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Citation: CHENG Guang-Bin, LÜ Chun-Xu, PENG Xin-Hua. Regioselective Synthesis of Mononitrochlorobenzene (Ⅰ) Nitration with Nitric Acid[J]. Chinese Journal of Applied Chemistry, ;2002, 19(3): 271-275. shu

Regioselective Synthesis of Mononitrochlorobenzene (Ⅰ) Nitration with Nitric Acid

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094

Corresponding author: CHENG Guang-Bin,
Received Date: 8 August 2001
Available Online: 29 October 2001
Fund Project: 江苏省自然科学基金(BK99071)资助项目 (BK99071)

The solid acid catalysts of SO₄^2-/TiO₂ and SO₄^2-/ZrO₂ and a series of SO₄^2-/TiO₂-ZrO₂ catalysts have been prepared and characterized by XRD, FTIR and TG DTA. The regioselectivities of chlorobenzene in mononitration with these catalysts were investigated. It was found that chlorobenzene is nitrated with high para selectivity in the presence of acetic anhydride using the solid acid as catalyst and a stoichiometric quantity of nitric acid. Over SO₄^2-/TiO₂-ZrO₂(atom ratio 1:2) catalyst, nitration of chlorobenzene gives a 70.2% yield of mononitro compounds, with an ortho para isomer ratio 0.29, greatly below 0.57 as sulfonitric acid as catalyst. The process is rapid, and the catalysts can be repeatedely used 4 times without reduction of ortho/para ratio of product.
- chlorobenzene,
- catalytic nitration,
- regioselective synthesis,
- solid acid
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