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          Ionic Liquids 離子液體

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          鄧友全,石峰
          391.22 KB

          本發明涉及二氧化碳與環氧化合物通過催化環加成制相應的環狀碳酸酯的方法。其特征是采用由含氮雜環化合物鹵化烷基吡啶或鹵化1,3-二烷基咪唑與非金屬鹵化物構成的室溫下呈液體狀態的離子液體為催化劑,堿金屬鹵化物或四丁基溴化銨作為反應的助催化劑,在反應溫度為100至140℃,二氧化碳初始壓力為 1.5-4.5MPa,反應時間為4-8小時,催化劑用量為環氧化合物量的0.2-2.5mol%條件下,實現二氧化碳與環氧化合物通過催化環加成制相應 的環狀碳酸酯。該方法的主要特點是室溫離子液體催化活性高,反應條件相對溫和,操作簡便,產物分離和催化劑回收容易,室溫離子液體催化劑構成相對簡單,且 可重復使用。

          鄧友全,彭家建,石峰. 合成環狀碳酸酯的方法. Cn1343668. 2005.

          彭家建 / 鄧友全
          150.00 KB

          With equal molar ratio of benzene and hydrogen peroxide and without any additional volatile organic solvent, a green aqueous–ionic liquid biphasic hydroxylation of benzene to phenol with hydrogen peroxide as oxidant and metal dodecanesulfonate salts such as ferric tri(dodecanesulfonate) as catalyst was conducted with excellent selectivity and enhanced conversion.

          ★★★★☆ Jiajian Peng, Feng Shi, Yanlong Gu and Youquan Deng. Green Chemistry, 2003, 5, 224–226.

          彭家建 / 鄧友全
          53.67 KB

          Under mild conditions and without any additional organic solvents, Beckmann rearrangements of several ketoximes were performed in the catalytic media consisting of room temperature ionic liquid based on 1,3-dialkylimidazolium or alkylpyridinium salts and phosphorated compounds. Excellent conversion and selectivity was achieved for cyclohexanone oxime as the substrate, while Beckmann fragmentation of cyclopentanone oxime was observed.

          ★★★★☆ J. Peng, Y. Deng : Tetrahedron Letters 42 (2001) 403–405.

          彭家建 / 鄧友全
          75.24 KB

          In room temperature ionic liquids based on 1-n-butyl-3-methylimidazolium and n-butylpyridinium salts, cycloaddition of carbon dioxide to propylene oxide without any additional organic solvents has been investigated. It was found that 1-n-butyl-3-methylimidazolium tetraÑuoroborate was the most active catalyst with almost 100% selectivity, and a suitable CO oxide molar ratio was needed for high conversion. The ionic liquid used 2Èpropylene as catalyst for the reaction was recyclable.

          ★★★☆☆ Jiajian Peng and Youquan Deng. New J. Chem., 2001, 25, 639È641

          彭家建 / 鄧友全
          56.48 KB

          3,4-Dihydropyrimidin-2(1H)-ones were synthesised in high yields by one-pot three-component Biginelli condensation in the presence of room temperature ionic liquids such as 1-n-butyl-3-methylimidazolium tetrafluoroborate (BMImBF4) or hexafluorophosphorate (BMImPF6) as catalysts under solvent-free and neutral conditions.

          ★★★★☆ Jiajian Peng and Youquan Deng. Tetrahedron Letters 42 (2001) 5917–5919.

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