An object of the present invention is to provide a process that enables isocyanates to be stably produced over a long period of time at high yield without encountering various problems as found in the prior art when producing isocyanates without using phosgene. The present invention discloses a process for producing an isocyanate, comprising the steps of: reacting a carbamic acid ester and an aromatic hydroxy compound to obtain an aryl carbamate having a group derived from the aromatic hydroxy compound; and subjecting the aryl carbamate to a decomposition reaction, wherein the aromatic hydroxy compound is an aromatic hydroxy compound which is represented by the following formula (1) and which has a substituent R
1
at least one ortho position of a hydroxyl group:
(wherein ring A represents an aromatic hydrocarbon ring in a form of a single or multiple rings which may have a substitute and which have 6 to 20 carbon atoms;
R
1
represents a group other than a hydrogen atom in a form of an aliphatic alkyl group having 1 to 20 carbon atoms, an aliphatic alkoxy group having 1 to 20 carbon atoms, an aryl group having 6 to 20 carbon atoms, an aryloxy group having 6 to 20 carbon atoms, an aralkyl group having 7 to 20 carbon atoms or an aralkyloxy group having 7 to 20 carbon atoms, the group containing an atom selected from a carbon atom, an oxygen atom and a nitrogen atom; and R
1
may bond with A to form a ring structure).
ISOCYANATE PRODUCTION PROCESS USING COMPOSITION CONTAINING CARBAMIC ACID ESTER AND AROMATIC HYDROXY COMPOUND, AND COMPOSITION FOR TRANSFER AND STORAGE OF CARBAMIC ACID ESTER
申请人:Shinohata Masaaki
公开号:US20100113823A1
公开(公告)日:2010-05-06
An object of the present invention is to provide an isocyanate production process, which is free of the various problems found in the prior art, and which uses a composition containing a carbamic acid ester and an aromatic hydroxy compound when producing isocyanate without using phosgene, as well as a carbamic acid ester composition for transferring or storing carbamic acid ester. The present invention discloses an isocyanate production process including specific steps and using a composition containing a carbamic acid ester and an aromatic hydroxy compound, as well as a composition for transfer or storage of carbamic acid ester comprising the carbamic acid ester and the specific aromatic hydroxy compound.
Isocyanate Production Process Using Composition Containing Carbamic Acid Ester and Aromatic Hydroxy Compound, and Composition for Transfer and Storage of Carbamic Acid Ester
申请人:Asahi Kasei Chemicals Corporation
公开号:US20150259279A1
公开(公告)日:2015-09-17
An object of the present invention is to provide an isocyanate production process, which is free of the various problems found in the prior art, and which uses a composition containing a carbamic acid ester and an aromatic hydroxy compound when producing isocyanate without using phosgene, as well as a carbamic acid ester composition for transferring or storing carbamic acid ester. The present invention discloses an isocyanate production process including specific steps and using a composition containing a carbamic acid ester and an aromatic hydroxy compound, as well as a composition for transfer or storage of carbamic acid ester comprising the carbamic acid ester and the specific aromatic hydroxy compound.
meta-Selective C–H arylation of phenols via regiodiversion of electrophilic aromatic substitution
作者:Aaron Senior、Katie Ruffell、Liam T. Ball
DOI:10.1038/s41557-022-01101-0
日期:2023.3
Electrophilic aromatic substitution is among the most widely used mechanistic manifolds in organic chemistry. Access to certain substitution patterns is, however, precluded by intrinsic and immutable substituent effects that ultimately restrict the diversity of the benzenoid chemical space. Here we demonstrate that the established regioselectivity of electrophilic aromatic substitution can be overcome
Verfahren zur Isomerisierung und Transalkylierung von alkylierten Phenolen und/oder Phenolderivaten
申请人:RWE-DEA Aktiengesellschaft für Mineraloel und Chemie
公开号:EP0119421A1
公开(公告)日:1984-09-26
Die Erfindung betrifft ein Verfahren zur Isomerisierung und Transalkylierung von alkylierten Phenolen und/oder Phenolderivaten in Gegenwart eines Katalysators, der Eisenoxid enthält und wenigstens ein weiteres Oxid und im Falle des 2,4,6-Trimethylphenols und 2,4-Dimethylphenol von Eisenoxid(en) oder eines Katalysators, der Eisenoxid enthält und wenigstens ein weiteres Oxid.