Process for preparing benzo[1,2-b

Process for preparing benzo[1,2-b

The invention relates to a process for preparing benzo[1,2-b;4,5-b']dithiophene-4,8-dicarboxylic acid or its 2,3-dihydro derivative, and to novel products prepared by this process which comprises the following steps: A) heating benzo[1,2-b;4,5-b']dithiophene-4,4,8,8-tetracarboxylic acid, o...

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1. Verfasser: KRIEGBAUM EVA
Format: Patent
Sprache:chi ; eng
Schlagworte:
CHEMISTRY
HETEROCYCLIC COMPOUNDS
METALLURGY
ORGANIC CHEMISTRY
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Beschreibung
Zusammenfassung:The invention relates to a process for preparing benzo[1,2-b;4,5-b']dithiophene-4,8-dicarboxylic acid or its 2,3-dihydro derivative, and to novel products prepared by this process which comprises the following steps: A) heating benzo[1,2-b;4,5-b']dithiophene-4,4,8,8-tetracarboxylic acid, or an acid derivative thereof, in an organic solvent in the presence of a base and an oxidising agent, and adding an acid, to give benzo[1,2-b;4,5-b']dithiophene-4,8-dicarboxylic acid, or B) heating benzo[1,2-b;4,5-b']dithiophene-4,4,8,8-tetracarboxylic acid, or an acid derivative thereof, in a polar organic solvent in the presence of a base under exclusion of an oxidising agent, and adding an acid, to give 2,3-dihydrobenzo[1,2-b;4,5-b']dithiophene-4,8-dicarboxylic acid.