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。
Catalytic, stereospecific syn-dichlorination of alkenes
作者:Alexander J. Cresswell、Stanley T.-C. Eey、Scott E. Denmark
DOI:10.1038/nchem.2141
日期:2015.2
As some of the oldest organic chemical reactions known, the ionic additions of elemental halogens such as bromine and chlorine to alkenes are prototypical examples of stereospecific reactions, typically delivering vicinal dihalides resulting from anti-addition. Although the invention of enantioselective variants is an ongoing challenge, the ability to overturn the intrinsic anti-diastereospecificity
Peroxide-induced α-elimination of organic halides from organotellurium(<scp>IV</scp>) halides
作者:Sakae Uemura、Shin-Ichi Fukuzawa
DOI:10.1039/c39800001033
日期:——
Treatment of organotellurium(IV) halides with t-butyl hydroperoxide in 1,4-dioxan, acetic acid, or acetonitrile affords the corresponding organichalides in good to moderate yields presumably as the result of a 1,2-halogen shift.
Chlorination of cyclohexene by copper(II) chloride
作者:Philip H. Gamlen、Michael S. Henty、Hugh L. Roberts
DOI:10.1039/dt9830001373
日期:——
Evidence is presented which indicates that CuCl+ is the reactive species in the chlorination of cyclohexene by copper(II) chloride in acetonitrile. The reaction is retarded by an excess of chloride ion and by copper(I) salts, and accelerated by aluminium trichloride. A kinetic scheme which accounts for these observations is suggested.
Diphenyl diselenide (PhSeSePh) was effective as a pre-catalyst for the vicinal dichlorination of α,β-unsaturated phosphonates with sulfuryl chloride. The reaction conditions were mild and the desired products were formed in up to 93% yield and moderate diastereoselectivity (10 : 1). The important diphenylselenium dichloride intermediate was obtained and characterized by X-ray crystallography.