Browsing by Author "Villemin, D."
Now showing 1 - 4 of 4
- Results Per Page
- Sort Options
Item Cesium fluoride on calcium oxide as a strongly basic catalyst. synthesis of flavones and tobacco alkaloids(2003) Villemin, D.; Hachemi, M.CsF on CaO was used as a catalyst in the synthesis of flavones and their derivatives from esters of 2-hydroxyacetophenones and in the synthesis of tobacco alkaloids from aromatic amidesItem 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 reusedItem Synthesis of 1, 3-oxathiolanes without use of organic solvent at room temperature. Remarkable functional selectivity(2016) Dokari, H.; Hammadi, M.; Benferrah, N.; Villemin, D.The aluminosilicates acids are efficient catalysts for the synthesis of oxathiolanes without solvent at room temperature. A functional selectivity was observed between aldehydes and ketones, aldehydes were transformed quantitatively. A functional selectivity has not been described before, it was observed within differents aldehydes or within differents ketones. This selectivity is important for the control of the reactions (activation or protection) of carbonyl compounds in organic synthesis