• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Chemistry: A European journal >Syntheses and fully diastereospecific photochromic reactions of thiophenophan-1-enes with chiral bridges
【24h】

Syntheses and fully diastereospecific photochromic reactions of thiophenophan-1-enes with chiral bridges

机译：带有手性桥的噻吩-1-烯的合成和完全非对映特异性光致变色反应

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

Thiophenophan-1-enes with chiral polyether bridges were prepared and their diastereospecific photochromic reactions were studied. The coupling reaction of substituted dithienylethenes and various chiral synthons afforded thiophenophan-1-enes, namely, bridged dithienylethenes, as single enantiomers without optical resolution, thus indicating that these reactions occurred diastereoselectively. Upon UV irradiation, each optically active thiophenophan-1-ene isomerized to the corresponding enantiomer of the closed form and returned to the initial enantiomer of the open form upon visible irradiation. Because thiophenophan-1-enes never isomerized to other diastereomers even at a high temperature, they underwent diastereospecific photochromic reactions. Large changes were observed in the measurement of the optical rotations of the solutions of thiophenophan-1-enes at 588 nm according to their photochromic reactions. As there was no absorption at this wavelength for both isomers of each thiophenophan-1-enes, the nondestructive readout of the photochromic reaction could be carried out by using these chiral thiophenophan-1-enes. Photo finish: Photochromic reactions of thiophenophan-1-enes with chiral polyether bridges occurred completely in a diastereospecific manner, even at high temperatures. Circular dichroism spectra and optical rotations changed photoreversibly according to the photochromic reactions between the enantiomers of the photoisomers (see figure).
机译：制备了具有手性聚醚桥的噻吩菲-1-烯，并研究了它们的非对映特异性光致变色反应。取代的二噻吩基乙烯与各种手性合成子的偶合反应提供了噻吩菲-1-烯，即桥接的二噻吩基乙烯，为单一对映体，没有光学拆分，因此表明这些反应是非对映选择性的。在紫外线照射下，每个旋光的噻吩-1-烯异构化成相应的封闭形式的对映异构体，并在可见光照射下返回到开放形式的初始对映异构体。因为噻吩-1-烯即使在高温下也从未异构化成其他非对映异构体，因此它们经历了非对映异构的光致变色反应。根据噻吩-1-烯的溶液的光致变色反应，在他们的旋光度测量中，在588 nm下观察到了很大的变化。由于每个噻吩-1-烯的两个异构体在该波长下均没有吸收，因此可以通过使用这些手性噻吩-1-烯进行光致变色反应的无损读出。照片处理：即使在高温下，噻吩菲-1-烯与手性聚醚桥的光致变色反应也完全以非对映异构的方式发生。圆二色性光谱和旋光度根据光异构体对映异构体之间的光致变色反应发生光可逆变化（见图）。

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