5-hydroxy-5β-cholestan-3-yl acetate | 4947-62-0

• 分子结构分类: 有机化合物 - 脂质和类脂质分子 - 类固醇和类固醇衍生物
• 英文名称: 5-hydroxy-5β-cholestan-3-yl acetate
• 英文别名: 3β-Acetoxy-5β-cholestanol-(5)；3β-Acetoxy-5β-hydroxycholestan；acetic acid-(5-hydroxy-5β-cholestanyl-(3β)-ester)；(10R)-5c-Hydroxy-3c-acetoxy-10r.13c-dimethyl-17c-((R)-1.5-dimethyl-hexyl)-(8cH.9tH.14tH)-hexadecahydro-1H-cyclopenta[a]phenanthren；Essigsaeure-(5-hydroxy-5β-cholestanyl-(3β)-ester)；[(3S,5S,8S,9S,10R,13R,14S,17R)-5-hydroxy-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-1,2,3,4,6,7,8,9,11,12,14,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-yl] acetate
• CAS: 4947-62-0
• 化学式: C₂₉H₅₀O₃
• 分子量: 446.714
• InChiKey: XGBHFLNWQIPOQW-GEKZLSDOSA-N

计算性质

• 辛醇/水分配系数(LogP)：
  7.15
• 重原子数：
  32.0
• 可旋转键数：
  6.0
• 环数：
  4.0
• sp3杂化的碳原子比例：
  0.97
• 拓扑面积：
  46.53
• 氢给体数：
  1.0
• 氢受体数：
  3.0

反应信息

• 作为产物：
  描述：

  7β-hydroxycholesterol 、 乙酸酐 在 吡啶 作用下， 生成 5-hydroxy-5β-cholestan-3-yl acetate
  参考文献：
  名称：

  Method Comparisons for Particulate Nitrate, Elemental Carbon, and PM_2.5 Mass in Seven U.S. Cities

  摘要：

  Methods that measure PM2.5 mass, total particulate NO3-, and elemental carbon (EC) were evaluated in seven U.S. cities from 1997 to 1999. Sampling was performed in Bakersfield, CA; Boston, MA; Chicago, IL; Dallas, TX; Philadelphia, PA; Phoenix, AZ; and Riverside, CA. Evaluating and validating methods that measure the components of fine mass are important to the effort of establishing a speciation-monitoring network. The Harvard Impactor (HI), which measures fine particle mass, showed excellent agreement (r(2) = 0.99) With the PM,, Federal Reference Method (FRM) for 81 24-hr samples in Riverside and Bakersfield. The HI also showed good precision (4.8%) for 243 24-hr collocated samples over eight studies.The Aethalometer was employed in six of the sampling locations to measure black carbon (BC). These values were compared to EC as measured from a quartz filter using thermal analysis. For the six cities combined, the two methods were highly correlated (r(2) = 0.94; 187 24-hr samples); however, the BC values were approximately 24% less than the EC measurements consistently across all six cites. This compares well to results observed for EC/BC measurements observed in other semi-urban areas. Particulate NO3- was measured using the Harvard-EPA Annular Denuder System (HEADS). This was compared to the NO3- measured from the HI Teflon (DuPont) filter to assess NO3- artifacts. Significant NO3- losses (approximately 50% of total NO3-) were found in Riverside, Philadelphia, and Boston, while minimal artifacts were observed in the other sites. Two types of HEADS configurations were employed in five cities. One system used a Na2CO3-coated glass fiber filter, and the other type used a nylon filter to collect volatilized NO3- from the Teflon filter. The HEADS with the Na2CO3-coated filter consistently underestimated the total particulate NO3- by approximately 20% compared to the nylon HEADS.

  DOI：

  10.1080/10473289.2000.10464152