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- W2297200909 abstract "The synthesis of xanthenes is important in organic synthesis because of their wide range of biological and pharmaceutical properties, such as agricultural bactericide activity, antiinflammatory [1]. They have also been used for photodynamic therapy, used as dyes [2]. Fortunately, there have been extensive praiseworthy achievements in this field, especially those successful reactions achieved under solvent free conditions, which demonstrate various obvious and significant advantages [3]. For this purpose, react two molecules of dimedone with various aromatic aldehydes, by using of different Lewis acid catalysts such as Fe3O4NPS [4], PFPAT [5], Dowex-50W ion exchange resin under solvent-free conditions [6], phosphomolybdic acid supported on silica gel DABCO [7], HClO4–SiO2 [8], P2O5/SiO2 or Silphos [9], , ZnO and ZnO acety l chloride [10]. We wish to report a novel and efficient method for the Knoevenagel condensation of dimedone and various aromatic aldehydes on Phosphorus pentoxide used on alumina in the absence of organic solvents in good yield (Scheme 1)." @default.
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- W2297200909 date "2012-05-01" @default.
- W2297200909 modified "2023-09-26" @default.
- W2297200909 title "SYNTHESIS OF 1,8-DIOXO-OCTAHYDROXANTHENES UNDER SOLVENT-FREE CONDITIONS VIA PHOSPHORUS PENTOXIDE SUPPORTED ON ALUMINA (P2O5/AL2O3) CATALYZED TANDEM REACTION OF ALDEHYDE WITH DIMEDONE" @default.
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