A rhodium-catalyzed annulative reaction between azobenzenes and nitrosoarenes has been developed, leading to a series of phenazines in moderate to good yields. This procedure proceeds with sequential chelation-assisted addition of aryl C–H to nitrosoarenes and ring closure by electrophilic attack of azo group to aryl. During this transformation, the azo group served as not only a traceless directing
An umpolung strategy for rapid access to thermally activated delayed fluorescence (TADF) materials based on phenazine
作者:Huaxing Zhang、Qiang Guo、Hu Cheng、Chunhao Ran、Di Wu、Jingbo Lan
DOI:10.1039/d1cc06705b
日期:——
radical nucleophilic addition/rearrangement of 2-aryl diazaboroles has been accomplished for the first time to construct phenazine structures. This protocol is an umpolung strategy based on the classical electrophilic mechanism, and therefore, a reversed regioselectivity was observed, which provides an opportunity to prepare sterically hindered phenazines. The resulting thermally activated delayed fluorescence
electro-oxidative synthesis as the general protocol for procuring phenazines under mild reaction conditions. Using aerial oxygen as an oxidant, inexpensive electrolyte, and electrodes, a diverse range of phenazines have been accessed in good yields via the ring contraction of 10,11-dihydro-5H-dibenzo[b,e][1,4]diazepines. In addition, the syntheses of phenazines and diamino phenazines via direct electro-oxidation
我们在此公开电氧化合成作为在温和反应条件下获得吩嗪的一般方案。使用空气中的氧气作为氧化剂、廉价的电解质和电极,通过 10,11-dihydro-5 H -dibenzo[ b,e ][1,4]diazepines的环收缩以良好的收率获得了多种吩嗪. 此外,还分别通过二氢吩嗪的直接电氧化和邻苯二胺的电二聚反应合成了吩嗪和二氨基吩嗪。
Teuber; Staiger, Chemische Berichte, 1955, vol. 88, p. 802,813
作者:Teuber、Staiger
DOI:——
日期:——
POLYMER HAVING THIENO[3,2-b] THIOPHENE MOIETIES
申请人:Li Yuning
公开号:US20090124788A1
公开(公告)日:2009-05-14
A polymer comprising one or more types of repeat units, wherein the polymer includes a substituted thieno[3,2-b]thiophene component A and a different component B in the same type of repeat unit or in different types of repeat units, and wherein the polymer excludes a substituted or unsubstituted thieno[2,3-b]thiophene moiety. The polymer can be used as a semiconductor in electronics such as in organic thin film transistors.