Copper-catalyzed aromatic C–H bond halogenation with lithium halides under aerobic conditions
作者:Song Mo、Yamin Zhu、Zengming Shen
DOI:10.1039/c3ob40185e
日期:——
A concise and practical Cu-catalyzed protocol for the preparation of chloro- and bromoarenes via C–H bond activation has been developed. The advantages of this strategy are the employment of cheap Cu(NO3)2·3H2O, LiX and O2, and its compatibility with both electron-donating and electron-withdrawing substituents on aryl rings.
[EN] COMPLEXES AND CATALYTIC PROCESSES<br/>[FR] COMPLEXES ET PROCÉDÉS CATALYTIQUES
申请人:UNIV SUSSEX
公开号:WO2015087062A1
公开(公告)日:2015-06-18
The present application is directed towards complexes of formula (I), to methods for preparing such complexes, and to use of such complexes in catalysis. The complexes show utility in a range of catalytic cycles, including Pd(ll)/Pd(IV) cycles. (Formula (I))
A new strategy for catalytic functionalization of C-H bonds by means of electrochemical oxidation is described. Combination of palladium-catalyzed aromatic C-H bond cleavage and halogenation with electrochemically generated halonium ions enables highly efficient, selective halogenations of aromatic compounds in a green-sustainable manner. The required reagents for this reaction are an arene and an
Copper(ii)-catalyzed ortho-functionalization of 2-arylpyridines with acyl chlorides
作者:Wenhui Wang、Changduo Pan、Fan Chen、Jiang Cheng
DOI:10.1039/c0cc05557c
日期:——
Copper-catalyzed ortho-benzoxylation of 2-arylpyridine sp2 C–H bonds with acyl chloride is described. Notably, switching the base from t-BuOK to Li2CO3 causes chlorination of the C–H bond to take place.
In this work, we report the first use of a salen-based hypercrosslinked polymer-supportedPdcatalyst to carry out C-H halogenation. This catalyst can effectively catalyze C-H bromination and chlorination even better than its homogeneous counterpart Pd(OAc)2. It also showed excellent reusability without loss of catalytic activity for ten cycles. A broad substrate scope was explored and moderate to