Comparison of the 1H and 13C chemical shift data of bryonolic acid (D : C‐friedoolean‐8‐en‐3β‐ol‐29‐oic acid) and its derivatives (13 species) revealed that the conformational features of these compounds in CDCl3 solution depend on whether the functional groups at C‐29 are trigonal, such as COOCH3, or tetrahedral, such as CH2OH. In order to study the conformational features of these two groups of compounds
溴酚酸(D:C-friedoolean-8-en-3β-ol-29-oic酸)及其衍
生物(13种)的1H和13C
化学位移数据的比较揭示了这些化合物在CDCl3溶液中的构象特征取决于 C-29 处的官能团是三方的,如 COOCH3,还是四面体的,如 CH2OH。为了研究这两组化合物的构象特征,D : C-friedoolean-8-en-29-oic acid, D : C-friedoolean-的甲酯的 E 环上的质子之间的邻位耦合常数测量了 8-en-29-oic 及其
醋酸盐。结果与 S 型(D-E 环:船-船型)和 F 型(D-E 环: