidechains that are also devoid of functionality on the C-ring.
D055598:Chemical Phenomena; D002621:Chemistry; D002793:Cholic Acids / Q000032:analysis*; D006859:Hydrogen; D013058:Mass Spectrometry / Q000379:methods
D002793:Cholic Acids; D006859:Hydrogen