Silica-supported 1,3-dichloro-5,5-dimethylhydantoin(DCH) as a useful reagent for microwave-assisted aromatization of 1,3,5-trisubstituted pyrazolines under solvent-free conditions  

作　　者：Davood Azarifar Elahe Nadimi Mohammd Mehdi Ghanbari 

机构地区：[1]Department of Chemistry,School of Science,Bu Ali Sina University,65174 Hamadan,Iran [2]Department of Chemistry,Kavar Branch,School of Applied Scientific and Technology,Kavar,Iran [3]Department of Chemistry,Sarvestan Branch,Islamic Azad University,Sarvestan,Iran

出　　处：《Chinese Chemical Letters》2011年第4期447-450,共4页中国化学快报（英文版）

摘　　要：1,3,5-Trisubstituted pyrazolines are rapidly and conveniently oxidized to their corresponding pyrazoles by 1,3-dichloro-5,5- dimethylhydantoin（DCH） in solution and solvent-free conditions under microwave irradiation.The presence of silica gel as a supporting agent is shown to be effective in reducing the reaction times and increasing the yields.1,3,5-Trisubstituted pyrazolines are rapidly and conveniently oxidized to their corresponding pyrazoles by 1,3-dichloro-5,5- dimethylhydantoin（DCH） in solution and solvent-free conditions under microwave irradiation.The presence of silica gel as a supporting agent is shown to be effective in reducing the reaction times and increasing the yields.

关 键 词：PYRAZOLINES 1 3-Dichloro-5 5-dimethylhydantoin（DCH） AROMATIZATION SOLID-SURFACE Microwave irradiation 

分 类 号：O621.25[理学—有机化学]