Method for preparing antioxidant
A technology of di-tert-butyl and hydroxyphenyl, which is applied in the field of preparation of antioxidant-N.N'-di[2-ethyl-3 propionate group] oxalamide, which can solve the problem of low yield and long reaction time and other problems to achieve the effect of increasing yield, improving product quality and shortening reaction time
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[0011] Put 150 grams of 3-(3.5 di-tert-butyl-4-hydroxyphenyl) methyl propionate, 42.4 grams of N.N'-dihydroxyethyl oxalamide, 50 ml of xylene, and 1.5 grams of alkyl stannic acid into 500 ml In the four-neck flask, under the protection of nitrogen, fully mix and stir, and heat the material to 160-190 ° C for 6 hours, after dissolution, decolorization, hot filtration, cooling, crystallization, and drying, N.N'-di[2 -Ethyl-3 (3.5 di-tert-butyl-4-hydroxyphenyl) propionate group] oxamide 140.5 grams, yield 84%, mother liquor recovery can obtain 1.5 grams, yield 9%, total yield is 93 %.
[0012] Reaction equation of the present invention is:
[0013]
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