Thiophene-3,4-dicarboxylic acid → 1H,3H-Thieno[3,4-c]furan-1,3-dione
Reaction equation
[S:1]1[CH:5]=[C:4]([C:6]([OH:8])=O)[C:3]([C:9]([OH:11])=[O:10])=[CH:2]1>C(OC(=O)C)(=O)C>[S:1]1[CH:2]=[C:3]2[C:9]([O:11][C:6](=[O:8])[C:4]2=[CH:5]1)=[O:10]Participants
3
Reactant 1
Product 1
Reagents, catalysts & solvents 1
Procedure
Thiophene-3,4-dicarboxylic acid (12 g, 0.07 mol) is dissolved in acetic anhydride (60 ml) and boiled for 2.5 hours. The mixture is then concentrated to dryness. There is obtained 10.55 g (98%) of thiophene-3,4-dicarboxylic anhydride (m.p. 147°-149° C.).
Workup
- concentrationThe mixture is then concentrated to dryness
Sources & evidence
- ORD record
- ord-b073349783274fb6b45169435b736399
- Source dataset
- uspto-grants-1993_04
- Patent number
- US05201934
Reaction notes
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