Method of preparing 2,6-di-tert. butyl-4-methylphenol

Details Method of preparing 2,6-di-tert. butyl-4-methylphenol Method of preparing 2,6-di-tert. butyl-4-methylphenol

C - Chemistry, Metallurgy

07

C

260/621.7

C07C 39/06 (2006.01)

Patent

CA 1093100

METHOD OF PREPARING 2,6-DI-TERT.BUTYL-4-METHYLPHENOL Abstract of the Disclosure A method of preparing 2,6-di-tert.butyl-4-methylphenol comprising reacting 2,6-di-tert.butylphenol with formaldehyde and dimethylamine in a medium of methanol or ethanol at a tem- perature within the range of from 80 to 90°C to give a reac- tion mass containing N,N-dimethyl-3,5-di-tert.butyl-4- hydroxybenzylamine and readily-volatile products such as methanol or ethanol, water and bis-amine. The readily-volati- le products are removed from the reaction mass by heating thereof to a temperature within the range of from 110 to 140°? simultaneously with purging said reaction mass with an inert gas containing a secondary amine in an amount of from 5 to 50% by volume. The reafter,N,N-dimethyl-3,5-di-tert.butyl- 4-hydroxybenzylamine is contacted with hydrogen at a molar ratio therebetween of 1:4-10 respectively on a hydrogenation catalyst at a temperature ranging from 120 to 160°C, to give the desired product which is then isolated. The method according to the present invention makes it possible to increase the desired product yield and improve quality thereof as compared to the prior art methods. The yield of the desired product is 98.7% as calculated per the starting raw materials. The method is technologically simple.

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