Paper
Dalton Transactions
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Oxidation of secondary amines to
nitrones
A 25 mL round bottom flask was charged sequentially with a
catalyst, CH3OH (5 mL), and H2O2 (3 mmol) and then stirred
at room temperature for 10 minutes. Dibenzylamine (1 mmol)
was added to the reaction mixture and the temperature of the
reaction mixture was raised to 60 °C. Progress of the reaction
with time was monitored by thin layer chromatography (SiO2).
At the end of the reaction the catalyst was filtered over mem-
brane filter paper and reused for subsequent runs. The filtrate
thus obtained was treated with MnO2 to decompose the excess
H2O2. The treated reaction mixture was filtered to remove solid
MnO2 and then concentrated over rotavapor under reduced
pressure. Organic layer was extracted with CH2Cl2 and dried
over anhydrous sodium sulfate. The product was purified by
column chromatography over silica gel. Conversion of the
product was determined by GC-MS analysis.
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We kindly acknowledge the Director, IIP for his kind per-
mission to publish these results. We are thankful to the
Analytical Science Division of IIP for help in the analyses of
the samples. For the HRTEM analysis, the DST unit of
Nanoscience, IIT Chennai is kindly acknowledged.
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