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In a typical procedure, 1.0 mmol of nitroaromatic sub-
strate was taken in a two neck round bottom flask dis-
persed in 15 ml of distilled water. To this aqueous
suspension, 3 mmol of NaBH4 and the synthesized NPs
(5 wt% of the nitro-substrate) were added. The contents
were then kept under constant stirring at the rate of
500–700 rpm at room temperature. Progress of the reac-
tion was monitored by thin layer chromatography (TLC).
After the completion of the reaction, the NP was sepa-
rated from the reaction mixture by an external magnet.
The catalyst was first washed with distilled water (3 x
15 ml) to remove the excess borohydride and then with
acetone (3 x 15 ml) to eliminate any traces of organic sub-
stance. The filtrate was dried using a rotary evaporator
and the remaining mass containing the reaction mixture
was extracted with HPLC grade ethyl acetate (3 x 20 ml)
and dried over anhydrous Na2SO4, the conver-
sion/selectivity and product identification were per-
formed by GC–MS analysis.
ACKNOWLEDGMENTS
The authors thank Tezpur University, Science and Engi-
neering Research Board, New Delhi, India (SERB-DST
No: SB/FT/CS-048/2014) for financial support. SAIF,
North-Eastern Hill University Shillong is acknowledged
for TEM facilities.
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