- Double Michael addition of dithiols to acetylenic carbonyl compounds under the influence of molecular sieve and dimethyl sulfoxide
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Double Michael addition of dithiols such as 1,3-propanedithiol and 1,2-ethanedithiol to α,β-acetylenic carbonyl compounds in the presence of molecular sieve and dimethyl sulfoxide proceeds very smoothly to afford the corresponding β-keto 1,3-dithianes and
- Kakinuma, Tomoko,Oriyama, Takeshi
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experimental part
p. 290 - 292
(2010/03/26)
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- On the synthesis of β-keto-1,3-dithianes from conjugated ynones catalyzed by magnesium oxide
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MgO was used for the first time as a heterogeneous basic catalyst to synthesize β-keto-1,3-dithianes, potentially useful synthetic intermediates, from conjugated ynones and ynoates.
- Xu, Chunli,Bartley, Jonathan K.,Enache, Dan I.,Knight, David W.,Lunn, Matthew,Lok, Martin,Hutchings, Graham J.
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p. 2454 - 2456
(2008/09/20)
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- Oxidative Generation of Thioalkyl Cations from 2-Tributylstannyl-1,3-dithianes and 1-(Tributylstannyl)alkyl Sulfides and Their Reactions with Olefinic Nucleophiles
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2-Tributylstannyl-1,3-dithianes and 1-(tributylstannyl)alkyl sulfides are oxidized with ammonium hexanitratocerate(IV) or ferrocenium hexafluorophosphate to generate their cation radicals, which dissociate into the carbocations and tributylstannyl radical
- Narasaka, Koichi,Arai, Noriyoshi,Okauchi, Tatsuo
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p. 2995 - 3003
(2007/10/02)
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- Generation of Cation Radicals from 2-Tributylstannyl-1,3-dithianes and their Reaction with Olefins
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Oxidation of 2-tributylstannyl-1,3-dithianes with metallic oxidants generates reactive species such as 1,3-dithian-2-yl radical and/or cation by eliminating the stannyl group.Those intermediates react with olefins to give the intermolecular addition produ
- Narasaka, Koichi,Okauchi, Tatsuo,Arai, Noriyoshi
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p. 1229 - 1232
(2007/10/02)
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- 1,3-Dithienium- and 1,3-Dithiolenium Salts, II. Synthesis of Monocyclothioacetalized 1,3-Diketones from Silyl Enol Ethers
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The 1,3-dithienium and 1,3-dithiolenium salts 3, available from the dithiols 1 or the cyclic thioacetals 4 (n=2, 3) by reaction with the acyl chlorides 2, trityl tetrafluoroborate (5), and sulfuryl chloride (7), react in good yields with the silyl enol ethers 10 to give the new monocyclothioacetalized 1,3-diketones 11.The synthetic potential of 11 as partially protected 1,3-diketones is demonstrated exemplarily by dethioacetalization to the 1,3-dicarbonyl compounds 13.
- Stahl, Ingfried
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p. 1798 - 1808
(2007/10/02)
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