...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >The structural and stereogenic properties of pentaerythritoxy-bridged cyclotriphosphazene derivatives: spiro-spiro,spiro-ansa and ansa-ansa isomers
【24h】

The structural and stereogenic properties of pentaerythritoxy-bridged cyclotriphosphazene derivatives: spiro-spiro,spiro-ansa and ansa-ansa isomers

机译：季戊四氧基桥联的环三磷腈衍生物的结构和立体学性质：螺-螺，螺-安沙和安沙-安沙异构体

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Reactions of pentaerythritol with hexachlorocyclotriphosphazene,N_3P_3C1_6,and gem-disubstituted cyclotriphosphazene derivatives,N_3P_3Cl_4R_2 [R = Ph,NHBu~t or (OCH_2CF_2CF_2CH_2O)_(0.5)] gave a series of pentaerythritol-bridged derivatives linked spiro-spiro,spiro-ansa and ansa-ansa.The structures and stereogenic properties of the products were characterised by X-ray crystallography and ~(31)P NMR spectroscopy on addition of the chiral solvating agent,(S)-(+)-2,2,2-trifluoro-l-(9-anthryl)ethanol.Molecules with spiro-spiro and spiro-ansa bridged gem-disubstituted cyclophosphazenes [R = Ph,NHBu~t or (OCH_2CF_2CF_2CH_2O)_(0.5)] are found to be chiral and exist as racemates.Molecules with ansa-ansa bridged cyclophosphazenes [R = Cl or (OCH_2CF_2CF_2CH_2O)_(0.5)] have been characterised for the first time and are shown to have meso configurations.Analysis of crystal structure data shows that the six-membered chair form of the spiro rings and the eight-membered boat-chair form of the ansa rings in the bridged compounds are similar to analogous spiro and ansa exocyclic ring conformations of 1,3-propanedioxy-derivatives of cyclophosphazenes.
机译：季戊四醇与六氯环三磷腈N_3P_3C1_6和宝石二取代的环三磷腈衍生物N_3P_3Cl_4R_2 [R = Ph，NHBu〜t或（OCH_2CF_2CF_2CH_2O] _（0.5）]的反应产生了一系列季戊四醇桥连的衍生物，连接了螺-螺并螺螺通过添加手性溶剂化剂（S）-（+）-2,2,2-三氟的X射线晶体学和〜（31）P NMR光谱对产物的结构和立体感进行表征-1-（9-蒽）乙醇。具有螺-螺和螺-螺杂的双取代的环磷腈[R = Ph，NHBu〜t或（OCH_2CF_2CF_2CH_2O_2 _）_（0.5）]的分子被发现是手性的，并以消旋体形式存在首次对具有ansa-ansa桥接环磷腈[R = Cl或（OCH_2CF_2CF_2CH_2O] _（0.5）]的分子进行了表征，并显示其具有内消旋构型。晶体结构数据分析表明，六元椅形式螺旋环和ansa的八人船椅形式桥连化合物中的环类似于环磷腈的1，3-丙烷二氧基衍生物的类似螺环和ansa环外构象。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号