| Identification | Back Directory | [Name]
THIOPHENE-3,4-DICARBOXYLIC ACID | [CAS]
4282-29-5 | [Synonyms]
3,4-Dicarboxythiophene
3,4-THIOPHENEDICARBOXYLIC ACID
THIOPHENE-3,4-DICARBOXYLIC ACID
3,4-Thiophenedicarboxylic acid,97%
3,4-Thiophenedicarboxylic acid ,98% | [Molecular Formula]
C6H4O4S | [MDL Number]
MFCD00067079 | [MOL File]
4282-29-5.mol | [Molecular Weight]
172.16 |
| Chemical Properties | Back Directory | [Appearance]
yellow to beige-pinkish or light brown crystalline | [Melting point ]
227-231 °C
| [Boiling point ]
272.46°C (rough estimate) | [density ]
1.473 (estimate) | [refractive index ]
1.5500 (estimate) | [storage temp. ]
Keep in dark place,Sealed in dry,Room Temperature | [solubility ]
soluble in Methanol | [form ]
Crystalline Powder | [pka]
3.36±0.20(Predicted) | [color ]
Yellow to beige-pinkish or light brown | [λmax]
240nm(H2O)(lit.) | [InChI]
InChI=1S/C6H4O4S/c7-5(8)3-1-11-2-4(3)6(9)10/h1-2H,(H,7,8)(H,9,10) | [InChIKey]
ZWWLLYJRPKYTDF-UHFFFAOYSA-N | [SMILES]
C1SC=C(C(O)=O)C=1C(O)=O |
| Hazard Information | Back Directory | [Chemical Properties]
yellow to beige-pinkish or light brown crystalline | [Uses]
Thiophene-3,4-dicarboxylic Acid is used in preparation of dibromo thienofuran dione. | [Synthesis]
Thiophene-3,4-dicarbonitrile (13.4 g, 100 mmol) and KOH (56.1 g, 1 mol) were dissolved in ethylene glycol (167 ml), and heated under stirring overnight. The solution was cooled, put into distilled water, and washed with diethyl ether. The aqueous layer was oxidized with saturated hydrochloric acid, and organic materials were extracted with ethyl acetate. The organic layer was dried over MgSO and the4, solvent was evaporated Then, recrystallization was performed in distilled water to obtain thiophene-3,4-dicarboxylic acid (15.2 g, 88percent). |
| Raw materials And Preparation Products | Back Directory | [Raw materials]
N,N-Dimethylformamide-->Ferric chloride-->Copper(I) Cyanide-->3,4-Dibromothiophene-->2-Butenedioic acid, 2,3-dimethyl-, dimethyl ester, (2Z)--->diethyl 2-(diethoxymethyl)butanedioate-->2-(Diethoxymethyl)-3-formylbutanedioic acid diethyl ester-->3,4-Diiodothiophene-->3,4-Thiophenedicarboxylic acid, diMethyl ester-->DIETHYL FORMYLSUCCINATE-->2,3-Dimethylmaleic anhydride-->3,4-DICYANOTHIOPHENE,-->3,4-Thiophenedicarboxylic acid, diethyl ester-->3,4-Thiophenedicarboxylic acid, 2,5-dihydro-, dimethyl ester-->Carbon dioxide | [Preparation Products]
1,3-Dibromo-5-octyl-4H-thieno[3,4-c]pyrrole-4,6(5H)-dione-->4-BROMOTHIOPHENE-3-CARBOXYLIC ACID |
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