Synthesis of 6-deoxy-N-Cbz-d,l-iminoglycal-derived vinyl epoxides and examination of their regio- and stereoselectivity in nucleophilic addition reactions
作者:Valeria Di Bussolo、Annalisa Fiasella、Lucilla Favero、Ileana Frau、Paolo Crotti
DOI:10.1016/j.tet.2013.01.019
日期:2013.3
The regio- and stereoselectivity of the addition reactions of O-, C-, N-, and S-nucleophiles to 6-deoxy-d,l-iminoallal- and -d,l-iminogalactal-derived epoxides 2α and 2β was examined. Results indicated that the 1,4-/1,2-regioselectivity ratio and the related syn-1,4-/anti-1,2-stereoselectivity is closely and directly dependent on the ability of the nucleophile to coordinate with the oxirane oxygen
4,5‐Dihydro‐1,2,3‐oxadiazole: A Very Elusive Key Intermediate in Various Important Chemical Transformations
作者:Klaus Banert、Neeraj Singh、Benjamin Fiedler、Joachim Friedrich、Marcus Korb、Heinrich Lang
DOI:10.1002/chem.201502326
日期:2015.10.19
4,5‐Dihydro‐1,2,3‐oxadiazoles are postulated to be keyintermediates in the industrial synthesis of ketones from alkenes, in the alkylation of DNA in vivo, and in the decomposition of N‐nitrosoureas; they are also a subject of great interest for theoretical chemists. In the presented report, the formation of 4,5‐dihydro‐1,2,3‐oxadiazole and the subsequent decay into secondary products have been studied
推测4,5-二氢-1,2,3-恶二唑是从烯烃工业合成酮,体内DNA烷基化以及N-亚硝基脲分解的关键中间体。它们也是理论化学家非常感兴趣的主题。在本报告中,已通过NMR监测分析研究了4,5-二氢-1,2,3-恶二唑的形成及其随后降解为副产物的过程。现在,通过1 H,13 C和15 N NMR光谱以及在非常低的温度下进行的相关2D实验,已经证实了逃避特性难以捉摸的特性。我们用适当取代的N进行的实验在非极性条件下使用th(I)醇盐作为碱的亚硝基脲回答了有关4,5-二氢-1,2,3-恶二唑的存在及其副产物的重要问题。
메탄 활성화 촉매, 이를 이용한 메틸에스테르 제조방법
申请人:KOREA INSTITUTE OF SCIENCE AND TECHNOLOGY 한국과학기술연구원(319980077518) BRN ▼209-82-03522
公开号:KR20210098002A
公开(公告)日:2021-08-10
본 발명은 메탄을 산화시켜 메틸에스테르를 제조하기 위한 촉매와 방법에 관한 것으로, 본 발명에 따른 메탄 활성화 촉매는 낮은 온도와 약산의 조건 하에서 우수한 촉매활성을 나타낼 뿐만 아니라, 반복사용에도 촉매의 성능 저하가 거의 없으므로, 이를 통해 메탄으로부터 메탄올의 생산에 유리하다.
Synthesis of Modified Nucleoside Oligophosphates Simplified: Fast, Pure, and Protecting Group Free
作者:Jyoti Singh、Alexander Ripp、Thomas M. Haas、Danye Qiu、Manfred Keller、Paul A. Wender、Jay S. Siegel、Kim K. Baldridge、Henning J. Jessen
DOI:10.1021/jacs.9b08273
日期:2019.9.25
Phosphoramidite analogs of modified cyclotriphosphates provide a general and step-economical synthesis of nucleoside triphosphates and analogs on scale without need for protecting groups. These reagents enable rapid access to pure nucleoside oligophosphates and a range of other analogs that were previously difficult to obtain (e.g. NH, CH2, CCl2 and CF2 replacements for O, phosphono- and phospho-imidazolides
AbstractNew salts based on imidazolium, pyrrolidinium, phosphonium, guanidinium, and ammonium cations together with the 5‐cyanotetrazolide anion [C2N5]− are reported. Depending on the nature of cation–anion interactions, characterized by XRD, the ionic liquids (ILs) have a low viscosity and are liquid at room temperature or have higher melting temperatures. Thermogravimetric analysis, cyclic voltammetry, viscosimetry, and impedance spectroscopy display a thermal stability up to 230 °C, an electrochemical window of 4.5 V, a viscosity of 25 mPa s at 20 °C, and an ionic conductivity of 5.4 mS cm−1 at 20 °C for the IL 1‐butyl‐1‐methylpyrrolidinium 5‐cyanotetrazolide [BMPyr][C2N5]. On the basis of these results, the synthesized compounds are promising electrolytes for lithium‐ion batteries.