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Ionic Liquids 英超联赛直播液体

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邓友全,石峰
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本发明涉及二氧化碳与环氧化合物通过催化环加成制相应的环状碳酸酯的方法。其特征是采用由含氮杂环化合物卤化烷基吡啶或卤化1,3-二烷基咪唑与非金属卤化物构成的室温下呈液体状态的英超联赛直播液体为催化剂,碱金属卤化物或四丁基溴化铵作为反应的助催化剂,在反应温度为100至140℃,二氧化碳初始压力为 1.5-4.5MPa,反应时间为4-8小时,催化剂用量为环氧化合物量的0.2-2.5mol%条件下,实现二氧化碳与环氧化合物通过催化环加成制相应 的环状碳酸酯。该方法的主要特点是室温英超联赛直播液体催化活性高,反应条件相对温和,操作简便,产物分离和催化剂回收容易,室温英超联赛直播液体催化剂构成相对简单,且 可重复使用。

邓友全,彭家建,石峰. 合成环状碳酸酯的方法. Cn1343668. 2005.

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.

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.

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

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.