Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Reexamination Certificate
2007-04-10
2007-04-10
Shameem, Golam M. M. (Department: 1626)
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
C549S029000, C549S049000
Reexamination Certificate
active
10715845
ABSTRACT:
The present invention relates to a process for preparing 3,4-dialkoxythiophenes or 3,4-alkylenedioxythiophenes in high yield via the rapid decarboxylation of 3,4-dialkoxythiophenedicarboxylic acid or 3,4-aklylenedioxythiophenedicarboxylic acid in a water-miscible polar solvent in the presence of copper catalyst under an oxygen atmosphere.
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patent: 2453103 (1948-11-01), Turnbull, Jr.
patent: 6369239 (2002-04-01), Rauchschwalbe et al.
patent: 6528662 (2003-03-01), Jonas
patent: 6750354 (2004-06-01), Rauchschwalbe et al.
Baik Woon-Phil
Hong Hee-Jung
Jung Sang-Gook
Kim Young-Sam
Baik Woon-Phil
Nixon & Vanderhye P.C.
Shameem Golam M. M.
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