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Cas Database |
| Name |
2,5-Thiophenedicarboxylic acid |
EINECS | 224-284-2 |
| CAS No. | 4282-31-9 | Density | 1.655 g/cm3 |
| PSA | 102.84000 | LogP | 1.14450 |
| Solubility | Very soluble in water. | Melting Point |
>300 °C(lit.) |
| Formula | C6H4O4S | Boiling Point | 444.6 °C at 760 mmHg |
| Molecular Weight | 172.161 | Flash Point | 222.7 °C |
| Transport Information | N/A | Appearance | white to light yellow crystal powder |
| Safety | 26-36-37/39 | Risk Codes | 36/37/38 |
| Molecular Structure |
|
Hazard Symbols |
 Xi
|
| Synonyms |
2,5-Dicarboxythiophene;NSC 81789;Thiophene-2,5-dicarboxylic acid; |
Article Data | 42 |
2,5-Thiophenedicarboxylic acid Synthetic route
- 18853-40-2
2,5-thiophenedicarbonitrile
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
| Conditions | Yield |
|---|---|
| With hydrogenchloride for 6h; Heating; | 79% |
| Conditions | Yield |
|---|---|
| Stage #1: Adipic acid With dmap; thionyl chloride at 78 - 81℃; for 3.5h; Large scale; Stage #2: With sodium hydroxide In water at 70 - 72℃; for 2h; pH=9.3 - 10; Reagent/catalyst; Temperature; pH-value; Large scale; | 75.58% |
- 61755-85-9
2,5‐diethyl thiophene‐2,5‐dicarboxylate
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
| Conditions | Yield |
|---|---|
| With potassium hydroxide In ethanol for 2h; Heating; | 70% |
| With potassium hydroxide |
| Conditions | Yield |
|---|---|
| With n-butyllithium; carbon dioxide In tetrahydrofuran; water | 60% |
| With diethyl ether; phenyllithium Behandeln des Reaktionsgemisches mit festem Kohlendioxid; |
- 67-56-1
methanol
- 3141-27-3
2,5-dibromothiophen
- 201230-82-2
carbon monoxide
A
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
B
- 4282-34-2
Dimethyl thiophene-2,5-dicarboxylate
| Conditions | Yield |
|---|---|
| With tert-Amyl alcohol; sodium hydride; cobalt(II) acetate In tetrahydrofuran at 40℃; under 760 Torr; for 54h; Irradiation; | A 17% B 55% |
- 3141-27-3
2,5-dibromothiophen
- 201230-82-2
carbon monoxide
A
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
B
- 4282-34-2
Dimethyl thiophene-2,5-dicarboxylate
| Conditions | Yield |
|---|---|
| With methanol; tert-Amyl alcohol; sodium hydride; cobalt(II) acetate In tetrahydrofuran at 40℃; under 760 Torr; for 54h; Irradiation; | A 17% B 55% |
- 3141-27-3
2,5-dibromothiophen
- 124-38-9
carbon dioxide
A
- 7311-63-9
5-bromothiophene-2-carboxylic acid
B
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
| Conditions | Yield |
|---|---|
| Stage #1: 2,5-dibromothiophen; carbon dioxide With tert.-butyl lithium In pentane at -70℃; Inert atmosphere; Stage #2: With sulfuric acid; water In pentane at 20℃; Inert atmosphere; | A 34% B 5% |
- 188290-36-0
thiophene
- 1822-71-5
n-pentylsodium
- 14593-46-5
sodium tert-pentoxide
- 15719-64-9, 15719-76-3, 97762-63-5
methylammonium carbonate
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
| Conditions | Yield |
|---|---|
| aufeinanderfolgender Umsetzung; |
- 188290-36-0
thiophene
- 4282-31-9
Thiophene-2,5-dicarboxylic acid
| Conditions | Yield |
|---|---|
| With n-heptane; n-pentylsodium; sodium tert-pentoxide anschliessend Behandeln mit festem Kohlendioxid; |
| Conditions | Yield |
|---|---|
| With alkaline permanganate solution |
2,5-Thiophenedicarboxylic acid Chemical Properties
Empirical Formula: C6H4O4S
Molecular Weight: 172.1586
Index of Refraction: 1.662
Molar Refractivity: 38.49 cm3
Molar Volume: 103.9 cm3
Surface Tension: 83.9 dyne/cm
Density: 1.655 g/cm3
Flash Point: 222.7 °C
Enthalpy of Vaporization: 74.03 kJ/mol
Boiling Point: 444.6 °C at 760 mmHg
Vapour Pressure: 1.1E-08 mmHg at 25 °C
Melting point: >300 °C(lit.)
Appearance: White to light yellow crystal powder
Structure of 2,5-Thiophenedicarboxylic acid (CAS NO.4282-31-9):
Product Category of 2,5-Thiophenedicarboxylic acid (CAS NO.4282-31-9): Thiophenes;Thiophens;Functional Materials;Reagents for Conducting Polymer Research;Thiophene Derivatives (for Conduting Polymer Research);Thiophen;Heterocyclic Building Blocks
2,5-Thiophenedicarboxylic acid Safety Profile
Hazard Codes: 
Xi
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S36:Wear suitable protective clothing.
S37/39:Wear suitable gloves and eye/face protection.
2,5-Thiophenedicarboxylic acid Specification
2,5-Thiophenedicarboxylic acid , its cas register number is 4282-31-9. It also can be called Thiophene-2,5-dicarboxylic acid ; and NSC 81789 . It is hazardous, so the first aid measures and others should be known. Such as: When on the skin: first, should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly, get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While, it's inhaled: Remove from exposure and move to fresh air immediately. Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product: Wash mouth out with water, and get medical aid immediately. Notes to physician: Treat supportively and symptomatically.
In addition, 2,5-Thiophenedicarboxylic acid (CAS NO.4282-31-9) is not compatible with strong oxidizing agents, and you must not take it with incompatible materials. And also prevent it to broken down into hazardous decomposition products: Carbon monoxide, carbon dioxide, sulfur oxides (SOx), including sulfur oxide and sulfur dioxide.
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