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Citation: Davood Azarifar, Elahe Nadimi, Mohammd Mehdi Ghanbari. Silica-supported l,3-dichloro-5,5-dimethylhydantoin (DCH) as a useful reagent for microwave-assisted aromatization of 1,3,5-trisubstituted pyrazolines under solvent-free conditions[J]. Chinese Chemical Letters, ;2011, 22(4): 447-450. doi: 10.1016/j.cclet.2010.10.023 shu

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

a Department of Chemistry, School of Science, Bu Ali Sina University, 65174 Hamadan, Iran;
b Department of Chemistry, Kavar Branch, School of Applied Scientific and Technology, Kavar, Iran;
c Department of Chemistry, Sarvestan Branch, Islamic Azad University, Sarvestan, Iran

Received Date: 26 August 2010

1,3,5-Trisubstituted pyrazolines are rapidly and conveniently oxidized to their corresponding pyrazoles by l,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.
- Pyrazolines,
- 1,3-Dichloro-5,5-dimethylhydantoin(DCH),
- Aromatization,
- Solid-surface,
- Microwave irradiation
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