28424-70-6

Basic information

• Product Name: 4,5-Dihydro-thieno[2,3-o]pyran-7,-one
• Synonyms: 4,5-Dihydro-thieno[2,3-o]pyran-7,-one;4H-thieno[2,3-c]pyran-7(5H)-one
• CAS NO: 28424-70-6
• Molecular Formula: C7H6O2S
• Molecular Weight: 154.18634
• Mol File: 28424-70-6.mol
• Article Data: 7

Chemical Properties

• Melting Point: 53-54 °C(Solv: carbon tetrachloride (56-23-5))
• Boiling Point: 342.8±37.0 °C(Predicted)
• Appearance: /
• Density: 1.361±0.06 g/cm3(Predicted)
• CAS DataBase Reference: 4,5-Dihydro-thieno[2,3-o]pyran-7,-one(CAS DataBase Reference)
• NIST Chemistry Reference: 4,5-Dihydro-thieno[2,3-o]pyran-7,-one(28424-70-6)
• EPA Substance Registry System: 4,5-Dihydro-thieno[2,3-o]pyran-7,-one(28424-70-6)

Safety Data

• Hazardous Substances Data: 28424-70-6(Hazardous Substances Data)

Upstream product

• 13781-67-4 3-(2-hydroxyethyl)thiophene 
• 6964-21-2 thiophen-3-yl-acetic acid 
• 1448259-32-2 5,4-dihydro-4H-thieno[2,3-c]pyran 
• 960400-24-2 C₇H₇ClO₂S 

Downstream Products

• 960400-26-4 3-iodo-4,5-dihydro-thieno[2,3-c]pyran-7-one 
• 960400-28-6 2-iodo-4,5-dihydro-thieno[2,3-c]pyran-7-one 
• 960400-44-6 3-(2-hydroxy-ethyl)-5-iodo-thiophene-2-carboxylic acid [3-methoxy-4-(2-pyrrolidin-1-yl-ethoxy)-phenyl]-amide 
• 960400-50-4 2-iodo-6-[3-methoxy-4-(2-pyrrolidin-1-yl-ethoxy)-phenyl]-5,6-dihydro-4H-thieno[2,3-c]pyridin-7-one 

Relevant articles and documents

α-Angelica lactone catalyzed oxidation of benzylic sp3C-H bonds of isochromans and phthalans

A metal-free organocatalytic system has been developed for highly efficient benzylic C-H oxygenations of cyclic ethers using oxygen as an oxidant. This oxidation reaction utilizes α-angelica lactone as a low cost/low molecular weight catalyst. The optimized reaction conditions allow the synthesis of valued isocoumarins and phthalides from readily available precursors in good yields. Mechanistic studies indicate that the reaction pathway likely involves a radical processviaa peroxide intermediate.

A g-C3N4-based heterogeneous photocatalyst for visible light mediated aerobic benzylic C-H oxygenations

A metal-free heterogeneous photocatalytic system has been developed for highly efficient benzylic C-H oxygenations using oxygen as an oxidant. This visible light mediated oxidation reaction utilizes graphitic carbon nitride (g-C3N4) as a recyclable, nontoxic and low cost photocatalyst. Mild reaction conditions allow for the generation of synthetically and biologically valued isochromannones, phthalides, isoquinolinones, isoindolinones and xanthones from readily accessible alkyl aromatic precursors in good yields. The heterogeneous nature of the g-C3N4 catalytic system enables easy recovery and recycling as well as the use in multiple runs without loss of activity. The synthetic utility of this "green" methodology was further demonstrated by applying in bioactive and drug valued target syntheses.

Organocatalytic Aerobic Oxidation of Benzylic sp3 C-H Bonds of Ethers and Alkylarenes Promoted by a Recyclable TEMPO Catalyst

An entirely metal-free catalyst system consisting of an easily prepared recyclable new TEMPO derived sulfonic salt catalyst, and mineral acids (NaNO2 and HCl) has been developed for selective aerobic oxidation of structurally diverse benzylic sp3 C-H bonds of ethers and alkylarenes. The mild reaction conditions allow for the generation of synthetically and biologically valued isochromanones and xanthones from readily accessible alkyl aromatic precursors in good yields.