Improved Regioselective Mononitration of o-Xylene over HBEA-500 Zeolite Catalyst

Shi, Chun J.; Tai, Yan F.; Liu, Hong T.

doi:10.5012/bkcs.2013.34.11.3485

Cited by 2 publications

(1 citation statement)

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“…10 In the recent work of the Chun J Shi, superior selectivity for production of 4,4'-dibromo-2-nitrobiphenyl was achieved at low conversion catalyzed by HBEA-500 with nitric acid/acetic anhydride as nitration agent. 11 In the hope of improving the selectivity of 4,4'-dibromo-2-nitrobiphenyl in the nitrogen dioxide and molecular oxygen system, hydrogen and its metal ions exchanged BEA and ZSM-5 zeolites were employed. Zeolites facilitated the reaction and gave a high yield as compared with no catalysts.…”

Section: Methodsmentioning

confidence: 99%

Regioselective Nitration of Inactive 4,4-Dibromobiphenyl with Nitrogen Dioxide and Molecular Oxygen over Zeolites: An Efficient Preparation of 4,4'-Dibromo-2-nitrobiphenyl

Wang¹,

Peng²,

Chen³

2014

Journal of the Korean Chemical Society

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In the presence of zeolites, 4,4'-dibromobiphenyl could be region-selectively nitrated by the action of nitrogen dioxide and molecular oxygen. The ratio of 4,4'-dibromo-2-nitrobiphenyl to 4,4'-dibromo-3-nitrobiphenyl could reach 14 in a high yield of 90%. Zeolites could be easily regenerated by heating and reused four times to give the results similar to those obtained with fresh catalyst. Compared with the classic nitration method, no nitric acid and sulfuric acid were used, which suggested that the method was an environmentally economic process.

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Section: Methodsmentioning

confidence: 99%