Browsing by Author "Bar, N."
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Item Liquid and solid acids as catalysts for the Thiele–Winter reaction of menadione(2000) Villemin, D.; Bar, N.; Hammadi, M.; Hachemi, M.Liquid acid such as perchloric acid, chlorosulfonic or triflic acid can effectively replace sulfuric acid as a catalyst in Thiele–Winter reaction of menadione. Solid acids like zeolites and heteropolyacids are described for the first time as catalysts in Thiele–Winter reaction. The two step sequence (Thiele–Winter), saponification–oxidation) constitutes a new synthesis of the antibiotic phthiocol from menadioneItem Solvent-Free condensation of methyl pyridinium and quinolinium salts with aldehydes catalyzed by DBU(2012) Loucif Seiad, Linda; Villemin, D.; Bar, N.; Hachemi, M.Methylpyridinium and methylquinolinium salts were condensed under solvent-free conditions with aromatic aldehydes in the presence of 1,8-diazabicyclo[5.4.]undec-7-ene (DBU) as catalyst, by grinding at room temperature. The products are dyes or useful intermediates. The DBU can be easily recycled and reused