Preparation and characterization of magnetically separable MgFe<sub>2</sub>
O<sub>4</sub>
/Mg(OH)<sub>2</sub>
nanocomposite as an efficient heterogeneous catalyst for regioselective one-pot synthesis of β-chloroacetates from epoxides
Magneticallyseparable MgFe2O4/Mg(OH)2 nanoparticles were fabricated and characterized using various techniques. These nanoparticles were used as a new catalyst for regioselective one‐pot synthesis of β‐chloroacetates fromepoxides in the presence of NiCl2⋅6H2O and acetic anhydride. All reactions were carried out in ethanol at room temperature within 22–80 min giving the β‐chloroacetates in high to
磁分离MgFe 2 O 4 / Mg(OH)2纳米粒子的制备和表征使用各种技术。这些纳米颗粒被用作用于从氯化镍的存在下环氧化物区域选择性一锅合成β-氯乙酸的新的催化剂2 ⋅6H 2 O和乙酸酐。所有反应均在室温下于乙醇中进行22–80分钟,从而使β-氯乙酸盐的收率高至优异。使用外部磁体可以轻松分离纳米催化剂,并重复使用几次,而不会明显降低效率或磁性。
Intermolecular Halogenation/Esterification of Alkenes with <i>N</i>
-Halosuccinimide and Acetic Acid Catalyzed by 1,4-Diazabicyclo[2.2.2]octane
作者:Laura S. Pimenta、Elena V. Gusevskaya、Eduardo E. Alberto
DOI:10.1002/adsc.201700117
日期:2017.7.3
organocatalyst in the activation of N-chlorosuccinimide (NCS) towards the chlorination of alkenes. The chloriranium ion formed from NCS and the alkene, can be intermolecularly opened by a nucleophile, such as acetic acid, to produce highly functionalized trans-chloro esters in high yields. The protocol is also applied to the synthesis of chlorohydrins and chloro ethers using water or methanol as nucleophiles
Reactions du n=chloroparatoluenesulfonamidate de sodium (chloramine t) sur les olefines en miliu acide organique
作者:Bernard Damin、Jacques Garapon、Bernard Sillion
DOI:10.1016/s0040-4039(00)77816-6
日期:1980.1
Vic. chloro-acetoxy and vic. chloro-tosylamino alcanes are the main products of the electrophilic reaction of chloramine T on olefins in acetic acid. The stereochemistry of the acetoxy chloration of the 2-butenes and cyclohexene is trans.
Highly enantioselective acylation of chlorohydrins using Amano AK lipase from P. fluorescens immobilized on silk fibroin–alginate spheres
作者:Irlon M. Ferreira、Rodolfo H.V. Nishimura、Ana B. dos A. Souza、Giuliano C. Clososki、Sergio A. Yoshioka、André L.M. Porto
DOI:10.1016/j.tetlet.2014.07.032
日期:2014.9
kinetic resolution mediated by Amano AK lipase from Pseudomonasfluorescens immobilized in silk friboin-alginate spheres. Thus, the enantioselectivity of the process was sufficient for the production of the desired alcohols and acetates in good yields and high enantiomeric purities. This Letter provides a simple, cheap, and practical protocol for enantioselective synthesis of chlorohydrins and reinforces