- Visible-Light-Driven Reductive (Cyclo)Dimerization of Chalcones over Heterogeneous Carbon Nitride Photocatalyst
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Single-electron reduction of chalcones to the respective radical anions is a useful technique to activate these molecules toward subsequent transformations. Herein, a metal-free photocatalytic version of chalcones reduction in the presence of triethanolam
- Kurpil, Bogdan,Markushyna, Yevheniia,Savateev, Aleksandr
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p. 1531 - 1538
(2019/02/10)
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- Reactivity insight into reductive coupling and aldol cyclization of chalcones by visible light photocatalysis
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The reductive coupling and cyclization of chalcones to generate cyclopentanol derivatives in up to 84% yield by visible light photoredox catalysis is described. This reaction involves radical anion homocoupling, monoprotonation, and intramolecular cycliza
- Zhao, Guolei,Yang, Chao,Guo, Lin,Sun, Hongnan,Lin, Run,Xia, Wujiong
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experimental part
p. 6302 - 6306
(2012/09/25)
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- Aluminium chloride assisted zinc-induced reduction of some α,β-unsaturated ketones
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Some α,β-unsaturated ketones are reduced to give cyclodimerization products and/or β,β-coupling products in presence of Zn-AlCl3.6H2O-moist THF and aluminium chloride acts as Lewis acid to increase the yield of the products.
- Dey, Sankar P.
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scheme or table
p. 761 - 763
(2010/08/19)
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- Zinc-mediated reductive cyclodimerization of α,β-unsaturated aryl ketones under aqueous conditions
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Zinc-mediated reductive cyclodimerization of ?,?-unsaturated aryl ketones produces 3,4-trans-diarylcyclopentanols 2 regio- and stereoselectively in good yields in a 1:4 (v/v) mixture of saturated aqueous NH4Cl and tetrahydrofuran at room temper
- Kumar, Anil,Kumar, Satish,Kapoor, Kamal K.
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p. 621 - 623
(2008/03/12)
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- Cyclodimerisation of α,β-unsaturated ketones promoted by the TiCl4/Sm system
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The cyclodimerisation of α,β-unsaturated ketones induced by the TiCl4/Sm system was studied, cyclopentanol derivatives are prepared in good yields under neutral and mild conditions.
- Shi, Daqing,Rong, Liangce,Wang, Juxian,Zhuang, Qiya,Wang, Xiangshan,Tu, Shujiang,Hu, Hongwen
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p. 268 - 269
(2007/10/03)
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- Electro-organic reactions. Part 51. Reactivity and stereochemical pathways for cathodically generated radical-anions of α,β-unsaturated ketones in aqueous media
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The cathodic reduction of α,β-unsaturated ketones in aqueous electrolyte gives efficient C-C coupling with the high stereoselectivity associated with similar reactions in aprotic media. The key features of these reactions are consistent with those expected from the likely mechanism involving water-templated coupling of radical-anions. As a further consequence the stereochemistry of the major products (cyclopentanols and linear hydrodimers) has been unambiguously assigned using X-ray crystallography and 2D NOESY 1H NMR experiments.
- Utley, James H.P.,Smith, Carmen Z.,Motevalli, Majid
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p. 1053 - 1057
(2007/10/03)
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- Cyclo- and hydrodimerization of α,β-unsaturated ketones promoted by samarium diiodode
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Samarium(II) iodide is a strong one-electron transfer reducing agent, and is effective for the cyclo- and hydrodimerization of cyclic and non-cyclic α,β-unsaturated ketones.The title dimers can easily be prepared in good yields at room temperature under n
- Cabrera, Armando,Lagadec, Ronan Le,Sharma, Pankaj,Arias, Jose Luis,Toscano, Ruben Alfredo,et al.
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p. 3609 - 3618
(2007/10/03)
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- Reaction of Chalcone Derivatives with Aromatic Aldehydes Promoted by Ytterbium Metal
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Ytterbium metal promoted reaction of chalcone with equimolar amount of benzaldehyde gave 2-benzoyl-5-phenylhydroxymethyl-1,3,4-triphenylcyclopentanol, whereas 2,5-bis(benzoyl)cyclopentanol was obtained by the reaction with excess amount of the aldehyde.In
- Takaki, Ken,Beppu, Fumikazu,Nakagawa, Ikuko,Fujiwara, Yuzo
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p. 535 - 538
(2007/10/02)
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- ELECTRO-HYDRODIMERISATION D'ENONES EN PRESENCE DE SELS METALLIQUES
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The electrochemical reduction of para substituted 1,3 phenylpropenone in DMF-TBABr in the presence of Li(1+), Cr(2+), Mn(2+), Fe(2+), Co(2+), Ni(2+), Zn(2+) leads to two hydrodimers in high yields with total lack of polymerisation.
- Berthelot, Jacques,Guette, Catherine,Fournier, Francoise,Davoust, Daniel
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p. 1881 - 1884
(2007/10/02)
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- THE CHEMISTRY OF CHALKONES. PART III. DEHYDRATION OF HYDROXYKETONES OBTAINED BY CLEMMENSEN REDUCTION OF CHALKONES
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Reduction of 1,3-diphenyl-2-propene-1-ones with zinc dust in acetic acid yields a mixture of dimeric products: diketones and cyclic ketols.These ketols undergo dehydration under acidic and basic conditions.The structure of the products obtained is establi
- Mirek, Julian,Gaweda, Maria,Kawalek, Bozena
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p. 987 - 993
(2007/10/02)
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