BAHRAMI AND KHODAMORADY
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quantitatively by simple filtration after the addition of
ethanol to the reaction mixture. We believe that the
methodology presented opens new possibilities for medic-
inal chemistry and materials science.
3.3 | Preparation of BNPs
A solution of 3.25 g of NaOH in 25 mL of distilled water
was added to a solution of 10 g of Al(NO3)3⋅9H2O in
15 mL of distilled water drop by drop under vigorous stir-
ring (Scheme 1). This milky mixture was mixed in an
ultrasonic bath at 25°C for 3 h. The obtained BNPs were
filtered and washed with distilled water and were kept
in an oven at 220°C for 4 h.[11]
ACKNOWLEDGEMENT
The authors acknowledge the Razi University Research
Council for support of this work.
3.4 | Preparation of BNPs‐
SiO2@(CH2)3NHSO3H
ORCID
BNPs (1 g) were dispersed in a mixture of water (10 mL)
and ethanol (50 mL). After that tetraethyl orthosilicate
(TEOS; 2 mL) and ammonium solution (10 mL) were
added to the mixture. The mixture was kept for 38 h with
continuous stirring at 25°C. The white powder was fil-
tered, washed with ethanol and dried in vacuum at
80°C. Then, (3‐aminopropyl)triethoxysilane (APTES)
was added to BNPs‐SiO2 dispersed in toluene under
reflux at 110°C for 24 h. In the next step, BNPs‐
SiO2@(CH2)3NH2 was washed with ethanol and water
and dried at 70°C. In the final step, for the sulfonation
of BNPs‐SiO2@(CH2)3NH2, ClSO3H was added to BNPs‐
SiO2@(CH2)3NH2 at room temperature for 5 h. The
sulfonated BNPs were then washed with hot deionized
water and were kept in an oven at 80°C for 2 h.
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3.5 | General Procedure for Synthesis of
Sulfones
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A mixture of sulfide (1 mmol), 30% H2O2 (2 mmol) and
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(4 × 5 mL), and the organic layer was dried over anhy-
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4 | CONCLUSIONS
[16] J. Fink, High Performance Polymers, William Andrew Inc,
Norwich, NY 2008 209.
In summary, BNPs‐SiO2@(CH2)3NHSO3H is an
extremely efficient heterogeneous catalyst for selective
oxidation of various sulfides to sulfones in the presence
of H2O2. The benefits are excellent yields, inexpensive
nature and availability of the oxidant, easy and clean
workup process, use of safe solvent and mild conditions.
It was observed that the catalyst can be easily recovered
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