Radical ions in photochemistry. Part 24. Carbon-carbon bond cleavage of radical cations in solution: theory and application
作者:Roman Popielarz、Donald R. Arnold
DOI:10.1021/ja00164a030
日期:1990.4
The cleavage of radicalcations of two series of alkanes, 1,1,2-triaryl- and 1,1,2,2-tetraarylalkanes, generated by photoinduced single electron transfer in acetonitrile-methanol, occurs with formation of radical and carbocation fragments. The radicalcations of some unsymmetrically substituted alkanes cleave to give all four of the possible products, two hydrocarbons emanating from the radicals and
Dialkyl Ether Formation by Nickel‐Catalyzed Cross‐Coupling of Acetals and Aryl Iodides
作者:Kevin M. Arendt、Abigail G. Doyle
DOI:10.1002/anie.201503936
日期:2015.8.17
A new substrate class for nickel‐catalyzed C(sp3) cross‐coupling reactions is reported. α‐Oxy radicals generated from benzylic acetals, TMSCl, and a mild reductant can participate in chemoselective cross‐coupling with aryliodides using a 2,6‐bis(N‐pyrazolyl)pyridine (bpp)/Ni catalyst. The mild, base‐free conditions are tolerant of a variety of functional groups on both partners, thus representing
Photolysis of Tetraarylmethanes and 3-(Triarylmethyl)pyridines
作者:Min Shi、Yoshiki Okamoto、Setsuo Takamuku
DOI:10.1246/bcsj.63.2731
日期:1990.9
Upon UV irradiation in benzene–methanol (1:2) tetraarylmethanes or 3-(triarylmethyl)pyridines underwent an α,α-elimination of two aryl groups to give biaryls or 3-arylpyridine, and two corresponding carbene intermediates. The latters afforded methyl ethers by the O–H insertion to methanol.
Simple and Direct sp<sup>3</sup> C–H Bond Arylation of Tetrahydroisoquinolines and Isochromans via 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone Oxidation under Mild Conditions
作者:Wataru Muramatsu、Kimihiro Nakano、Chao-Jun Li
DOI:10.1021/ol401534g
日期:2013.7.19
The 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-mediated sp3C–Hbondarylation of tetrahydroisoquinolines and isochromans is described. The corresponding products were facilely synthesized via a simple nucleophilic addition reaction between readily available aryl Grignard reagents and iminium (or oxonium) cations generated in situ by DDQ oxidation of tetrahydroisoquinolines (or isochromans) under
METHOD FOR THE PREPARATION OF alpha-SUBSTITUTED ACRYL ALDEHYDES
申请人:Council of Scientific and Industrial Research
公开号:US20160083409A1
公开(公告)日:2016-03-24
The invention discloses simple and rapid method for the preparation of α-substituted acryl aldehydes. More particularly, the invention discloses a method for the preparation of α-substituted acryl aldehydes via a gold-catalysed [1,3] rearrangement of the allenyl ethers with a record turnover frequency of 4600 h
−1
at 0.05 mol % of the catalyst concentration in homogeneous gold(I) catalysis. The α-substituted acryl aldehydes synthesized by the instant process are used as building blocks in organic synthesis.