The exo-selective C-H cycloaddition of imidazoles to 1,1-disubstitutedalkenes has been achieved for the first time by using half-sandwich scandium catalysts. A wide range of imidazole compounds bearing various 1,1-disubstituted aliphatic alkenes, styrenes, dienes and enynes have been selectively converted in high yields to the corresponding bicyclic imidazole derivatives bearing -all-carbon-substituted
Domino <i>N</i>-/<i>C</i>- or <i>N</i>-/<i>N</i>-/<i>C</i>-arylation of imidazoles to yield polyaryl imidazolium salts <i>via</i> atom-economical use of diaryliodonium salts
作者:Shiqing Li、Hongxu Lv、Yu Yu、Xiuqing Ye、Baisong Li、Songming Yang、Yanru Mo、Xiangfei Kong
DOI:10.1039/c9cc05237b
日期:——
Herein, we disclose a Cu-mediated domino di-/triarylation reaction of imidazoles to efficiently access polyaryl imidazolium salts in a single step by using two aryls as well as an anion of a diaryliodonium salt. The diarylation shows high atom economy and excellent selectivity with unsymmetrical iodonium salts.
Described herin are molecules for use in organic light emitting diodes. Example molecules comprise at least one acceptor moiety A, at least one donor moiety D, and optionally one or more bridge moieties B. Each moiety A is covalently attached to either the moiety B or the moeity D, each moiety D is covalently attached to either the moeity B or the moeity A, and each B is covalently attached to at least one moiety A and at least one moiety D. Values and preferred values of moieties A, D and B are defined herein.
Sterically Hindered <i>N</i>
-Heterocyclic Salts Utilized as Antimicrobial Agents
作者:Slindile N. P. Ndlovu、Halliru Ibrahim、Muhammad D. Bala
DOI:10.1002/jhet.2992
日期:2017.11
By the adoption of annulated ring systems for their steric bulkiness, a new series of symmetric N‐heterocyclic imidazolium and perimidium salts were synthesized. Also, corresponding asymmetric ferrocenyl N‐functionalized series were prepared as salts. All the reported salts were fully characterized. The reported X‐ray structure of 4,5‐diphenyl‐1,3‐dimethyl‐1H‐imidazol‐3‐ium iodide (2a) shows that it
通过采用环状环系统的空间体积,合成了一系列新的对称N杂环咪唑鎓和per鎓盐。此外,相应的不对称二茂铁基N-官能化系列也被制备为盐。所有报道的盐均已充分表征。报道的4,5-二苯基-1,3-二甲基-1 H-咪唑-3-碘化碘(2a)的X射线结构表明它在正交空间群P 2 1 2 1 2 1中结晶。两组盐对金黄色葡萄球菌的重要临床分离株均观察到低至中等的抗菌活性,枯草芽孢杆菌,粪肠球菌和大肠杆菌,铜绿假单胞菌和肠沙门氏菌。结果以美罗培南为基准。1,3-丙基-1H-菲[9,10 - d ]咪唑-3-碘化钾(3b)和1-二茂铁基-3-丙基-1 H -perimidin-3-碘化碘(9b)对所有测试的革兰氏阳性细菌菌株均显示出较高的抗菌活性,最低抑菌浓度范围为8至4μg/ mL(美洛培南= 0.5-0.125μg/ mL),而所有盐对革兰氏阳性菌几乎没有或没有活性。阴性细菌菌株。通常,不对称含二茂铁基的盐比对称盐具有更高的活性。
A Rapid and Efficient Way to Dynamic Creation of Cross-Reactive Sensor Arrays Based on Ionic Liquids
作者:Wei Zhu、Weina Li、Haowei Yang、Yin Jiang、Chen Wang、Yu Chen、Guangtao Li
DOI:10.1002/chem.201300789
日期:2013.8.26
Based on the simple counterion exchange of ionicliquids, a rapid, facile, and efficient strategy to create a cross‐reactive sensorarray with a dynamic tunable feature was developed, and exemplified by the construction of a sensorarray for the identification and classification of nitroaromatics and explosives mimics. To achieve a good sensing system with fast response, good sensitivity, and low detection