Other

Rufina Alexandrovna Filippova

Vladimir Avgustovich Yanshevsky

Jury Ivanovich Michurov

Valerian Mikhailovich Sobolev

Yakov Abramovich Gurvich

Izrail M Belgorodsky

Igor Jurievich Logutov

Ljudmila Vasilievna Berezova

Nokhum Davidovich Gilchenok

Jury Nikolaevich Juriev

Evgeny Semenovich Zelikman

Vladimir Leonidovich Klimenko

Sofya Alexandrovna Egoricheva

Jury Leonidovich Moskovich

Dmitry Vasilievich Mushenko

Viktor Karlovich Tsyskovsky

Sergei Gerasimovich Vyborov

A method for preparing 2,6-ditert.butylphenol which comprises alkylation of phenol in the presence of monotert.-butylphenol and a catalyst, viz. aluminium dissolved in phenol with gradually lowering the process temperature from 120.degree. to 50.degree. C and reducing the concentration of isobutylene in the mixture of isomeric butenes from 80 to 1.5 mol.%, followed by isolation of the desired product. The method according to the present invention makes it possible to achieve a high degree of conversion of isobutylene without impairing quality of the desired product. The amount of by-products formed in the process is 2-3 times as less as in the prior art methods.

Method for preparing 2,6-ditert.butylphenol

A method for preparing dicarboxylic acids by subjecting cycloolefins to ozonolysis in a medium of lower monocarboxylic acids so as to form an ozonalyzate; treating the ozonalyzate with a solution of hydrogen peroxide; passing the thus obtained mixture through a solid acid catalyst, such as an Amberlite IR-120 cation-exchange resin; and subjecting the thus obtained catalyzed product first to thermal treatment at a temperature of from 50.degree. to 80.degree.C and then to thermal decomposition at a temperature of from 90.degree. to 110.degree.C to form desired dicarboxylic acids such as succinic, suberic or 1,10-decanedicarboxy acids, depending on the starting cycloolefin, in a yield 98 per cent of the theoretical value and of 99.5 per cent purity.

Method for preparing dicarboxylic acids

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Novokuibyshevsk, undefined

Rufina Alexandrovna Filippova