- SULFUR EXTRUSION FROM DISULFIDES BY CARBENES
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The present invention relates to a method for preparing a compound T having a thioether group from a compound D having a disulfide group in the presence of a carbene.
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Page/Page column 30-31; 36-37
(2021/10/30)
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- Oxo-rhenium(V) complexes containing heterocyclic ligands as catalysts for the reduction of sulfoxides
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This work reports the catalytic activity of a large variety of oxo-rhenium(V) complexes (1 mol-%) containing the ligands 2-(2-hydroxy-5- methylphenyl)benzotriazole (Hhmpbta), 2-(2-hydroxyphenyl)benzothiazole (Hhpbt), 2-(2-hydroxyphenyl)benzoxazole (Hhpbo), and 2-(2-hydroxyphenyl)-1H-benzimidazole (Hhpbi) in the deoxygenation of sulfoxides with silanes or boranes as the reducing agents. In general, all of the complexes are excellent catalysts, although the PhSiH3/[ReOBr2(hmpbta)(PPh3)] and pinacolborane/[ReOBr2(hmpbta)(PPh3)] systems are the most efficient for the reduction of aromatic and aliphatic sulfoxides and tolerate different functional groups. Copyright
- Sousa, Sara C. A.,Bernardo, Joana R.,Wolff, Mariusz,Machura, Barbara,Fernandes, Ana C.
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p. 1855 - 1859
(2014/04/03)
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- Oxo-Rhenium(V) Complexes Containing Heterocyclic Ligands as Catalysts for the Reduction of Sulfoxides
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This work reports the catalytic activity of a large variety of oxo-rhenium(V) complexes (1 mol-%) containing the ligands 2-(2-hydroxy-5-methylphenyl)benzotriazole (Hhmpbta), 2-(2-hydroxyphenyl)benzothiazole (Hhpbt), 2-(2-hydroxyphenyl)benzoxazole (Hhpbo), and 2-(2-hydroxyphenyl)-1H-benzimidazole (Hhpbi) in the deoxygenation of sulfoxides with silanes or boranes as the reducing agents. In general, all of the complexes are excellent catalysts, although the PhSiH3/[ReOBr2(hmpbta)(PPh3)] and pinacolborane/[ReOBr2(hmpbta)(PPh3)] systems are the most efficient for the reduction of aromatic and aliphatic sulfoxides and tolerate different functional groups.
- Sousa, Sara C. A.,Bernardo, Joana R.,Wolff, Mariusz,Machura, Barbara,Fernandes, Ana C.
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supporting information
p. 1855 - 1859
(2015/10/05)
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- Highly efficient rhenium-catalyzed deoxygenation of sulfoxides without adding any reducing agent
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This work reports a novel method for the deoxygenation of aromatic and aliphatic sulfoxides catalyzed by oxo-rhenium complexes without adding any reducing agent. The oxo-rhenium complex ReOCl3(PPh3) 2 proved to be very efficient for the deoxygenation of several sulfoxides with tolerance of different functional groups.
- Sousa, Sara C.A.,Bernardo, Joana R.,Rom?o, Carlos C.,Fernandes, Ana C.
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experimental part
p. 8194 - 8197
(2012/09/22)
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- Some Novel Meatlike Aroma Compounds from the Reactions of Alkanediones with Hydrogen Sulfide and Furanthiols
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The products of reactions of hydrogen sulfide with 2,3-butanedione and with 2,3-pentanedione in dilute ethanolic solution were analyzed by GC-MS and GC-odor port analysis.Components were also collected from the GC column and analyzed by 1H NMR.Mercaptoketones were formed which readily oxidized to the corresponding disulfides with traces of mono- and trisulfides.When 2-methyl-3-furanthiol or 2-furylmethanethiol was added to the reaction mixtures, a series of disulfides containing alkanone, 2-methyl-3-furyl and 2-furanmethyl moieties were formed.Some of these compounds have been found recently in the volatiles of cooked meat and in meatlike model systems.GC-odor port evaluation of the components of the reaction systems showed that disulfides containing the 2-methyl-3-furyl group had meaty aromas, whereas those without this group were sulfurous or onion-like in character.Keywords: Aroma; meat; mercaptoketones; disulfides
- Mottram, Donald S.,Madruga, Marta S.,Whitfield, Frank B.
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p. 189 - 193
(2007/10/02)
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