133992-43-5

Basic information

• Product Name: Furo[4,3,2-de][1]benzopyran, 3,4-dihydro-
• Synonyms: Furo[4,3,2-de][1]benzopyran, 3,4-dihydro-
• CAS NO: 133992-43-5
• Molecular Formula: C10H8O2
• Molecular Weight: 160.17
• Mol File: 133992-43-5.mol
• Article Data: 1

Chemical Properties

• Appearance: /
• CAS DataBase Reference: Furo[4,3,2-de][1]benzopyran, 3,4-dihydro-(CAS DataBase Reference)
• NIST Chemistry Reference: Furo[4,3,2-de][1]benzopyran, 3,4-dihydro-(133992-43-5)
• EPA Substance Registry System: Furo[4,3,2-de][1]benzopyran, 3,4-dihydro-(133992-43-5)

Safety Data

• Hazardous Substances Data: 133992-43-5(Hazardous Substances Data)

Upstream product

• 906633-72-5 (4-Oxo-chroman-5-yloxy)-acetic acid ethyl ester 
• 133992-45-7 3-bromo-3,4-dihydrofuro<4,3,2-de><1>benzopyran 
• 13849-19-9 5-hydroxy-3,4-dihydro-2H-1-benzopyran-4-one 
• 3952-69-0 5-hydroxy-4H-1-benzopyran-4-one 
• 133992-42-4 4-oxo-3,4-dihydro-2H-1-benzopyran-5-yloxyacetic acid 
• 209-08-5 furo<4,3,2-de><1>benzopyran 
• 127-09-3 sodium acetate 

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.