- Expeditious microwave-assisted thionation with the system PSCl 3/H2O/Et3N under solvent-free condition
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(Chemical Equation Presented) A novel thionation protocol for carbonyl compounds, with the system PSCl3/H2O/Et3N has been discovered. Clean, rapid, and efficient synthesis of a variety of thiocarbonyl compounds such as thioamides, thiolactams, thioketones, thioxanthones, and thioacridone can be achieved through this simple and convenient method under solventless condition with microwave irradiation.
- Pathak, Uma,Pandey, Lokesh Kumar,Tank, Rekha
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p. 2890 - 2893
(2008/09/19)
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- Synthetic Sulfur Carotenoids III: Carotenoid Thiones - First Preparation and Spectroscopic Properties
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The preparation of carotenoid thiones has been investigated, β,β-Caroten-4-thione, 4'-thioxo-β,β-caroten-4-one and 3'-thioxo-4',5'-didehydro-4',5'-retro-β,β-caroten-3-one were synthesized from echinenone, canthaxanthin and rhodoxanthin respectively.Charac
- Sliwka, Hans-Richard,Liaaen-Jensen, Synnoeve
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p. 679 - 683
(2007/10/02)
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- Bis(trimethylsilyl)sulfide based thionation of carbonyl compounds: Synthesis of thioketones
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A wide range of thioketones may be conveniently obtained by silyl triflate promoted bis(trimethylsilyl)sulfide thionation of ketones.
- Degl'Innocenti,Capperucci,Mordini,Reginato,Ricci,Cerreta
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p. 873 - 876
(2007/10/02)
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- MECHANISM OF OXIDATION OF α,β-UNSATURATED THIONES BY SINGLET OXYGEN
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Photo-oxidation of α,β-unsaturated thiones yields the corresponding ketones as the only product.Studies carried out three systems, namely thioketones, α,β-unsaturated thiones and thioketenes, have revealed that there exists a similarity in their mechanism of oxidation.It has been suggested that the thiocarbonyl chromophore is the site of attack by singlet oxygen in α,β-unsaturated thiones and that the adjacent C-C double bond is inert under these conditions.Absence of sulphine during the oxidation of α,β-unsaturated thiones is attributed to the electronic factors operating on the zwitterionic / diradical intermediate.While α,β-unsaturated ketones are poorly reactive, α,β-unsaturated thiones are highly reactive toward singlet oxygen.
- Rac, V. Pushkara,Ramamurthy, V.
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p. 2169 - 2176
(2007/10/02)
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