616-55-7Relevant articles and documents
Alkylation of Phenols with tert-Butanol Catalyzed by H-Form of Y Zeolites with a Hierarchical Porous Structure
Bayguzina,Makhiyanova,Khazipova,Khusnutdinov
, p. 1554 - 1559 (2019/10/14)
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.
Cyclopentenone formation via hydrogen activation in the reactions of chromium carbene complexes with alkynes
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.
, p. 1359 - 1376 (2007/10/02)
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.
Trans-substitution and equilibration of phenols. Part IV. The influence of various catalysts on the trans-tert-butylation reaction of phenols; mechanistic aspects
Willemse, F. R. J.,Kooyman, E. C.,Lamoen, H. B. van,Vos, D. de,Wolters, J.
, p. 206 - 209 (2007/10/02)
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.