In conclusion, A novel nano-Fe3O4@copoly[(styrene/acrylic acid)/grafted ethylene
oxide was synthesized and its application as a magnetic and recyclable phasetransfer
catalyst in the preparation of b-azido alcohols and b-nitro alcohols was
investigated. The experimental results showed that the regioselective ring opening
of epoxides in the presence of azide and nitro anions in aqueous medium led to the
corresponding products in 5–120 min and 78–99 % yield. In addition to the
recyclability of the catalyst via an external magnet, the short reaction times, high
product yield, regioselectivity, facile workup, and eco-friendly and green nature of
the procedure are notable advantages of this method.