Method for synthesizing benzoquinone compound through catalytic oxidation of phenol compound
A phenolic compound, catalytic oxidation technology, applied in the preparation of quinone oxide, organic chemistry, etc., to achieve the effects of environmental friendliness, mild reaction conditions and good selectivity
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Embodiment 1
[0025] Add 0.1 mmol of 2,3,6-trimethylphenol, benzotrifluoride, solid catalyst onion carbon, and oxidant tert-butyl hydroperoxide into a closed glass container for mixing, and then ultrasonicate to form a suspension (5 min). Among them, benzotrifluoride is 5ml, and the molar ratio of onion carbon to 2,3,6-trimethyl-p-phenol is 6.66:1. The molar ratio of oxidizing agent to 2,3,6-trimethyl-p-phenol is 3.6:1. The mixed suspension was placed in an oil bath and heated to 80 °C under stirring. After reacting for 12 hours, take out reaction vessel from oil bath, cool to room temperature, pour out liquid-solid mixture, it is filtered, obtain solid catalyst and remaining liquid phase mixture, add a certain amount of internal standard (ethylbenzene), to This liquid phase mixture is analyzed, and the retention time ( figure 1 ) are: tert-butanol 6.9min, trifluorotoluene 7.4min, 2,3,6-trimethyl-p-benzoquinone 9.91min, 2,3,6-trimethylphenol 9.98min, ethylbenzene 8.4min. The selectivity ...
Embodiment 2
[0027] Add 0.1 mmol of 2,3,6-trimethylphenol, benzotrifluoride, solid catalyst onion carbon, and oxidant tert-butyl hydroperoxide into a closed glass container for mixing, and then ultrasonicate to form a suspension (5 min). Among them, benzotrifluoride is 5ml, and the molar ratio of onion carbon to 2,3,6-trimethylphenol is 6.66:1. The molar ratio of oxidizing agent to 2,3,6-trimethylphenol is 3.6:1. The mixed suspension was placed in an oil bath and heated to the temperature shown in Table 1 under stirring conditions. After reacting for 12 hours, take out reaction vessel from oil bath, cool to room temperature, pour out liquid-solid mixture, it is filtered, obtain solid catalyst and remaining liquid phase mixture, add a certain amount of internal standard (ethylbenzene), to The liquid phase mixture is analyzed, and the conversion rate of 2,3,6-trimethylphenol and the selectivity results of 2,3,6-trimethyl-p-benzoquinone are shown in Table 1. It can be seen that the temperatu...
Embodiment 3
[0032]Add 0.1 mmol of 2,3,6-trimethylphenol, trifluorotoluene, solid catalyst onion carbon, and oxidant tert-butyl hydroperoxide into a closed glass container and mix them, and form a suspension under ultrasonic treatment (5 minutes). Among them, benzotrifluoride is 5ml, and the molar ratio of onion carbon to 2,3,6-trimethylphenol is 6.66:1. The molar ratio of oxidizing agent to 2,3,6-trimethylphenol is 3.6:1. The mixed suspension was placed in an oil bath and heated to 80 °C under stirring. Reaction time to Table 2, take out reaction vessel from oil bath, cool to room temperature, pour out liquid-solid mixture, it is filtered, obtain solid catalyst and remaining liquid phase mixture, add a certain amount of internal standard (ethylbenzene), The liquid phase mixture is analyzed, and the conversion rate of 2,3,6-trimethylphenol and the selectivity of 2,3,6-trimethyl-p-benzoquinone are measured. The results are shown in Table 2. It can be seen that prolonging the time is benefi...
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