Merging shuttle reactions and paired electrolysis for reversible vicinal dihalogenations
作者:Xichang Dong、Johannes L. Roeckl、Siegfried R. Waldvogel、Bill Morandi
DOI:10.1126/science.abf2974
日期:2021.1.29
shuttle (e-shuttle) paradigm for the facile and scalable interconversion of alkenes and vicinal dihalides, a class of reactions that can be used both to synthesize useful dihalogenated molecules from simple alkenes and to recycle waste material through retro-dihalogenation. The reaction is demonstrated using 1,2-dibromoethane, as well as 1,1,1,2-tetrachloroethane or 1,2-dichloroethane, to dibrominate or
The Electrochemical
<i>cis</i>
‐Chlorination of Alkenes
作者:Julia Strehl、Cornelius Fastie、Gerhard Hilt
DOI:10.1002/chem.202103316
日期:2021.12.9
Double role: The cis-chlorination of alkenes is realised in an electrochemical setup with PhSeCl as catalyst. The supporting electrolyte (TBACl) acts as nucleophilic reagent for the SN2-type replacement of selenium versus chloride in the key step of the process while the PhSeCl-alkene adduct is activated by electrochemically generated PhSeCl3.
双重作用:烯烃的顺式氯化是在以 PhSeCl 作为催化剂的电化学装置中实现的。在该过程的关键步骤中,支持电解质(TBACl)充当硒与氯的S N 2 型取代的亲核试剂,同时PhSeCl-烯烃加合物被电化学产生的PhSeCl 3活化。
Visible‐Light‐Induced Vicinal Dichlorination of Alkenes through LMCT Excitation of CuCl
<sub>2</sub>
作者:Pengcheng Lian、Wenhao Long、Jingjing Li、Yonggao Zheng、Xiaobing Wan
DOI:10.1002/ange.202010801
日期:2020.12.21
AbstractThis work demonstrates photoredox vicinal dichlorination of alkenes, based on the homolysis of CuCl2 in response to irradiation with visible light. This catalysis proceeds via a ligand to metal charge transfer process and provides an exciting opportunity for the synthesis of 1,2‐dichloride compounds using an inexpensive, low‐molecular‐weight chlorine source. This new process exhibits a wide
2-dichloroalkane derivatives from olefins using NH4Cl and Oxone® at room temperature is described. A variety of terminal, internal, and cyclic alkenes reacted smoothly to give the corresponding dichlorinated products in good to excellent yields. Moreover, 1,2-disubstituted symmetrical and unsymmetrical olefins dichlorinated with moderate to excellent diastereoselectivity. This method precludes the use of