1194-98-5Relevant articles and documents
Access to functionalized quinones via the aromatic oxidation of phenols bearing an alcohol or olefinic function catalyzed by supported iron phthalocyanine
Zalomaeva, Olga V.,Sorokin, Alexander B.
, p. 1768 - 1773 (2006)
The controlled oxidation at only one position of compounds with several oxidizable sites, while keeping the other sites intact, has been demonstrated for phenols bearing alcohol or olefinic functional groups. Iron tetrasulfophthalocyanine supported on silica was found to be an efficient catalyst for the preparation of functionalized quinones under mild conditions, with tert-butylhydroperoxide as the oxidant. A novel rapid and mild one-pot procedure for the covalent grafting of iron tetrasulfophthalocyanine onto silica has been developed. The supported catalyst was characterized by chemical analysis, a specific surface study, UV-vis spectroscopy and XPS. A non-radical mechanism for this unusual selective oxidation has been revealed by 18O labelling experiments. The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.
Ulrich et al.
, p. 2437,2438 (1974)
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Rao et al.
, p. 2548 (1975)
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Scott,Beadling
, p. 281,283 (1974)
CoTPP-CATALYZED REARRANGEMENT OF 1.4-ENDOPEROXIDES
Balci, Metin,Suetbeyaz, Yasar
, p. 311 - 314 (1983)
Bicyclic endoperoxides with strained and perturbed diene moiety have been submitted to CoTPP-catalyzed rearrangement.Side reaction, like formation of epoxyenone, has been suppressed and yield of the formation of bisepoxides highly increased.
Preparation method of 2, 5-dihydroxy benzaldehyde
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Paragraph 0017; 0020-0022; 0025-0026, (2021/07/17)
The invention discloses a preparation method of 2, 5-dihydroxy benzaldehyde, which is used for preparing an important intermediate of a liquid crystal compound, and relates to the technical field of liquid crystals. The preparation method comprises the steps of by taking p-methoxyphenol as a raw material, alkyl nitrile as a solvent, paraformaldehyde as a formylation reagent and magnesium chloride and triethylamine as catalysts, reacting for 2-4 hours, extracting reaction liquid by using an organic solvent, washing with water, drying, and evaporating to remove the solvent to obtain liquid 2-hydroxy-5-methoxybenzaldehyde, and then by using toluene as a solvent, and enabling the obtained 2-hydroxy-5-methoxybenzaldehyde to be subjected to a demethylation reaction under the action of anhydrous aluminum trichloride to obtain 2, 5-dihydroxy benzaldehyde; and reacting for 2-4 hours, washing the reaction liquid with water, extracting with an organic solvent, drying, evaporating to remove the solvent, and crystallizing the solvent. The method has the advantages of cheap and easily available raw materials, simple operation and convenient industrial production.
Bisketene Equivalents as Diels-Alder Dienes
Dissanayake, Isuru,Hart, Jacob D.,Becroft, Emma C.,Sumby, Christopher J.,Newton, Christopher G.
supporting information, p. 13328 - 13333 (2020/09/03)
2,5-Bis(tert-butyldimethylsilyloxy)furans are established as vicinal bisketene equivalents for application as dienes in the Diels-Alder reaction. Cycloaddition with olefinic dienophiles, under exceptionally mild conditions, enables convergent access to highly substituted para-hydroquinones in unprotected form via a one-pot Diels-Alder/ring-opening/tautomerization sequence. The synthesis of para-benzoquinones from acetylenic dienophiles, including benzynes, is also demonstrated, and 2,5-bis(tert-butyldimethylsilyloxy)pyrroles are established as competent dienes for the synthesis of para-iminoquinones. Application in natural product synthesis enables gram-scale access to the neuroprotective agent (±)-indanostatin.
METHOD FOR PRODUCING ESTER GROUP-CONTAINING COMPOUND
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Paragraph 0131, (2019/03/08)
The present invention provides a novel method for producing an ester group-containing compound and a derivative produced using the compound as a synthetic intermediate. The invention also provides a polymerizable composition containing the compound obtained by the production method and a film-shaped polymer obtained by polymerizing the polymerizable composition. The present invention is a method for producing an ester group-containing compound, the method including a mixing step of mixing a condensing agent, a Bronsted acid, a carboxylic acid, and a phenol or an alcohol to prepare a reaction mixture. The Bronsted acid selected is other than the condensing agent, the carboxylic acid, and the phenol.