ChemInform Abstract The enolates, prepared in situ from the methyl ketones (I), are coupled with the azulenes (II) and subsequently oxidized with chloroanil to yield only the 6-substituted azulenes (III) and (IV). In contrast, the azulenes (V) give the 4-(VI) and the 6-substituted products (VII) by similar reaction with (Ib).
[reaction: see text] The Pt-catalyzed carboselenation of terminal alkynes with selenoesters provided vinylselenides regio- and stereoselectively in moderate yields.
Organo-selenium compoundsOrgano-selenium compounds S 0130The Pt-Catalyzed Carboselenation of Alkynes by Selenoesters. -A new entry for the facile preparation of functionalized vinylselenides in a stereo-and regioselective manner in moderate yields is described. The possibility of aroylselenation is also implicated. -(HIRAI, T.; KUNIYASU*, H.; KATO, T.; KURATA, Y.; KAMBE*, N.; Org. Lett. 5 (2003) 21, 3871-3873; Dep. Mol. Chem., Fac. Eng., Osaka Univ., Suita, Osaka 565, Japan; Eng.) -Steudel 08-177
Die Äldehyde (I) werden mit Bis‐(phenyIthio)‐methyllithium (II) umgesetzt und die erhaltenen Lithiumverbindungen (III) durch Behandlung mit Methyllithium bei 0°C in Phenylthiomethylketone (IV) umgewandelt.
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