2-Chloropyridazin-3(2<i>H</i>)-ones as Electrophilic Chlorinating Agents: Effective α-Chlorination of Active Methylene/Methine Compounds
作者:Yong-Jin Yoon、Yong-Dae Park、Jeum-Jong Kim、Su-Dong Cho、Sang-Gyeong Lee、J. Russell Falck
DOI:10.1055/s-2005-861845
日期:——
2,4,5-Trichloro- (2a) and 2,4-dichloro-5-methoxypyridazin-3(2H)-one (2b) are novel electrophilic chlorinating agents. α-Chlorination of activemethylene/methinecompounds with 2 in the presence of either Lewis or protonicacids in dichloromethane (for Lewis acid) or water (for protonic acid or none) at room temperature gave also selectively α-monochlorides and/or a,a-dichlorides in good to excellent
Mild and Efficient α-Chlorination of Carbonyl Compounds Using Ammonium Chloride and Oxone (2KHSO<sub>5</sub>·KHSO<sub>4</sub>·K<sub>2</sub>SO<sub>4</sub>)
A simple protocol for the α-monochlorination of ketones and 1,3-dicarbonyl compounds utilizing NH4Cl as a source of chlorine and Oxone as an oxidant in methanol without catalyst is presented. The reaction proceeds at ambient temperature in yields ranging from moderate to excellent.
Base-mediated reactions of diethyl malonates derivatives with perfluorinated olefins: Novel synthetic routes to multifunctional ionomer precursors
作者:Sergey N. Tverdomed、Markus E. Hirschberg、Romana Pajkert、Gerd-Volker Röschenthaler
DOI:10.1016/j.jfluchem.2021.109864
日期:2021.10
unsubstituted diethyl malonate, the elimination is accompanied by a prototropic rearrangement with a double bond migration and the addition of a second equivalent of the C-nucleophile forming the tetrafunctional internal olefins. The reaction conditions, factors affecting the reactivity and regioselectivity of the process, the choice of reagent as well as the course of competitive reactions are also discussed
[EN] PROCESS FOR THE PREPARATION OF FLUOXASTROBIN AND INTERMEDIATES THEREOF<br/>[FR] PROCÉDÉ DE PRÉPARATION DE FLUOXASTROBINE ET SES INTERMÉDIAIRES
申请人:UPL LTD
公开号:WO2021250558A1
公开(公告)日:2021-12-16
The invention provides an improved process for the preparation of fluoxastrobin and intermediates thereof. The present invention provides a process for the preparation of fluoaxastrobin, 4,6-dichloro-5-fluoro-pyrimidine and diethyl 2-chloromalonate that are substantially free of unwanted impurities.