Citation:
CAI Ke-Ying, HUANG Yao-Guo, ZONG Zhi-Min, WEI Xian-Yong. Reduction of Nitro Aromatic Compounds to Azoxy Compounds by Bismuth Oxide Hydroxide-Sodium Borohydride[J]. Chinese Journal of Applied Chemistry,
;2008, 25(3): 372-374.
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Bismuth oxide hydroxide was prepared by rapid precipitation from a solution of bismuth(Ⅲ) chloride with sodium hydroxide,which was used as a catalyst for the reduction of nitro aromatic compounds with sodium borohydride.The catalytic performance of bismuth oxide hydroxide and the effect of the amount of sodium borohydride on the reduction were investigated.The results showed that bismuth oxide hydroxide had a high activity and selectivity for the reduction under mild reaction conditions.At a mole ratio of 1.04:1 of sodium borohydride to each of nitro aromatic compounds in methanol and 2 h and r.t.,the corresponding azoxy compounds were prepared in 80.4%~96.9% yields.Moreover,no obvious deactivation was observed after five times recycling of the catalyst,which can be regenerated at 120℃ and then recycled very easily.
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Keywords:
- azoxybenzene,
- sodium borohydride,
- reduction,
- bismuth oxide hydroxide
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