Method for catalytically synthesizing n-propyl cinnamate based on choline chloride eutectic solvent
A technology of deep eutectic solvent and choline chloride, which is applied in chemical instruments and methods, preparation of organic compounds, physical/chemical process catalysts, etc., can solve problems such as long reaction time, large amount of alcohol, and poor storage durability. Achieve the effects of simple preparation method, mild reaction conditions, and low equipment corrosion
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Embodiment 1
[0016] Weigh 8.89g (0.06mol) of cinnamic acid and 10.82g (0.18mol) of n-propanol respectively, add the two into a three-necked flask, stir and heat to 73°C, then add 3.94g (20%) of catalyst into the three-necked flask ChCl-PTSA was reacted at this temperature, and the reaction time was 4 h; after the reaction was completed, the reaction solution was separated into water and oil phases through a separatory funnel while it was hot, and the water phase was vacuum-dried at 65°C to recover the catalyst; Distill the oil phase under atmospheric pressure to remove excess n-propanol, and then collect fractions through vacuum distillation (temperature 140-145°C, pressure 1.3kPa) to obtain a colorless and transparent oily liquid, which is the target product propyl cinnamate. Its yield is 87.19%.
Embodiment 2
[0018] Weigh 8.89g (0.06mol) of cinnamic acid and 7.21g (0.12mol) of n-propanol respectively, add the two into a three-necked flask, stir and heat to 93°C, then add 1.61g (10%) of catalyst into the three-necked flask ChCl-PTSA and react at this temperature, the reaction time is 2h; After the reaction, the reaction solution is separated into water and oil phases through a separatory funnel while it is hot, and the water phase is vacuum-dried at 65 ° C to recover the catalyst; The oil phase is first distilled at atmospheric pressure to remove excess n-propanol, and then distilled under reduced pressure (temperature 140-145°C, pressure 1.3kPa) to collect fractions to obtain a colorless and transparent oily liquid, which is the target product propyl cinnamate. The yield was 82.47%.
Embodiment 3
[0020] Weigh 8.89g (0.06mol) of cinnamic acid and 7.21g (0.12mol) of n-propanol respectively, add the two into a three-necked flask, stir and heat to 93°C, then add 4.83g (30%) of catalyst into the three-necked flask ChCl-PTSA and react at this temperature, the reaction time is 3h; after the reaction is completed, the reaction solution is separated into water and oil two phases through a separatory funnel while it is hot, and the water phase is vacuum-dried at 65 ° C to recover the catalyst; The oil phase is first distilled at atmospheric pressure to remove excess n-propanol, and then distilled under reduced pressure (temperature 140-145°C, pressure 1.3kPa) to collect fractions to obtain a colorless and transparent oily liquid, which is the target product propyl cinnamate. The yield was 90.75%.
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