Metal-catalyzed Organic Photoreactions. The Photooxidation of Vinylsilanes and Vinyl Sulfides in the Presence of Iron(III) Chloride, and the Regioselective Synthesis of α-Chloro Ketones
The irradiation of a pyridine solution of vinylsilanes or vinyl sulfides in the presence of iron(III) chloride under oxygen produced α-chloro ketones, with a carbonyl group at the olefinic carbon originally bearing a silicon or sulfur atom.
Eine einfache Synthese 3,5- und 2,3,5-alkyl- und -arylsubstituierter Thiophene
作者:Karl Eichinger、Peter Mayr、Peter Nussbaumer
DOI:10.1055/s-1989-27202
日期:——
A Simple Synthesis of 3,5- and 2,3,5-Alkyl- or -Aryl-Substituted Thiophenes α-Bromo- and α-chloroalkanones react readily with tert-butylmercaptan according to Lissel1 to give 2-(tert-butylthio)ketones. Reaction of these ketones with the 1-alkynylmagnesium halides derived from phenylacetylene or 1-hexyne affords unstable mixtures of stereoisomeric 2-(tert-butylthio)-1-(1-alkynyl)alkanols which, upon treatment with hot aqueous acid, give 3,5-di- or 2,3,5-trisubstituted thiophenes in overall yields from 36 to 90%.
α-Chlorination of Ketones with Sodium Chlorite, Mn(acac)<sub>3</sub>, and Alumina in Dichloromethane
作者:Shigetaka Yakabe、Masao Hirano、Takashi Morimoto
DOI:10.1080/00397919808005082
日期:1998.1
Chlorination of a variety of aliphatic, alicyclic, and aromatic ketones with a reagent combination of NaClO2 and Mn(acac)(3) catalyst can be readily performed in dichloromethane to afford alpha-chloroketones in good yield under mild and neutral conditions with the aid of chromatographic neutral alumina.
Tiffeneau; Tchoubar; Le Tellier, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1943, vol. 216, p. 856