Preparation method of DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and intermediate of DOPO
An o-phenylphenol and compound technology, which is applied in chemical instruments and methods, compounds of Group 5/15 elements of the periodic table, and organic chemistry, etc. problems, to achieve the effect of simplifying production operations
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Embodiment 1
[0046] Example 1 Preparation of DOPO by the method of the present invention
[0047] 1. Add 100g o-phenylphenol (1eq, 0.588mol), 1g anhydrous zinc chloride (0.0125eq, 0.0073mol) and 80.7g phosphorus trichloride (1eq, 0.588mol) into a 500mL four-necked flask, and heat up to After reacting at 100° C. for 2 hours, continue to raise the temperature to 160° C. for 2 hours. The reaction was complete as detected by HPLC, and the reaction solution was directly used for the next reaction.
[0048] 2. Add 150 g of toluene and 5 g of diatomaceous earth to the reaction liquid in the previous step, stir at room temperature for 0.5 h, and filter to obtain a colorless clear liquid. 50 g of purified water was added to the filtrate, the temperature was raised to reflux for 4 h, and the reaction was detected by TLC to be complete. Cool down to 0°C, stir vigorously to precipitate a white solid, filter, wash the filter cake twice with 50 g of purified water, the filter cake is detected as a HPPA...
Embodiment 2
[0051] Example 2 Preparation of DOPO by the method of the present invention
[0052] 1. Add 100g of o-phenylphenol (1eq, 0.588mol), 1g of anhydrous zinc chloride (0.0125eq, 0.0073mol) and 112.98g of phosphorus trichloride (1.4eq) into a 500mL four-necked flask, and heat up to 80°C After reacting for 2 hours, continue to heat up to 180° C. for 2 hours, and the reaction is complete as detected by HPLC, and the reaction solution is directly used for the next reaction.
[0053]2. Add 150 g of toluene and 5 g of diatomaceous earth to the reaction liquid in the previous step, stir at room temperature for 0.5 h, and filter to obtain a colorless clear liquid. 50 g of purified water was added to the filtrate, the temperature was raised to reflux for 4 h, and the reaction was detected by TLC to be complete. Cool down to 0°C, stir vigorously to precipitate a white solid, filter, wash the filter cake twice with 50 g of purified water, collect the filter cake, and directly use it for the ...
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