摘要:
A process for preparing 3,5-bisalkylphenols (2) from carbinol compounds (1); carbinol compounds (1); and a process for preparation of the compounds (1): (1) (2) [wherein R is hydrogen, alkali metal, alkaline earth metal, or a hydroxyl-protecting group(except methyl); R is C1-5 lower alkyl or optionally substituted phenyl; and R and R are each independently lower alkyl, aralkyl, or aryl]. This invention enables efficient and safe preparation of various 3,5-bisalkylphenols including 3,5-diisopropylphenol (which is important as an intermediate in the synthesis of drugs and agricultural chemicals) in shorter steps at high purity in high yield, thus contributing to stable supply of the drugs and agricultural chemicals.
摘要:
The present invention provides a simple and efficient method for producing high-purity 2,3,6,7,10,11-hexahydroxytriphenylene on an industrial scale. The method for producing 2,3,6,7,10,11-hexahydroxytriphenylene comprises reacting catechol with peroxide.
摘要:
A process for production of dimers of aromatic monohydroxyl compounds, characterized by conducting the oxidative coupling of an aromatic compound represented by the general formula [I]: Ar-OH [I] (wherein Ar is an optionally substituted aromatic group) in the presence of a copper salt in a nitrogenous polar solvent. According to this process, dimers of aromatic monohydroxyl compounds can be produced in high yield.
摘要:
A method for continuously producing 3,3',5,5'-tetra-t-butyl-4,4'-biphenol by oxidizing/dimerizing 2,6-di-t-butylphenol, comprising the steps of: supplying 2,6-di-t-butylphenol to a first reaction section of a reaction apparatus in which at least the first reaction section and a second reaction section are connected in series; supplying alkali catalyst to at least said first reaction section; and distributing oxygen-containing gas to each reaction section, respectively; whereby a reaction mixture containing 3,3',5,5'-tetra-t-butyl-4,4'-biphenol is obtained from a last reaction section.
摘要:
Est décrit un procédé permettant la préparation de phénylhydroquinones par l'alkylation d'hydroquinone (ou de ses dérivés) avec les parties de cyclohexyle, le cyclohexanol ou le cyclohexène (ou leurs dérivés), suivie de la déshydrogénation du cyclohexylhydroquinone intermédiaire.
摘要:
4,4'-Dihydroxydiphenyls are produced by oxidizing alkylphenols in an aqueous solution having a pH 7 to 12 and containing a surfactant, a copper compound, and a basic boron compound or a mixture of a basic substance and a boron compound. The desired 4,4'-dihydroxydiphenyls is easily obtained in high yield and without employment of special apparatus.
摘要:
2,6-Dialkylphenols may be oxidized in a molten state with an activated basic cupric oxide having a specific surface area to produce carbon-carbon coupled condensation products.
摘要:
Die Erfindung befasst sich mit der Herstellung von 2,2'-Biarylen, insbesondere von 2,2'-Biphenolen. Als Ausgangssubstanzen werden wahlweise zwei Aryle bzw. zwei Phenole oder ein 2,2'-Selenobiarylether verwendet. Alle Reaktionen werden in Gegenwart von Molybdän(V)-chlorid durchgeführt.