K<sub>2</sub>S<sub>2</sub>O<sub>8</sub> activation by glucose at room temperature for the synthesis and functionalization of heterocycles in water
作者:Joydev K. Laha、Mandeep Kaur Hunjan
DOI:10.1039/d1cc03777c
日期:——
sulfate radical anion, the utilization of this protocol in organic synthesis is rarely demonstrated. We reinvestigated selected K2S2O8-mediated known organic reactions that invariably require higher temperatures and an organic solvent. A diverse, mild functionalization and synthesis of heterocycles using the inexpensive oxidant K2S2O8 in water at room temperature is reported, demonstrating the sustainability
虽然在室温下使用葡萄糖进行过硫酸盐活化主要集中在硫酸根阴离子的动力学研究上,但很少证明该协议在有机合成中的应用。我们重新研究了选定的 K 2 S 2 O 8介导的已知有机反应,这些反应总是需要更高的温度和有机溶剂。据报道,在室温下,使用廉价的氧化剂 K 2 S 2 O 8在水中对杂环进行了多样化、温和的功能化和合成,证明了该方法的可持续性和广泛的范围。与用于过硫酸盐活化的传统方法不同,当前方法使用天然丰富的葡萄糖作为 K 2S 2 O 8活化剂,避免使用高温、紫外线、过渡金属或碱。
Infrared and nuclear magnetic resonance properties of benzoyl derivatives of five-membered monoheterocycles and determination of aromaticity indices
作者:Kyu Ok Jeon、Jung Ho Jun、Ji Sook Yu、Chang Kiu Lee
DOI:10.1002/jhet.5570400504
日期:2003.9
Benzophenones, 2-benzoylthiophenes, 2-benzoylpyrroles, and 2-benzoylfurans, which have substituents at m- and p-positions of the benzoyl ring were prepared and their ir and nmr spectra were obtained in 0.1 M chloroform-d solution. The chemical shift values of each series were plotted against the Hammett substituent parameters to give good correlation, with the exception of the ortho-Hs and -Cs. The
A novel one-pot synthesis of 2-benzoylpyrroles from benzaldehydes
作者:Ratnesh Sharma、Mangilal Chouhan、Vipin A. Nair
DOI:10.1016/j.tetlet.2010.02.054
日期:2010.4
We herein report a novel one-pot reaction for benzoylation of pyrrole. The key step in the reaction is generation of di(1H-pyrrol-1-yl)zirconium(IV) chloride complex which reacts with benzaldehydes and methyl benzoates to give 2-benzoylpyrroles as the major product.
Aroylation of Electron-Rich Pyrroles under Minisci Reaction Conditions
作者:Joydev K. Laha、Mandeep Kaur Hunjan、Shalakha Hegde、Anjali Gupta
DOI:10.1021/acs.orglett.0c00041
日期:2020.2.21
The development of Minisci acylation on electron-rich pyrroles under silver-free neutral conditions has been reported featuring the regioselective monoacylation of (NH)-free pyrroles. Unlike conventional Minisci conditions, the avoidance of any acid that could result in the polymerization of pyrroles was the key to success. The umpolung reactivity of the nucleophilic acyl radical, generated in situ
ORGANIC IRIDIUM COMPOSITIONS AND THEIR USE IN ELECTRONIC DEVICES
申请人:Chichak Kelly Scott
公开号:US20100051869A1
公开(公告)日:2010-03-04
The present invention provides compositions comprising at least one novel organic iridium compound which comprises at least one cyclometallated ligand and at least one ketopyrrole ligand. The organic iridium compositions of the present invention are referred to as Type (1) organic iridium compositions and are constituted such that no ligand of the novel organic iridium compound has a number average molecular weight of 2,000 grams per mole or greater (as measured by gel permeation chromatography). Type (1) organic iridium compositions are referred to herein as comprising “organic iridium complexes”. The novel organic iridium compositions are useful in optoelectronic electronic devices such as OLED devices and photovoltaic devices. In one aspect, the invention provides novel organic iridium compositions useful in the preparation of OLED devices exhibiting enhanced color properties and light output efficiencies.