Aryl radicals from electrochemical reduction of aryl halides. Addition on olefins
摘要:
Aryl radicals generated by direct and indirect (by means of an aromatic anion radical mediator) electrochemistry are reacted with olefins in liquid ammonia and in organic solvents (Me2SO, MeCN, DMF). The arylated product is obtained in good yield in the latter case. In pure liquid NH3, the yields are extremely poor. They are improved upon addition of a proton donor such as urea or water; further increase of yields is obtained upon addition of 2-propanol. A reaction mechanism is proposed based on these observations and on the results of deuterium incorporation experiments. Cyclic voltammetry is used to determine the rate constant of the key step in the mechanism, viz, the addition of the aryl radical to the olefin, through its competition with its reaction with nucleophiles in the framework of an S(RN)1 substitution process.
Enforced Electronic‐Donor‐Acceptor Complex Formation in Water for Photochemical Cross‐Coupling
作者:Ya‐Ming Tian、Evamaria Hofmann、Wagner Silva、Xiang Pu、Didier Touraud、Ruth M. Gschwind、Werner Kunz、Burkhard König
DOI:10.1002/anie.202218775
日期:——
The sugar alcohol meglumine can solubilize organic compounds in water to synthetically useful levels, allowing the formation of enforced electron donor acceptor (EDA) complexes in water. These EDA complexes offer a new activation for light driven C−C and C−S cross-coupling chemistry without sensitizers.
Dimerization of aryl radicals as a termination step in SRN1 aromatic nucleophilic substitution
作者:Rofia Ettayeb、Jean Michel Saveant、Andre Thiebault
DOI:10.1021/ja00053a062
日期:1992.12
Ni-catalyzed C–S bond cleavage of aryl 2-pyridyl thioethers coupling with alkyl and aryl thiols
作者:Cheng-Yi Wang、Rui Tian、Yong-Ming Zhu
DOI:10.1016/j.tet.2021.132453
日期:2021.10
A nickel-catalyzed C–SPy bond activation reactions to produce a variety of thioethers has been developed. The reaction is promoted by a user-friendly, inexpensive, air and moisture-stable Ni precatalyst. Various aryl 2-pyridyl thioethers and a wide range of alkyl and aryl thiols substrates were tolerated in this process which afforded products in moderate to excellent yields.
Aryl radicals from electrochemical reduction of aryl halides. Addition on olefins
作者:Zoubida Chami、Monique Gareil、Jean Pinson、Jean Michel Saveant、Andre Thiebault
DOI:10.1021/jo00002a020
日期:1991.1
Aryl radicals generated by direct and indirect (by means of an aromatic anion radical mediator) electrochemistry are reacted with olefins in liquid ammonia and in organic solvents (Me2SO, MeCN, DMF). The arylated product is obtained in good yield in the latter case. In pure liquid NH3, the yields are extremely poor. They are improved upon addition of a proton donor such as urea or water; further increase of yields is obtained upon addition of 2-propanol. A reaction mechanism is proposed based on these observations and on the results of deuterium incorporation experiments. Cyclic voltammetry is used to determine the rate constant of the key step in the mechanism, viz, the addition of the aryl radical to the olefin, through its competition with its reaction with nucleophiles in the framework of an S(RN)1 substitution process.