- Alkylation of Phenols with tert-Butanol Catalyzed by H-Form of Y Zeolites with a Hierarchical Porous Structure
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tert-Butyl-substituted phenols have been synthesized via the reaction of phenol, o-, m-, and p-cresols with tert-butanol under the action of CBr4-promoted Y-zeolites in the H-form with a hierarchical porous structure.
- Bayguzina,Makhiyanova,Khazipova,Khusnutdinov
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p. 1554 - 1559
(2019/10/14)
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- LiAIH4 promoted reductive deoxygenation of hydroxybenzyl alcohols via benzoquinone methide intermediates
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Primary and secondary hydroxybenzyl alcohols react with LiAIH4 in chlorobenzene to give the corresponding alkylphenols. The reaction proceeds through the formation of benzoquinone methide as an intermediate. An example of [4+2] cycloaddition of benzoquinone methide is also reported.
- Baik, Woonphil,Lee, Hyun Joo,Koo, Sangho,Kim, Byeong Hyo
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p. 8125 - 8128
(2007/10/03)
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- Cyclopentenone formation via hydrogen activation in the reactions of chromium carbene complexes with alkynes
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The reactions of alkyl chromium carbene complexes with alkynes have been found to give cyclopentenones. Mechanisms are proposed to account for the formation of these products that involve metal hydride intermediates. As has been previously reported for tungsten, molybdenum alkyl complexes have been found to give 1,3-dienes rather than cyclopentenones. The difference between chromium and molybdenum and tungsten may be that a metal hydride intermediate can re-add to an olefin in the case of chromium rather than undergo reductive elimination. A mechanism for the formation of cyclopentenones involving a free vinylketene was ruled out on the basis of an experiment in which the free vinylketene was generated via thermolysis of a cyclobutenone and found not to give a cyclopentenone product but rather an intramolecular [2 + 2] cycloadduct.
- Challener, Cynthia A.,Wulff, William D.,Anderson, Benjamin A.,Chamberlin, Steve,Faron, Katherine L.,Kim, Oak K.,Murray, Christopher K.,Xu, Yao-Chang,Yang, Dominic C.,Darling, Stephen D.
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p. 1359 - 1376
(2007/10/02)
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- EQULIBRATION OF TERT-ALKYLPHENOLS (THERMODYNAMIC ANALYSIS OF THE ALKYLATION OF PHENOLS USING BRANCHED-CHAIN OLEFINS).
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The authors describe the results of a study to evaluate the thermodynamic properties of t-Alk PHI ; these results; combined with earlier results, have enabled the authors to complete a thermodynamic analysis of the process for preparing tertiary alkylphenols.
- Nesterova,Verevkin,Malova,Pil'shchikov
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p. 748 - 754
(2007/10/02)
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- Trans-substitution and equilibration of phenols. Part IV. The influence of various catalysts on the trans-tert-butylation reaction of phenols; mechanistic aspects
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The trans-tert-butylation reaction by 2,6-di-tert-butyl-4-methylphenol has been studied for a number of phenols in the presence of different catalysts.Equilibria, as well as reaction kinetics, have been investigated.The mechanism involves the intermediacy of a tert-butyl ether.This mechanism is supported both by the kinetics and the initially high ortho/para ratio as well as by the reversed substituent effect.
- Willemse, F. R. J.,Kooyman, E. C.,Lamoen, H. B. van,Vos, D. de,Wolters, J.
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p. 206 - 209
(2007/10/02)
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- N-carbamoyl imidazolidinones and imidazolidinethiones
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Compounds having the formula SPC1 As well as salts thereof, wherein n is 1 or 2, Y is 0, hydrogen or a straight- or branched chain alkyl residue having from 1 to 4 carbon atoms Z is 0 or S and when n is 1, R1 is a substituted or unsubstituted hydrocarbyl residue having from 1 to 20 carbon atoms and when n is 2, R1 is a substituted or unsubstituted hydrocarbyl residue having from 2 to 20 carbon atoms, are suitable as stabilisers of organic material.
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