Title:
ALKYLATION METHOD OF 3,4-DIHYDROXYTHIOPHENE-2,5- DICARBOXYLIC ACID ESTER
Document Type and Number:
Japanese Patent JP2003128667
Kind Code:
A
Abstract:
To provide an alkylation method of 3,4-dihydroxythiophene-2,5- dicarboxylic acid ester or an alkali metal salt or an alkaline earth metal salt thereof, which is easy to carry out and with which corresponding 3,4- dialkoxythiophene-2,5-dicarboxylic acid ester and 3,4-alkylenedioxythiophene-2,5- dicarboxylic acid ester can be obtained in a high yield in a relatively short reaction period.
The alkylation method is characterized by that 3,4- dihydroxythiophene-2,5-dicarboxylic acid ester or an alkali metal salt or an alkaline earth metal salt thereof is alkylated in the presence of an organic onium salt.
Inventors:
RAUCHSCHWALBE GUNTER
KLAUSENER ALEXANDER
BREMEN JOSEF DIPL CHEM DR
SCHENKEL RALF-INGO
WINKLER ADOLF DIPL CHEM DR
KLAUSENER ALEXANDER
BREMEN JOSEF DIPL CHEM DR
SCHENKEL RALF-INGO
WINKLER ADOLF DIPL CHEM DR
Application Number:
JP2002285694A
Publication Date:
May 08, 2003
Filing Date:
September 30, 2002
Export Citation:
Assignee:
BAYER AG
International Classes:
C07B61/00; C07D333/38; C07D495/04; C07D497/04; (IPC1-7): C07D333/38; C07D495/04
Attorney, Agent or Firm:
Heiyoshi Odashima