Supercritical methanol as solvent and carbon source in the catalytic conversion of 1,2-diaminobenzenes and 2-nitroanilines to benzimidazoles
作者:Zhuohua Sun、Giovanni Bottari、Katalin Barta
DOI:10.1039/c5gc01040c
日期:——
Benzimidazoles and N-methylbenzimidazoles were synthesized by simply heating 1,2-diaminobenzenes in supercritical methanol over copper-doped porous metal oxides.
苯并咪唑和N-甲基苯并咪唑是通过在掺铜多孔金属氧化物中超临界甲醇中加热1,2-二氨基苯合成的。
N-Substituted Formamides as C1-Sources for the Synthesis of Benzimidazole and Benzothiazole Derivatives by Using Zinc Catalysts
作者:Bhalchandra Bhanage、Deepak Nale
DOI:10.1055/s-0035-1560319
日期:——
An efficient and convenient one-pot protocol has been developed for the synthesis of a variety of benzimidazole, benzoxazole, and benzothiazole derivatives. This novel approach uses various o-phenylenediamines and N-substituted formamides (C1 sources) in a zinc-catalyzed cyclization in the presence of poly(methylhydrosiloxane) to afford the corresponding derivatives as sole products in moderate to
Carbon Dioxide Mediated Novel Synthesis of Quinazoline-2,4(1<i>H</i>,3<i>H</i>)-dione in Water
作者:Kalidas B. Rasal、Ganapati D. Yadav
DOI:10.1021/acs.oprd.6b00244
日期:2016.12.16
A novel, efficient, and scalable CO2 mediated synthesis of quinazoline-2,4(1H,3H)-dione was developed by a simple cyclization of 2-aminobenzonitrile with DMF in water as the solvent. This is the first report of its kind. DMF was used as the necessary carbon source in the synthesis of quinazoline-2,4(1H,3H)-dione. This synthetic protocol is very efficient; it gives >99% conversion with excellent selectivity
The present invention provides a continuous process for the epoxidation of an olefinic compound with an oxidant, which process comprises reaction of an olefinic compound with an oxidant in the presence of a catalyst in an apparatus that comprises
a reactive distillation column, which column comprises
(i) a reactive section, which comprises the catalyst
(ii) a rectifying section situated above the reactive section and adapted to allow separation of reagents and/or by-products from products
(ix) a stripping section situated below the reactive section and adapted to allow separation of product from reagents and/or by-products
(x) a vessel situated below the stripping section and adapted to provide a source of heat for the column and in which initial vaporisation of one or more of the reagents can occur,
wherein the temperature in the reactive section (i) is a temperature at which the reaction between the olefinic compound and the oxidant takes place and the temperature in the stripping section (iii) is higher than the temperature in the rectifying section (ii).
Retracted article: Design, synthesis, and study of benzobis- and bibenz(imidazolium)-based ionic liquid crystals
作者:Kelly M. Wiggins、Robert L. Kerr、Zheng Chen、Christopher W. Bielawski
DOI:10.1039/c0jm00417k
日期:——
The Royal Society of Chemistry hereby wholly retracts this Journal of Materials Chemistry article with the agreement of Christopher W. Bielawski and Kelly M. Wiggins (other co-authors could not be reached) due to data fabrication as detailed below. This retraction supersedes the information provided in the Expression of Concern related to this article. The Royal Society of Chemistry has been contacted by the corresponding author of this article and the Research Integrity Officer at The University of Texas at Austin regarding concerns of scientific misconduct affecting this article. The Research Integrity Officer has informed us that an investigation to ascertain the validity of the work reported has found that scientific misconduct by one of the articles co-authors has taken place as follows: the thermal plots in this article were falsified from original data – the enumerated figures do not accurately reflect the raw data. Specifically, the thermal data in Figure 2 was falsified. The thermal data in Supplementary Figures S1-S3 was also falsified. The original data in Figure 2 and Supplementary Figures S1-S3 was manipulated to make the peaks appear larger or smaller than they originally were. The signing authors would like to apologise for this and any consequent inconvenience to authors and readers. Signed: Christopher W. Bielawski and Kelly M. Wiggins, March 2015
皇家化学学会在此全权撤回与Christopher W. Bielawski和Kelly M. Wiggins达成一致的《材料化学杂志》文章(其他共同作者未能联系上),原因如下:数据伪造。此次撤回替代了与该文章相关的关注声明中提供的信息。该文章的通讯作者以及德克萨斯大学奥斯汀分校的研究诚信官已与皇家化学学会联系,提出了影响此文章的科学不端行为的担忧。研究诚信官告知我们,调查确认了报告中工作的有效性,发现一位共同作者存在以下科学不端行为:本文中的热图是基于原始数据伪造的——列举的图形并未准确反映原始数据。具体而言,图2中的热数据被伪造。补充图S1-S3中的热数据也被伪造。图2及补充图S1-S3中的原始数据被操控,使峰值看起来比实际大或小。签署的作者对此表示歉意,并对作者和读者造成的任何不便表示歉意。 签署者:Christopher W. Bielawski 和 Kelly M. Wiggins,2015年3月。