- SYNTHESES WITH DIKETO SELENIDES
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We report a) a modified synthesis of diketo selenides, b) preparation of 2,5-diacylselenophenes by condensation of diketoselenides with glyoxal, c) preparation of poly-substituted selenophenes by intramolecular reductive coupling reaction of diketo selenides with low-valent titanium reagent under controlled conditions (0 degC) followed by dehydratation of the resulting 3,4-dihydroxyselenolanes, and d) formation of 2,5-dihydroselenophenes and 1,3-dienes by treatment of diketo selenides with the low-valent titanium reagent in refluxing tetrahydrofuran.
- Nakayama, Juzo,Shibuya, Masahiro,Ikuina, Yoji,Murai, Fumito,Hoshino, Masamatsu
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p. 149 - 156
(2007/10/02)
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- A NOVEL SYNTHESIS OF SELENOPHENES
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Reduction of α,α'-diketo selenides with a low-valent titanium reagent usually affords 3,4-dihydroxyselenolanes, from wich the corresponding selenophenes are obtained by acid-catalyzed dehydration.A surprising exception is the formation of 2,4-dihydroy-2,4-di-t-butylselenolane from bis(2-t-butyl-2-oxoethyl) selenide, the former being converted to 2,4-di-t-butylselenophene by acid treatment.
- Nakayama, Juzo,Murai, Fumito,Hoshino, Masamatsu,Ishii, Akihiko
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p. 1399 - 1400
(2007/10/02)
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- Formation of 2,5-Dihydroselenophenes and 1,3-Dienes from Diketo Selenides by Reduction with Low-valent Titanium Reagents
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Reduction of a series of diketo selenides with a low-valent titanium reagent affords 2,5-dihydroselenophenes and 1,3-dienes in comparable yields.
- Nakayama, Juzo,Ikuina, Yoji,Murai, Fumito,Hoshino, Masamatsu
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p. 1072 - 1073
(2007/10/02)
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