28-nor-17ξ-olean-13(18)-ene | 13843-90-8

• 分子结构分类: 有机化合物
• 英文名称: 28-nor-17ξ-olean-13(18)-ene
• 英文别名: 28-Nor-17ξ-olean-13(18)-en；28-Nor-17ξ-oleanen-(13(18))；Oleanen III；(4aS,6aR,6bS,14aR,14bS)-4,4,6a,6b,11,11,14b-heptamethyl-2,3,4a,5,6,7,8,8a,9,10,12,13,14,14a-tetradecahydro-1H-picene
• CAS: 13843-90-8
• 化学式: C₂₉H₄₈
• 分子量: 396.7
• InChiKey: ZCKIHXFLRYDAPV-AJTPIMCUSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  8.95
• 重原子数：
  29.0
• 可旋转键数：
  0.0
• 环数：
  5.0
• sp3杂化的碳原子比例：
  0.93
• 拓扑面积：
  0.0
• 氢给体数：
  0.0
• 氢受体数：
  0.0

反应信息

• 作为产物：
  描述：

  3.21.22-Tris-(didehydro)-entagensaeure-methylester 在 盐酸 、 汞 、 锌 作用下， 以 乙醇 为溶剂， 生成 28-nor-17ξ-olean-13(18)-ene
  参考文献：
  名称：

  Triterpeniods-XXV：entagenic酸新三萜皂甙元从宪法榼藤子梅里尔

  摘要：

  菜豆酸的结构是一种新的三萜类皂苷元，它是从菜豆虫的种子仁中分离出来的，已被确定为3β，21α，22α-三羟基油烷-12-ene-28-oic酸。

  DOI：

  10.1016/0040-4020(67)85103-2

文献信息

• Zur Kenntnis der Triterpene. 149. Mitteilung. Überführung von Betulin und Oleanolsäure in isomere ungesättigte Kohlenwasserstoffe C₂₉H₄₈. Hypothese über die Biosynthese pentacyclischer Triterpene
  作者：P. Dietrich、O. Jeger

  DOI：10.1002/hlca.19500330336

  日期：——

  Es wurde die Herstellung der isomeren ungesättigten Kohlenwasserstoffe IX, XXIV und XXV aus dem Triterpendiol Betulin (I) und der Oleanolsäure (II) beschrieben und eine Hypothese über die Biosynthese pentacyclischer Triterpene aufgestellt.

  描述了由三萜二醇甜菜碱（I）和齐墩果酸（II）生产异构体不饱和烃IX，XXIV和XXV，并对五环三萜的生物合成进行了假设。
• 104. Sapogenins. Part XV. Siaresinolic acid
  作者：Philip Bilham、George A. R. Kon、Walter C. J. Ross

  DOI：10.1039/jr9420000540

  日期：——
• Winterstein; Stein, Justus Liebigs Annalen der Chemie, 1933, vol. 502, p. 223,234
  作者：Winterstein、Stein

  DOI：——

  日期：——
• Focus group composition: a comparison between natural and constructed groups
  作者：Julie Leask、Penelope Hawe、Simon Chapman

  DOI：10.1111/j.1753-6405.2001.tb01838.x

  日期：2001.4

  Objective: To provide insight into the effects of focus group composition.Method: In an early phase of an ongoing study of parental reception to messages about childhood immunisation, we conducted four focus groups; two with participants who had never met before (constructed groups) and two with participants who were part of a preestablished first-time mothers' group (natural groups).Results: Marked differences were noted in the group dynamics, depth of interaction and diversity between groups. Discussions with constructed groups were animated, enthusiastic, expressed more divergent views and articulated greater complexities of the topic. Discussions with natural groups were generally flatter and less enthusiastic, displaying a higher level of apparent conformity to conventional wisdom. The need to protect other participants from potentially disturbing information about vaccination was expressed across groups but acted to censor natural groups, where participants knew more of each others' sensitivities.Implications: Insight into the factors contributing to such differences may enhance understanding of the contexts in which constructed groups are more appropriate. The processes of social censorship may be of primary interest to the researcher. However, where it is paramount to elicit a range of opinions about a potentially controversial topic, we suggest that natural groups in the delicate stage of norming be avoided. The peculiarities of each individual research circumstance are best explored in pilot studies.
• Saponins and Sapogenins. XXX. The Isomeric Norechinocystenediones and Some Related Compounds^1a
  作者：F. A. Alves、C. R. Noller

  DOI：10.1021/ja01136a021

  日期：1952.8