2,3-Dihydrobenzo[b]furan-5-carbaldehyde Chemical Properties

Melting point:

191～193℃

Boiling point:

88-89 °C/0.1 mmHg (lit.)

Density 

1.177 g/mL at 25 °C (lit.)

refractive index 

n20/D 1.6000(lit.)

Flash point:

>230 °F

storage temp. 

2-8°C(protect from light)

form 

clear liquid

color 

Colorless to Light orange to Yellow

CAS DataBase Reference

55745-70-5(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

43

Safety Statements 

37/39

WGK Germany 

3

HazardClass 

IRRITANT

HS Code 

29329990

MSDS

• Language:English Provider:SigmaAldrich

2,3-Dihydrobenzo[b]furan-5-carbaldehyde Usage And Synthesis

Chemical Properties

White to light yellow liquid

Uses

Hair dye composition.

Synthesis

2,3-Dihydrobenzofuran-5-carbaldehyde was synthesized as follows: in a dry reaction flask, 2,3-dihydrobenzofuran (100 g, 0.833 mol) was dissolved in N,N-dimethylformamide (355.0 ml). Under stirring, phosphorus oxychloride (255.58 g, 1.666 mol) was slowly added dropwise, and the reaction temperature was controlled to be maintained between 80°C and 85°C. The reaction mixture was stirred continuously at this temperature for 4 to 5 hours, during which the progress of the reaction was monitored by high performance liquid chromatography (HPLC). Upon completion of the reaction, the mixture was carefully poured into ice water to quench the reaction. Subsequently, the organic layer was separated by extraction with toluene (2000 ml). The organic layer was washed sequentially with 5% sodium bicarbonate solution (500 ml) and 10% brine solution (500 ml) to remove residual acid and DMF.The washed organic layer was subjected to distillation under reduced pressure at 50 °C to 60 °C to remove the solvent to give the crude product. By further purification, 2,3-dihydrobenzofuran-5-carbaldehyde was obtained in 85% to 90% yield and 90% to 92% purity.

References

[1] Patent: EP1792899, 2007, A1. Location in patent: Page/Page column 11
[2] Patent: WO2010/41271, 2010, A2. Location in patent: Page/Page column 28
[3] Letters in Drug Design and Discovery, 2013, vol. 10, # 7, p. 561 - 571
[4] Patent: CN102766135, 2017, B. Location in patent: Paragraph 0035-0036
[5] Journal of Medicinal Chemistry, 2002, vol. 45, # 19, p. 4222 - 4239

2,3-Dihydrobenzo[b]furan-5-carbaldehyde(55745-70-5)Related Product Information

• Furfural
• o-Phthalaldehyde
• m-Phthalaldehyde
• 2,3-Dihydrobenzofuran
• Terephthalaldehyde
• Furan
• Benzofuran
• 3-(2,3-DIHYDRO-BENZOFURAN-5-YL)-PROPIONIC ACID ETHYL ESTER
• 4-bromo-1,2,6,7-tetrahydro-8H-Indeno[5,4-b]furan-8-one
• WBYZCPYZHMZPHD-UHFFFAOYSA-N
• Ethyl 3-(2,3-Dihydrobenzofuran-5-yl)propenoate
• 2H-Indeno[5,4-b]furan-8-ethanamine, 1,6,7,8-tetrahydro-, (8R)-
• Rotenone
• 5-ACETYL-2,3-DIHYDROBENZO(B)FURAN
• Rifalazil
• 2,3-Dihydrobenzo[b]furan-5-carboxylic acid
• 5-BROMO-2,3-DIHYDROBENZO[B]FURAN-7-CARBALDEHYDE
• Rifabutin