Acidic ionic liquid based on 1-methyl-3-benzyl imidazole cation, synthetic method and use
A technology of acidic ionic liquid and benzyl imidazolium, which is applied in the field of Brnsted acidic ionic liquid and its synthesis, can solve the problems of easily causing side reactions, strong corrosion of protonic acid, etc., and achieve convenient separation, mild conditions and high yield high effect
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Embodiment 1
[0063] The synthesis of embodiment 1 ionic liquid 2b
[0064] Synthesis of Chloride 1a
[0065] a. In a 50ml three-neck flask equipped with mechanical stirring, first dissolve 5g of the reaction substrate 1-methylimidazole in 25ml of toluene, start stirring to make the reactant homogeneous, then place the reactant in an ice-water bath, and keep it at 0°C 1.15 equivalents of benzyl chloride was added dropwise, and the reaction was carried out for 8 hours;
[0066] b. Insulate and react overnight. After reacting at room temperature for 24 hours, heat up to 65°C and react for 24 hours. Thin-layer chromatography tracks the reaction. The reaction system is in a nitrogen environment and reacts under dark conditions;
[0067] c, post-treatment: first lower the temperature of the reaction mixture to room temperature, the reaction system will be divided into two phases, the yellow oily phase of the lower layer of the system is the crude product generated, and the upper layer is the re...
Embodiment 2
[0076] The synthesis of embodiment 2 ionic liquid 2c
[0077] Synthesis of Chloride 1a
[0078]a. In a 50ml three-neck flask equipped with mechanical stirring, first dissolve 5g of the reaction substrate 1-methylimidazole in 25ml of toluene, start stirring to make the reactant homogeneous, then place the reactant in an ice-water bath, and keep it at 0°C 1.10 equivalents of benzyl chloride was added dropwise, and the reaction was carried out for 8 hours;
[0079] b. Insulate and react overnight. After reacting at room temperature for 24 hours, heat up to 70°C and react for 24 hours. Thin-layer chromatography tracks the reaction. The reaction system is in a nitrogen environment and reacts under dark conditions;
[0080] c, post-treatment: first lower the temperature of the reaction mixture to room temperature, the reaction system will be divided into two phases, the yellow oily phase of the lower layer of the system is the crude product generated, and the upper layer is the rea...
Embodiment 3
[0087] The synthesis of embodiment 3 ionic liquid 2e
[0088] Synthesis of Chloride 1a
[0089] a. In a 50ml three-neck flask equipped with mechanical stirring, first dissolve 5g of the reaction substrate 1-methylimidazole in 25ml of xylene, start stirring to make the reactants homogeneous, place the reactants in an ice-water bath, and mix with 1 1.12 equivalents of benzyl chloride was added dropwise at ℃, and the reaction was carried out for 8 hours;
[0090] b. Insulate and react overnight. After reacting at room temperature for 24 hours, heat up to 72°C and react for 24 hours. Thin-layer chromatography tracks the reaction. The reaction system is in a nitrogen environment and reacts under dark conditions;
[0091] c, post-treatment: first lower the temperature of the reaction mixture to room temperature, the reaction system will be divided into two phases, the yellow oily phase of the lower layer of the system is the crude product generated, and the upper layer is the react...
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