73761-48-5

Basic information

• Product Name: 4H-Pyran-4-one,2,3-dimethyl-(9CI)
• Synonyms: 4H-Pyran-4-one,2,3-dimethyl-(9CI)
• CAS NO: 73761-48-5
• Molecular Formula: C₇H₈O₂
• Molecular Weight: 124.13722
• Product Categories: PYRANONE
• Mol File: 73761-48-5.mol
• Article Data: 1

Chemical Properties

• Appearance: /
• CAS DataBase Reference: 4H-Pyran-4-one,2,3-dimethyl-(9CI)(CAS DataBase Reference)
• NIST Chemistry Reference: 4H-Pyran-4-one,2,3-dimethyl-(9CI)(73761-48-5)
• EPA Substance Registry System: 4H-Pyran-4-one,2,3-dimethyl-(9CI)(73761-48-5)

Safety Data

• Hazardous Substances Data: 73761-48-5(Hazardous Substances Data)

Upstream product

• 92490-75-0 5,6-dimethyl-4-oxo-4H-pyran-2-carboxylic acid 

Downstream Products

• 1193-79-9 2-acetyl-5-methylfuran 
• 62968-83-6 3,4-dimethyl-2-pyrone 
• 4209-44-3 5,6-dimethyl-2-pyrone 

Relevant articles and documents

Photoisomerization of 4-Hydroxypyrylium Cations in Concentrated Sulfuric Acid

Irradiation of di-, tri-, and tetraalkyl-4-hydroxypyrylium cations in concentrated sulfuric acid leads to the formation of 2-hydroxypyrylium cations as phototransposition products and, in certain cases, to furyl cations by a photo-ring-contraction reaction.Product analysis by spectroscopic techniques, deuterium labeling, and unambiguous synthesis reveals that 2-hydroxypyrylium cations are formed by two distinct transposition patterns and accordingly, by two distinct mechanistic pathways.The bond-forming and -breaking requirements of the major transposition pattern, which constitutes approximately 95percent of the reaction, are consistent with a mechanism initiated by 2,6-bridging in the first excited state of the 4-hydroxypyrylium cation.Similarly, the bond-formation and -breaking requirements of the minor pattern are consistent with a mechanism involving 2,5-bridging in the first excited state of the starting cation.