209-08-5

Basic information

• Product Name: Furo[4,3,2-de][1]benzopyran (8CI,9CI)
• Synonyms: Furo[4,3,2-de][1]benzopyran (8CI,9CI)
• CAS NO: 209-08-5
• Molecular Formula: C10H6O2
• Molecular Weight: 158.15
• Mol File: 209-08-5.mol
• Article Data: 1

Chemical Properties

• Melting Point: 56-57 °C(Solv: ethanol (64-17-5))
• Boiling Point: 264.9±19.0 °C(Predicted)
• Appearance: /
• Density: 1.320±0.06 g/cm3(Predicted)
• CAS DataBase Reference: Furo[4,3,2-de][1]benzopyran (8CI,9CI)(CAS DataBase Reference)
• NIST Chemistry Reference: Furo[4,3,2-de][1]benzopyran (8CI,9CI)(209-08-5)
• EPA Substance Registry System: Furo[4,3,2-de][1]benzopyran (8CI,9CI)(209-08-5)

Safety Data

• Hazardous Substances Data: 209-08-5(Hazardous Substances Data)

Upstream product

• 133992-45-7 3-bromo-3,4-dihydrofuro<4,3,2-de><1>benzopyran 

Downstream Products

• 133992-43-5 3,4-dihydrofuro<4,3,2-de><1>benzopyran 
• 133992-48-0 3-ethyl-4-hydroxybenzofuran 

Relevant articles and documents

Synthesis and Properties of Furobenzopyran

A new heterocycle, furobenzopyran (2) was synthesized.A key step in the sequence was the allylic bromination of 3,4-dihydrofurobenzopyran (8) to give 3-bromo-3,4-dihydrofurobenzopyran (10) using N-bromosuccinimide under irradiation and high dilution conditions.Bromide 10 was dealt with 1,8-diazabicycloundec-7-ene to afford compound 2.Several reactions of 2 were examined.Protonation of 2 in trifluoroacetic acid occurred at the 2-position to form a pyrylium ion 12.Catalytic hydrogenation of 2 with palladium on charcoal proceeded smoothly to give 8.Reduction of 2 by sodium and ethanol afforded 3-ethyl-4-hydroxybenzofuran (14).Electrophilic substitutions of 2 such as formylation, acetylation, and bromination, occurred easily at the 2-position.The above results show that compound 2 has both properties of benzofuran and 4-methylenepyran.