Samarium diiodide / hexamethylphosphoramide promoted dimerization of benzaldehydes
作者:Jiann-Shyng Shiue、Chun-Cheng Lin、Jim-Min Fang
DOI:10.1016/s0040-4039(00)60581-6
日期:1993.1
Benzaldehyde, its ortho- and meta-substituted derivatives and acetophenone underwent dimerization reactions on treatment with samarium(II) iodide in the presence of HMPA. Intramolecular phenyl-carbonyl coupling reactions were similarly carried out.
para-Selective, Direct C(sp<sup>2</sup>)–H Alkylation of Electron-Deficient Arenes by the Electroreduction Process
作者:Pufan Ni、Lei Yang、Jiasheng Yang、Ruihua Cheng、Weiping Zhu、Yueyue Ma、Jinxing Ye
DOI:10.1021/acs.joc.2c02412
日期:2023.5.5
para-selective C(sp2)–H alkylation of electron-deficient arenes based on the electroreduction-enabled radical addition of alkyl bromides has been developed under mild conditions. In the absence of any metals and redox agents, the simple electrolysis system tolerates a variety of primary, secondary, and tertiary alkyl bromides and behaves as an important complement to the directed alkylation of the C(sp2)–H bond
Samarium(II) Iodide Promoted Fragmentation and Sequential Reactions of Aromatic 1,4-Diketones
作者:D. Bradley G. Williams、Kevin Blann、Cedric W. Holzapfel
DOI:10.1021/jo9919005
日期:2000.5.1
Reductive Coupling of Aromatic Aldehydes and Ketones Under Electrochemical Conditions
作者:Toreshettahally R Swaroop、Zi-Qiang Wang、Qian-Yu Li、Heng Shan Wang
DOI:10.1149/1945-7111/ab72ed
日期:——
Reductive coupling of o-substituted carbonyl compounds and m-substituted carbonyl compounds by the direct transfer of electron to carbonyl group respectively gave 1-(4-(1-hydroxy-1-phenylethyl/methyl)phenyl)ethanones/methanones and 2,3-bis(3-substitutedphenyl)butane/ethane-2,3-diols. 4-Methoxyacetophenone surprisingly gave 4-methoxybenzoic acid as oxidation product. Even acetophenone conjugated with alkyne group afforded interesting reductive addition product. Finally, imine also furnished reductively coupled diamino compound. Probable mechanisms for the formation of products is proposed. (c) 2020 The Electrochemical Society ("ECS"). Published on behalf of ECS by IOP Publishing Limited.
Phenyl−Carbonyl Coupling Reactions Promoted by Samarium Diiodide and Hexamethylphosphoramide
作者:Jiann-Shyng Shiue、Mei-Huey Lin、Jim-Min Fang
DOI:10.1021/jo9702498
日期:1997.7.1
By mediation of samarium diiodide and hexamethylphosphoramide, benzaldehydes and acetophenones underwent self- and cross-couplings to give the products having linkages at the para-carbons of phenyl rings and the carbonyl groups. The phenyl- carbonyl coupling of 2,5-dimethoxybenzaldehyde generated a Sm(III)-enolate intermediate, which was trapped by alkyl halides in a stereospecific manner to give uncommon 1,4-dialkyl-2,5-cyclohexadiene-1-carboxaldehydes. The benzaldehydes bearing tethered carbonyl chains proceeded with intramolecular phenyl-carbonyl couplings to afford fused benzocycles.