http://rdf.ncbi.nlm.nih.gov/pubchem/patent/EP-0626361-A1

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filingDate 1994-05-13-04:00^^<http://www.w3.org/2001/XMLSchema#date>
inventor http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_63960fa10e361b4ff5268661e13a03b3
publicationDate 1994-11-30-04:00^^<http://www.w3.org/2001/XMLSchema#date>
publicationNumber EP-0626361-A1
titleOfInvention Process for the preparation of difluoromethoxy- and difluoromethylthioarenes
abstract Ar für gegebenenfalls substituiertes Aryl steht und Q für Sauerstoff oder Schwefel steht, (welche als Zwischenprodukte zur Herstellung von biologisch aktiven Produkten verwendet werden können) erhält man in sehr guten Ausbeuten und in hoher Reinheit, indem man Hydroxy- oder Mercaptoarene der allgemeinen Formel n n n n        Ar-Q-H   (II) n n n nmit Chlordifluormethan (ClCHF₂) in Gegenwart eines wäßrigen Alkalimetall- oder Erdalkalimetallhydroxids bei Temperaturen zwischen 20°C und 120°C umsetzt, nwobei die Umsetzung in Gegenwart eines Phasentransfer-Katalysators aus der Reihe der tetrasubstituierten Ammonium- und Phosphoniumsalze und in Gegenwart eines unpolaren oder mäßig polaren Lösungsmittels aus der Reihe der aliphatischen oder alicyclischen Kohlenwasserstoffe oder der Reihe der gegebenenfalls durch Chlor substituierten aromatischen Kohlenwasserstoffe oder der Reihe der verzweigten Alkylether durchgeführt wird.Difluoromethoxy- and difluoromethylthioarenes of the general formula (I), Ar-Q-CHF₂ (I) in which Ar represents optionally substituted aryl and Q represents oxygen or sulfur, (which can be used as intermediates for the production of biologically active products) can be obtained in very good yields and in high purity by using hydroxy- or mercaptoarenes of the general formula Ar-QH (II) with chlorodifluoromethane (ClCHF₂) in the presence of an aqueous alkali metal or alkaline earth metal hydroxide at temperatures between 20 ° C and 120 ° C, wherein the reaction in the presence of a phase transfer catalyst from the series of tetrasubstituted ammonium and phosphonium salts and in the presence of a non-polar or moderately polar solvent from the series of aliphatic or alicyclic hydrocarbons or the series of aromatic hydrocarbons optionally substituted by chlorine or the series of branched Alkyl ether is carried out.
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priorityDate 1993-05-25-04:00^^<http://www.w3.org/2001/XMLSchema#date>
type http://data.epo.org/linked-data/def/patent/Publication

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