Procedure for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters

Reaction of 3,4-dihydroxythiophene-2,5-dicarboxylic esters with alkylating agents in a polar diluent is effected in presence of a quaternary onium salt. Also claimed is the novel compound 3,4-ethylenedioxythiophene-2,5-dicarboxylic acid monohydrate. Reaction of 3,4-dihydroxythiophene-2,5-dicarboxyli...

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Hauptverfasser:	KLAUSENER, ALEXANDER DR, WINKLER, ADOLF DR, SCHENKEL, RALFO DR, BREMEN, JOSEF DR, RAUCHSCHWALBE, GUENTER DR
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY
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creator	KLAUSENER, ALEXANDER DR WINKLER, ADOLF DR SCHENKEL, RALFO DR BREMEN, JOSEF DR RAUCHSCHWALBE, GUENTER DR
description	Reaction of 3,4-dihydroxythiophene-2,5-dicarboxylic esters with alkylating agents in a polar diluent is effected in presence of a quaternary onium salt. Also claimed is the novel compound 3,4-ethylenedioxythiophene-2,5-dicarboxylic acid monohydrate. Reaction of 3,4-dihydroxythiophene-2,5-dicarboxylic esters of formula (I) with alkylating agents in a polar diluent is effected in presence of a quaternary onium salt of formula (II) R and R = H or alkali(ne earth) metal; R and R = 1-10C alkyl; A = nitrogen or phosphorus; Y = an anion; and R - R = 1-20C alkyl, 6-15C aryl or 7-20C aralkyl An Independent claim is also included for the novel compound 3,4-ethylenedioxythiophene-2,5-dicarboxylic acid monohydrate.
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Reaction of 3,4-dihydroxythiophene-2,5-dicarboxylic esters of formula (I) with alkylating agents in a polar diluent is effected in presence of a quaternary onium salt of formula (II) R and R = H or alkali(ne earth) metal; R and R = 1-10C alkyl; A = nitrogen or phosphorus; Y = an anion; and R - R = 1-20C alkyl, 6-15C aryl or 7-20C aralkyl An Independent claim is also included for the novel compound 3,4-ethylenedioxythiophene-2,5-dicarboxylic acid monohydrate.</description><edition>7</edition><language>eng ; fre ; ger</language><subject>APPARATUS THEREFOR ; CHEMISTRY ; GENERAL METHODS OF ORGANIC CHEMISTRY ; HETEROCYCLIC COMPOUNDS ; METALLURGY ; ORGANIC CHEMISTRY</subject><creationdate>2005</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20050119&DB=EPODOC&CC=EP&NR=1298133B1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,780,885,25564,76547</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20050119&DB=EPODOC&CC=EP&NR=1298133B1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>KLAUSENER, ALEXANDER DR</creatorcontrib><creatorcontrib>WINKLER, ADOLF DR</creatorcontrib><creatorcontrib>SCHENKEL, RALFO DR</creatorcontrib><creatorcontrib>BREMEN, JOSEF DR</creatorcontrib><creatorcontrib>RAUCHSCHWALBE, GUENTER DR</creatorcontrib><title>Procedure for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters</title><description>Reaction of 3,4-dihydroxythiophene-2,5-dicarboxylic esters with alkylating agents in a polar diluent is effected in presence of a quaternary onium salt. 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subjects	APPARATUS THEREFOR CHEMISTRY GENERAL METHODS OF ORGANIC CHEMISTRY HETEROCYCLIC COMPOUNDS METALLURGY ORGANIC CHEMISTRY
title	Procedure for the alkylation of 3,4-dihydroxythiophene-2,5-dicarboxylic esters
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