- Synthesis of pentafluorobenzene-based NHC adducts and their catalytic activity in the microwave-assisted reactions of aldehydes
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N-Heterocyclic carbenes (NHCs) have been widely used in organometallic chemistry as ligands, as well as standalone organocatalysts in various reactions, mostly using aromatic aldehydes as substrates. We have previously demonstrated the efficiency of azolium-2-carboxylate zwitterions in the hydroxymethylation of aldehydes, especially aliphatic aldehydes, under microwave irradiation. In the present work, we report a series of pentafluorobenzene-based NHC adducts and their efficiency in the hydroxymethylation and self-condensation of aliphatic and aromatic aldehydes using microwave irradiation. The free carbenes are released under the reaction conditions and 1,3-dimesityl-2-(perfluorophenyl)imidazolidine and 1,3-bis(2,6-dimethylphenyl)-2-(perfluorophenyl)imidazolidine proved to be the most potent precatalysts.
- Papadaki, Evanthia,Magrioti, Victoria
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supporting information
(2019/12/24)
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- BIS-IMINE TITANIUM COMPLEX, CATALYTIC SYSTEM COMPRISING SAID BIS-IMINE TITANIUM COMPLEX AND PROCESS FOR THE (CO)POLYMERIZATION OF CONJUGATED DIENES
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Bis-imine titanium complex having general formula (I): wherein: R1 and R2, mutually identical or different, represent a hydrogen atom; or are selected from linear or branched, optionally halogenated, C1-C20 alky
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Page/Page column 28; 29
(2019/04/26)
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- Synthesis of 1,4-diazabutadienes (=N,N′-ethane-1,2- diylidenebis[amines]) by grinding
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A simple and convenient method for the synthesis of 1,4-diazabutadienes (=N,N′-ethane-1,2-diylidenebis[amines]) by grinding glyoxal (=ethanedial) or an α-diketone and anilines (=benzenamines) in the presence of TsOH in a mortar with a pestle is described.
- He, Jingyu,Xin, Hongxing,Yan, Hong,Song, Xiuqing,Zhong, Rugang
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experimental part
p. 159 - 162
(2011/03/16)
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- Flash Vacuum Thermolysis of Four Membered Rings Containing Nitrogen Atom. Part V. Synthesis of Glyoxal Monoimines by Thermal Decomposition of 4-Formylazetidin-2-ones
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The thermal cleavage of some 4-formylazetidin-2-ones has been studied. 4-Aryl-1,4-oxazabuta-1,3-dienes (glyoxal monoimines) were obtained as the main products with small additions of aryl isocyanates.Some mechanistic aspects of these reactions have been discussed. - Keywords: β-lactams, 4-aryl-1,4-oxazabuta-1,3-dienes, glyoxal monoimines, flash vacuum thermolysis
- Lesniak, S.
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p. 1490 - 1496
(2007/10/03)
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