Aromatic substitution in ball mills: formation of aryl chlorides and bromides using potassium peroxomonosulfate and NaX
作者:Robert Schmidt、Achim Stolle、Bernd Ondruschka
DOI:10.1039/c2gc16508b
日期:——
Aryl chlorides and bromides are formed from arenes in a ball mill using KHSO5 and NaX (X = Cl, Br) as oxidant and halogen source, respectively. Investigation of the reaction parameters identified operating frequency, milling time, and the number of milling balls as the main influencing variables, as these determine the amount of energy provided to the reaction system. Assessment of liquid-assisted grinding conditions revealed, that the addition of solvents has no advantageous effect in this special case. Preferably activated arenes are halogenated, whereby bromination afforded higher product yields than chlorination. Most often reactions are regio- and chemoselective, since p-substitution was preferred and concurring side-chain oxidation of alkylated arenes by KHSO5 was not observed.
Chlorination of Aromatic Compounds with Chlorous Acid under Non-Aqueous Conditions
作者:Hussni A. Muathen
DOI:10.1007/s007060050309
日期:1999.12
The non-aqueous solution of chlorous acid is a versatile chlorinating agent for aromaticcompounds, e.g. alkylbenzenes, anisoles, and acetanililides. It is also an effective chlorine-substitute for the conversion of aryl bromides into aryl chlorides under mild conditions. The stoichiometry of the chlorination reaction is ArH+3HOClO→ArCl+2ClO2+2H2O, and the mode of dissociation of chlorous acid in
亚氯酸的非水溶液是用于芳族化合物( 例如 烷基苯,茴香醚和乙腈)的通用氯化剂 。它也是在温和条件下将芳基溴化物转化为芳基氯化物的有效氯代用品。氯化反应的化学计量是ARH + 3HOClO→ArCl等+ 2ClO 2 + 2H 2 O,和在二氯甲烷中的亚氯酸离解的模式被3HOClO→次氯酸+ 2ClO 2 + H 2 O.
Chlorination Reaction of Aromatic Compounds and Unsaturated Carbon–Carbon Bonds with Chlorine on Demand
作者:Feng Liu、Na Wu、Xu Cheng
DOI:10.1021/acs.orglett.1c00704
日期:2021.4.16
electrochemical transformation and the high reactivity of chlorine. By utilizing Cl3CCN as the chloride source, donating up to all three chloride atom, the reaction could generate and consume the chlorine in situ on demand to achieve the chlorination of aromaticcompounds and electrodeficient alkenes.
The reaction of arenes with a calculated amount of benzyltrimethylammonium tetrachloroiodate ir acetic acid at room temperature or at 70 °C gave nuclear chloro-substituted arenes in fairly good yields.
在室温或 70 °C 下,芳烃与计算量的四氯碘酸苄基铵和乙酸反应,以相当好的产率得到核氯取代的芳烃。
A Practical Lewis Base Catalyzed Electrophilic Chlorination of Arenes and Heterocycles
作者:Sean M. Maddox、Christopher J. Nalbandian、Davis E. Smith、Jeffrey L. Gustafson
DOI:10.1021/acs.orglett.5b00186
日期:2015.2.20
mild phosphine sulfide catalyzed electrophilic halogenation of arenes and heterocycles that utilizes inexpensive and readily available N-halosuccinimides is disclosed. This methodology is shown to efficiently chlorinate diverse aromatics, including simple arenes such as anthracene, and heterocycles such as indoles, pyrrolopyrimidines, and imidazoles. Arenes with Lewis acidic moieties also proved amenable