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CAS No.: | 4282-31-9 |
---|---|
Name: | 2,5-Thiophenedicarboxylic acid |
Article Data: | 42 |
Molecular Structure: | |
Formula: | C6H4O4S |
Molecular Weight: | 172.161 |
Synonyms: | 2,5-Dicarboxythiophene;NSC 81789;Thiophene-2,5-dicarboxylic acid; |
EINECS: | 224-284-2 |
Density: | 1.655 g/cm3 |
Melting Point: | >300 °C(lit.) |
Boiling Point: | 444.6 °C at 760 mmHg |
Flash Point: | 222.7 °C |
Solubility: | Very soluble in water. |
Appearance: | white to light yellow crystal powder |
Hazard Symbols: | Xi |
Risk Codes: | 36/37/38 |
Safety: | 26-36-37/39 |
PSA: | 102.84000 |
LogP: | 1.14450 |
2,5-thiophenedicarbonitrile
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% |
2,5‐diethyl thiophene‐2,5‐dicarboxylate
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; |
methanol
2,5-dibromothiophen
carbon monoxide
A
Thiophene-2,5-dicarboxylic acid
B
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% |
2,5-dibromothiophen
carbon monoxide
A
Thiophene-2,5-dicarboxylic acid
B
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% |
2,5-dibromothiophen
carbon dioxide
A
5-bromothiophene-2-carboxylic acid
B
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% |
thiophene
n-pentylsodium
sodium tert-pentoxide
methylammonium carbonate
Thiophene-2,5-dicarboxylic acid
Conditions | Yield |
---|---|
aufeinanderfolgender Umsetzung; |
thiophene
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 |
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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
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 , 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.