分子内链转移至聚合物和随后的叔自由基的传播引起丙烯酸单体的自由基聚合中的大量支化。文献研究表明,在受控的自由基聚合条件下,支化程度显着降低。有两种相互竞争的理论来解释这种效果。一方面,减少支化的原因是由于减少了咬合事件的数量,而在另一种已专门应用于原子转移自由基聚合(ATRP)的原因中,其原因是由于叔自由基被碳原子所捕获。快速停用步骤。在本文中,我们表明第三级自由基的捕获不是分支分数降低的原因。13 C NMR并通过能力链由聚(丙烯酸丁酯-延伸共丁基-2- bromoacrylate)通过ATRP共聚物。这些结果通过量子力学计算得到补充。
Decarboxylative Amination: Diazirines as Single and Double Electrophilic Nitrogen Transfer Reagents
作者:Preeti P. Chandrachud、Lukasz Wojtas、Justin M. Lopchuk
DOI:10.1021/jacs.0c09403
日期:2020.12.30
structure and functionality of the substrate to be aminated. Further, many of these reagents are challenging to handle, engage in undesired side reactions, and function only within a narrow scope. Here we report the use of diazirines as practical reagents for the decarboxylative amination of simple and complex redox-active esters. The diaziridines thus produced are readily diversifiable to amines, hydrazines
2-Azidoacrylamides as compact platforms for efficient modular synthesis
作者:Hinano Takemura、Sayuri Goto、Takamitsu Hosoya、Suguru Yoshida
DOI:10.1039/d0cc07212e
日期:——
Efficient methods to assemble modules with compact platform molecules by triazole formations and Michael reactions are disclosed. Good electrophilicity of 2-triazolylacrylamides realized Michael additions using various nucleophiles.
[EN] PROCESSES AND COMPOUNDS FOR THE DECARBOXYLATIVE AMINATION OF REDOX-ACTIVE ESTERS WITH DIAZIRINES<br/>[FR] PROCÉDÉS ET COMPOSÉS POUR L'AMINATION DÉCARBOXYLATIVE D'ESTERS À ACTIVITÉ REDOX AVEC DES DIAZIRINES
申请人:H LEE MOFFITT CANCER CT & RES
公开号:WO2020252457A1
公开(公告)日:2020-12-17
The invention described herein relates generally to processes for the synthesis of amine-containing organic compounds. More specifically, described herein relates to processes for the decarboxylative amination of redox-active esters with diazirines and the products formed thereof. Compounds for use in the above processes are also described.
with the kinetics of bromine addition to unsaturated compounds in presence of added bromide ions at 22, 30, 38, 46, and 54 °C. The substrates used were acrylamide (AAm), methyl acrylate (MA), ethyl acrylate (EA), butyl acrylate (BA), t-butyl acrylate (tBA), methacrylamide (MAAm), methyl methacrylate (MMA), ethyl methacrylate (EMA), methyl crotonate (MC), and ethyl crotonate (EC). The kinetics was followed
本文讨论了在 22、30、38、46 和 54 °C 下,在添加溴离子存在下,溴与不饱和化合物的加成动力学。所用基材为丙烯酰胺(AAm)、丙烯酸甲酯(MA)、丙烯酸乙酯(EA)、丙烯酸丁酯(BA)、丙烯酸叔丁酯(tBA)、甲基丙烯酰胺(MAAm)、甲基丙烯酸甲酯(MMA)、甲基丙烯酸乙酯(EMA) )、巴豆酸甲酯 (MC) 和巴豆酸乙酯 (EC)。通过电位测定法跟踪动力学。计算并比较激活参数(ΔH\eweq、ΔS\eweq和ΔG\eweq)。溴代醇与二溴化物的产物比率的估计表明产物形成与底物的反应性之间不存在任何相关性。观察到的参数与建议的反应机制有关。
A process for preparing 2-pyridinyloxyphenoxy-lower-alkanoates
申请人:Imperial Chemical Industries PLC
公开号:US04414391A1
公开(公告)日:1983-11-08
This invention relates to a process for preparing pyridyloxyphenoxypropanecarboxylic acids and their derivatives, and to intermediates useful in the process.