Regioselective Mononitration of Aromatic Compounds Using Keggin Heteropolyacid Anion Based Br酶nsted Acidic Ionic Salts

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• 作者：Hongwei Yang ; Xiufang Qi ; Liang Wen ; Chunxu Lu ; Guangbin Cheng
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2011
• 出版时间：October 5, 2011
• 年：2011
• 卷：50
• 期：19
• 页码：11440-11444
• 全文大小：713K
• 年卷期：v.50,no.19(October 5, 2011)
• ISSN：1520-5045

文摘

Novel Keggin heteropolyacid anion based Br酶nsted acidic ionic salts [SO₃H(CH₂)₄Mim]_nH_3鈥?i>nPMo₁₂O₄₀ (n = 1, 2, 3) were synthesized and used as catalysts in the nitration of aromatic compound in HNO₃ (67%). The catalytic activity was in the order of [(CH₂)₄SO₃HMim]₃PMo₁₂O₄₀ > [(CH₂)₄SO₃HMim]₂HPMo₁₂O₄₀ > [(CH₂)₄SO₃HMim]H₂PMo₁₂O₄₀. The effect of catalyst loading, quantity of nitro acid and temperature on nitration of toluene was discussed, and 87.7% yield and good para selectivity with 1.19 ratio of ortho to para can be obtained with optimized catalyst [(CH₂)₄SO₃HMim]₃PMo₁₂O₄₀. The catalyst can be easily separated from the products and recycled for three times without significant loss of activity.