Asymmetric hindered phenol antioxidant and synthetic method thereof
An anti-oxidant and synthetic method technology, applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of low product conversion rate, achieve simplified operation steps, high yield, and shortened reaction time Effect
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Embodiment 1
[0040] The chemical name is 2,4-dimethyl-6-styrene phenol, an asymmetric hindered phenol antioxidant, and its structural formula is:
[0041]
[0042] Obtained by the reaction of 2,4-dimethylphenol and styrene, the structural reaction formula is:
[0043]
[0044] The synthesis of this asymmetric type hindered phenolic antioxidant comprises the following steps:
[0045] 3) Dissolve 155g of liquid 2,4-dimethylphenol under normal pressure, the molecular formula is
[0046]
[0047]and 20ml of boron trifluoride ether solution were put into a 1000ml four-necked bottle equipped with a reflux condenser, a constant pressure dropping funnel and a stirrer, and mixed at a speed of 600r / min to evenly heat up to 45°C. Add 300g of liquid styrene dropwise to the reactor (to ensure that the molar ratio of ingredients 2,4-dimethylphenol: styrene: boron trifluoride ether is controlled within 1: 1.1-3.5: 0.01-0.05) and Stir evenly at a speed of 670r / min, add dropwise for 2 hours, and...
Embodiment 2
[0066] The chemical name is 2,4-dimethyl-6-styrene phenol, an asymmetric hindered phenol antioxidant, and its structural formula is:
[0067]
[0068] Obtained by the reaction of 2,4-dimethylphenol and styrene, the structural reaction formula is:
[0069]
[0070] The synthesis of this asymmetric type hindered phenolic antioxidant comprises the following steps:
[0071] 4) Under normal pressure, 160g of liquid 2,4-dimethylphenol, the molecular formula is
[0072]
[0073] and 18ml of boron trifluoride ether solution were put into a 1000ml four-necked bottle equipped with a reflux condenser, a constant pressure dropping funnel and a stirrer, and mixed at a speed of 650r / min to evenly heat up to 48°C. Add 310g of liquid styrene dropwise to the reactor (to ensure that the molar ratio of ingredients 2,4-dimethylphenol: styrene: boron trifluoride ether is controlled within 1: 1.1-3.5: 0.01-0.05) and Stir evenly at a speed of 680r / min, add dropwise for 2 hours, and end th...
Embodiment 3
[0092] The chemical name is 2,4-dimethyl-6-styrene phenol, an asymmetric hindered phenol antioxidant, and its structural formula is:
[0093]
[0094] Obtained by the reaction of 2,4-dimethylphenol and styrene, the structural reaction formula is:
[0095]
[0096] The synthesis of this asymmetric type hindered phenolic antioxidant comprises the following steps:
[0097] 5) Dissolve 165g of liquid 2,4-dimethylphenol under normal pressure, the molecular formula is
[0098]
[0099] and 20ml of boron trifluoride ether solution were put into a 1000ml four-necked bottle equipped with a reflux condenser, a constant pressure dropping funnel and a stirrer, and mixed at a speed of 650r / min to evenly heat up to 50°C. Add 320g of liquid styrene dropwise to the reactor (to ensure that the molar ratio of ingredients 2,4-dimethylphenol: styrene: boron trifluoride ether is controlled within 1: 1.1-3.5: 0.01-0.05) and Stir evenly at a speed of 690r / min, add dropwise for 2 hours, an...
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