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Alexandr Afroimovich Grinberg

Jury Ivanovich Michurov

Yakov Abramovich Gurvich

Alexandr G Liakumovich

Valerian Mikhailovich Sobolev

Boris Izrailevich Pantukh

Grigory I Rutman

Vladimir Avgustovich Yanshevsky

Nina Vasilievna Zakharova

Alexandr Grigorievich Liakumovich

Simona T Kumok

Evgeny L Styskin

Felix Borisovich Gershanov

Olga Fedorovna Starikova

Almira Mudarisovna Nafikova

Grigory Iosifich Rutman

A method of producing 2,2'-methylenebis(4,6-dialkylphenols) residing in that 2,4-dialkylphenols interact with acetals in the presence of an acid catalyst at a temperature from 30.degree. C to 140.degree. C with the formation of a reaction mixture containing the desired product and with subsequent separation of the desired product from said mixture, the starting reagents being taken in amounts of 1 mole of 2,4-dialkylphenol per 1-10 moles of acetal. The method is technologically simple and accomplished without the formation of waste water.

Method of producing 2,2 '-methylenebis(4,6-dialkylphenols)

A method of producing 2,6-dialkyl- and 2,6-diaralkyl-substituted derivatives of p-cresol of the general formula ##SPC1## Wherein R signifies an alkyl group having from 4 to 12 carbon atoms or ##SPC2## Comprising subjecting phenol to alkylation with olefines having from 4 to 12 carbon atoms or with styrene at a temperature of 50.degree.-150.degree.C in the presence of a catalyst, namely, aluminum, taken in an amount of 0.1-5 wt.% of phenol. 2,6-Dialkyl phenol or 2,6-diaralkyl phenol resulting after from the alkylation is treated with a mixture of formaldehyde and dimethylamine or with a product of their interaction having the formula ##EQU1## at a temperature of 20.degree.-100.degree.C with subsequent catalytic hydrogenolysis of N,N-dimethyl(3,5-dialkyl-4-hydroxybenzyl)/amine or N,N-dimethyl(3,5-diaralkyl-4-hydroxybenzyl/amine at a temperature of 80.degree.-200.degree.C., molar ratio of hydrogen to the product being treated of 1-5:1 and space velocity of 0.1-2 hour.sup..sup.-1. The products produced by said method feature a high degree of purity, and they can be employed as effective inhibitors of thermooxidation degradation of polymers and hydrocarbon fuels, and also as intermediates for producing p-cresol, and 2-alkyl- and 2-aralkyl-substituted derivatives of p-cresol.

Method of producing 2,6-dialkyl- and 2,6-diaralkyl-substituted

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Alexandr Afroimovich Grinberg