Structure determination of diacholestanes. Their geochemical significance
作者:Odette Sieskind、Jean P. Kintzinger、Bernard Metz、Pierre Albrecht
DOI:10.1016/0040-4020(94)01063-6
日期:1995.2
(diacholestanes) were synthesized and their structures completely determined by X-ray diffraction and NMR. Four of them, the (20R + 20S) 13β(H), 17α(H)- and (20R + 20S) 13α(H), 17β(H)-diacholestanes are identical with the major C-27 geodiacholestanes. The two other isomers, the (20R) 13α(H), 17α(H)- and 13β(H), 17β(H)-diacholestanes, have not yet been found in geological samples.
合成了六个异构体重排的胆甾烷(二胆甾烷),并通过X射线衍射和NMR完全确定了它们的结构。其中的四个(20 R + 20 S)13β(H),17α(H)-和(20 R + 20 S)13α(H),17β(H)-二胆甾烷与主要的C-27大地胆甾烷相同。尚未在地质样品中发现其他两种异构体,即(20 R)13α(H),17α(H)-和13β(H),17β(H)-二胆甾烷。