Silica chloride/NaNO2 as a novel heterogeneous system for the oxidation of urazoles under mild conditions
作者:Mohammad Ali Zolfigol、Mehdi Torabi、Shadpour E Mallakpour
DOI:10.1016/s0040-4020(01)00832-8
日期:2001.9
Urazoles and bis-urazoles can be converted in excellent yields to their corresponding triazolinediones, with a combination of silica chloride (I), wet SiO2 and sodium nitrite in dichloromethane at room temperature.
An efficient method for the oxidation of urazoles with [NO+·crown·H(NO3)2−]
作者:Mohammad Ali Zolfigol、Mohammad Hassan Zebarjadian、Gholamabbas Chehardoli、Shadpour E Mallakpour、Mojtaba Shamsipur
DOI:10.1016/s0040-4020(00)01150-9
日期:2001.2
An ionic complex has been obtained from N2O4 in the presence of the macrocyclicpolyether 18-crown-6. This crystallinecompound was used as an effective oxidizing agent for the oxidation of urazoles to their corresponding triazolinediones at room temperature with excellent yields.
在大环聚醚18-冠-6的存在下,已从N 2 O 4获得了离子络合物。该结晶化合物被用作有效的氧化剂,用于在室温下以优异的产率将脲唑氧化为它们相应的三唑啉二酮。
Supported Nitric Acid on Silica Gel and Polyvinyl Pyrrolidone (PVP) as an Efficient Oxidizing Agent for the Oxidation of Urazoles and Bis-urazoles
Abstract A method for the oxidation of a good range of urazoles and bis-urazoles to the corresponding triazolinediones by supported nitricacid on silica gel (SiO2-HNO3) and/or polyvinyl pyrrolidone (PVP-HNO3) is described. Reactions have been carried out heterogeneously at room temperature in dichloromethane with good to excellent yields.
Oxidation of Urazoles with 1,3-Dihalo-5,5-dimethylhydantoin, both in Solution and under Solvent-Free Conditions
作者:Mohammad Ali Zolfigol、Hossein Nasr-Isfahani、Shadpour Mallakpour、Maliheh Safaiee
DOI:10.1055/s-2005-863706
日期:——
1,3-dichloro-5,5-dimethylhydantoin (DCH) and 1,3-dibromo-5,5-dimethylhydantoin (DBH) were used as effective oxidizing agents for the oxidation of urazoles and bis-urazoles to their corresponding triazolinediones under mild conditions at room temperature with good to excellent yields.