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Citation: CHENG Guang-Bin, LÜ Chun-Xu, PENG Xin-Hua. Regioselective Synthesis of Mononitrochlorobenzene (Ⅱ)Nitration with Nitrogen dioxide[J]. Chinese Journal of Applied Chemistry, ;2002, 19(2): 181-183. shu

Regioselective Synthesis of Mononitrochlorobenzene (Ⅱ)Nitration with Nitrogen dioxide

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)

Ozone-mediated nitration of chlorobenzene with nitrogen dioxide over solid acid catalysts is expected to be a green process. The reaction was carried out at ca. 0℃. It was found that the solid acid catalysts of SO₄^2-/TiO₂ and SO₄^2-/ZrO₂ and a series of SO₄^2-/TiO₂-ZrO₂ catalysts exhibited a fairly good activity for the nitration reaction, whereas SO₄^2-/TiO₂-ZrO₂(atomic ratio 1:1) gives yield of 62.4% and SO₄^2-/TiO₂-ZrO₂(molar ratio 3:1) shows a good para selectivity in CH₂Cl₂ solvent. The ortho para isomer ratios(ortho/para) of the nitration products were varied in range from 1.11 to 0.36. This phenomenon is interpreted in terms of acid amount and acid strength of solid acid catalysts.
- chlorobenzene,
- catalytic nitration,
- nitrogen dioxide,
- solid acid,
- ozone activation
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