| Identification | Back Directory | [Name]
2,5-Thiophenedicarboxaldehyde | [CAS]
932-95-6 | [Synonyms]
2,5-Thiophenedial
TIMTEC-BB SBB000080
2,5-Diformylthiophene
Thiophene-2,5-dialdehyde
THIOPHENE-2,5-DICARBALDEHYDE
2,5-THIOPHENEDICARBOXALDEHYDE
THIOPHENE-2,5-DICARBOXALDEHYDE
2,5-Thiophenedicarboxaldehyde,99%
2,5-Thiophenedicarboxaldehyde 99% | [Molecular Formula]
C6H4O2S | [MDL Number]
MFCD00216592 | [MOL File]
932-95-6.mol | [Molecular Weight]
140.16 |
| Chemical Properties | Back Directory | [Appearance]
PALE BROWN-ORANGE TO PALE BROWN POWDER | [Melting point ]
115-117 °C(lit.)
| [Boiling point ]
226.66°C (rough estimate) | [density ]
1.327 (estimate) | [refractive index ]
1.5300 (estimate) | [storage temp. ]
Keep in dark place,Inert atmosphere,2-8°C | [form ]
solid | [InChI]
InChI=1S/C6H4O2S/c7-3-5-1-2-6(4-8)9-5/h1-4H | [InChIKey]
OTMRXENQDSQACG-UHFFFAOYSA-N | [SMILES]
C1(C=O)SC(C=O)=CC=1 | [NIST Chemistry Reference]
2,5-Thiophenedicarboxaldehyde(932-95-6) |
| Hazard Information | Back Directory | [Chemical Properties]
PALE BROWN-ORANGE TO PALE BROWN POWDER | [Uses]
2,5-Thiophenedicarboxaldehyde acts as a reagent in the synthesis of N,N''-bis-(mercaptophenylimine)thiophenedicarboxaldehyde Schiff base, and also functions as an intermediate in many organic synthesis. | [Synthesis Reference(s)]
Synthesis, p. 316, 1988 DOI: 10.1055/s-1988-27553 | [General Description]
2,5-Thiophenedicarboxaldehyde can be prepared from 2,5-bis(chloromethyl)thiophene by the application of Kr?hnke′s method. | [Synthesis]
General method: n-Butyllithium solution (2.5 M hexane solution, 0.91 ml, 2.28 mmol, 1.1 eq.) was slowly added to a solution of 2,5-dibromothiophene (3a, 0.5 g, 2.07 mmol) in tetrahydrofuran (THF, 20 ml) under argon protection and at -78°C. The reaction mixture was slowly warmed to 0°C over 30 min. Subsequently, anhydrous N,N-dimethylformamide (DMF, 182 mg, 2.48 mmol, 1.2 eq.) was added and the reaction mixture was stirred at room temperature for 2 hours. Tert-butyl lithium solution (1.7 M pentane solution, 1.58 ml, 2.69 mmol, 1.3 eq.) was added again at -78 °C and the reaction mixture was stirred for 5 min. Next, an excess of anhydrous N,N-dimethylformamide (1 ml) was added and the reaction mixture was stirred overnight at room temperature. After completion of the reaction, the solution was poured into 1N hydrochloric acid (HCl, 10 ml) and stirred for 20 min. After neutralization with aqueous sodium bicarbonate (NaHCO3), the aqueous phase was extracted with dichloromethane (3 x 30 ml). The organic phases were combined, dried with anhydrous magnesium sulfate (MgSO4) and concentrated under reduced pressure to remove the solvent. The crude product was purified by silica gel column chromatography (eluent: hexane-ethyl acetate, 6:1) to afford 2,5-thiophenedicarboxaldehyde (8a, 123 mg, 42% yield) as a yellow amorphous solid. | [References]
[1] Chemistry of Materials, 2014, vol. 26, # 24, p. 7229 - 7235
[2] Tetrahedron Letters, 2013, vol. 54, # 22, p. 2795 - 2798
[3] Organic Letters, 2012, vol. 14, # 1, p. 78 - 81
[4] Journal of the American Chemical Society, 1995, vol. 117, # 9, p. 2467 - 2478 |
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