- Thermolysis of 4-(ω-hydroxyalkyl)-2,6-di-tert-butylphenols
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The process of thermolysis of tert-butylated hydroxyalkyl phenols includes de-tert-butylation, etherification, and fragmentation of the hydroxyalkyl group. On the basis of the proposed schemes of the mechanism of thermal de-tert-butylation the path of the search for catalysts for the synthesis of 4-hydroxyalkylphenols is defined and transformations of the by-products into biologically active substances were considered.
- Krysin,Egorova,Vasil'Ev
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experimental part
p. 275 - 283
(2010/07/15)
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- Synthesis of benzotriazole monomer
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The synthesis of benzotriazole monomers and the use of the benzotriazole monomers and one or more other monomers to prepare ultraviolet (UV) light absorbing polymer compositions. The synthetic methods described in this application provide a significant improvement over the previous methods used to prepare benzotriazole monomers.
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Page/Page column 16
(2010/12/26)
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- Interaction of functionally-substituted 4-alkyl-2,6-di-tert-butylphenols with hydrohalic acids
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Reactions of 4-alkyl-2,6-di-tert-butylphenols containing OH, SH, COOH, and COOMe groups in their para substituents with hydrogen chloride and hydrohalic acids were studied. One-step transformations of 2,6-di-tert-butyl-4-(ω- hydroxyalkyl)phenols to the corresponding 4-(ω-halogenoalkyl)phenols, as well as of 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionic acid and its esters to phloretic acid were proposed. 4-(3-Mercaptopropyl)phenol upon heating with conc. HBr undergoes condensation to 3-(4-hydroxyphenyl)propyl 4-(3-mercaptopropyl)phenyl sulfide as the main product.
- Prosenko,Skorobogatov,Dyubchenko,Pinko,Kandalintseva,Shakirov,Pokrovsky
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p. 1119 - 1124
(2008/09/18)
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- Synthesis and antioxidant properties of sodium S-[3-(hydroxyaryl)propyl] thiosulfates and [3-(hydroxyaryl)propane]-1-sulfonates
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Sodium S-[3-(hydroxyaryl)propyl] thiosulfates and [3-(hydroxyaryl)propane]- 1-sulfonates with various spatial hindrance of their phenolic OH groups were synthesized from dialkylphenols via a number of intermediate products. On a model reaction of oxidation of methyl oleate in aqueous sodium dodecyl sulfate, the rate constants of the interaction of the synthesized compounds with lipoperoxide radicals were determined.
- Oleynik,Kuprina,Pevneva,Markov,Kandalintseva,Prosenko,Grigor'ev
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p. 1135 - 1143
(2008/09/17)
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- 2'-hydroxy-5'-(hydroxyalkyl)phenyl-2H-benzotriazoles
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The compounds 2'-hydroxy-5'-(hydroxyalkyl)phenyl-2H-benzotriazoles are useful as intermediate alcohols in the preparation of corresponding 2'-hydroxy-5'-acrylyloxyphenyl-2H-benzotriazole monomers, which in turn are copolymerizable with ethylenically unsaturated monomers, particularly acrylic monomers, to impart ultraviolet absorbing properties to the resulting copolymers.
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- THERMAL DE-TERT-BUTYLATION OF 2,6-DI-TERT-BUTYLPHENOL AND ITS DERIVATIVES
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When heated at 270-300 deg C, 2,6-di-tert-butylphenol and its 4-alkyl, 4-(chloroalkyl), 4-(hydroxyalkyl), and 4-(methoxycarbonyl) derivatives give the corresponding unsubstituted and 4-substituted 2-tert-butylphenols.Removal of the two tert-butyl groups from 2,6-di-tert-butylphenol is observed at temperatures above 300 deg C.
- Kun, O. B.,Nogina, N. I.,Ostashevskaya, L. A.,Egorov, E. M.,Kuzubova, L. I.,Krysin, A. P.
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p. 2375 - 2378
(2007/10/02)
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