669-40-9

Basic information

• Product Name: 6-Methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester
• Synonyms: 6-Methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester;Methyl 6-Methyl-2-Methylene-2H-pyran-5-carboxylate;Methyl 6-methyl-2-pyrone-5-carboxylate;Methyl 6-methyl-2-oxo-2H-pyran-5-carboxylate
• CAS NO: 669-40-9
• Molecular Formula: C₈H₈O₄
• Molecular Weight: 168.15
• Mol File: 669-40-9.mol
• Article Data: 3

Chemical Properties

• Melting Point: 81-82℃
• Boiling Point: 272.9±15.0 °C(Predicted)
• Appearance: /
• Density: 1.253±0.06 g/cm3(Predicted)
• CAS DataBase Reference: 6-Methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester(CAS DataBase Reference)
• NIST Chemistry Reference: 6-Methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester(669-40-9)
• EPA Substance Registry System: 6-Methyl-2-oxo-2H-pyran-5-carboxylic acid methyl ester(669-40-9)

Safety Data

• Hazardous Substances Data: 669-40-9(Hazardous Substances Data)

Upstream product

• 186581-53-3 diazomethane 
• 67-56-1 methanol 
• 6018-41-3 methyl coumalate 
• 60-29-7 diethyl ether 
• 2648-51-3 3,3-dichloroacrolein 
• 105-45-3 acetoacetic acid methyl ester 
• 10601-80-6 ethyl 3,3-diethoxypropanoate 
• 623-47-2 propynoic acid ethyl ester 

Downstream Products

• 25683-10-7 6-methyl-2-oxo-2H-pyran-5-carboxylic acid 
• 116934-87-3 2-methylbenzene-1,4-dicarboxylic acid 1-methyl ester 
• 34669-95-9 methyl-benzene-1,3,5-tricarboxylic acid trimethyl ester 
• 112158-10-8 Dimethyl-xanthophanenol 

Relevant articles and documents

DABCO-catalyzed C-C bond formation reaction between electron-deficient alkynes and 1,3-dicarbonyl compounds

An excellent catalyst DABCO has been found to catalyze C-C bond formation reaction between activated methylenes and alkynes. The transformation has provided a facile route for the synthesis of 2H-pyran-2-ones or unsaturated alkenoic acid ester derivatives

Electron-Deficient Glutaconate Systems: the Formation of Lactones, Benzenes and Naphthalenes

Base catalysed glutaconate-pyrone systems involved in the formation of xanthyrones and glaucyrones also produce benzenoid and naphthalenoid compounds dependent on the system and conditions involved. "Dimer" type condensations usually require milder base than the "monomeric" type and three base-catalysed cases are encountered involving: (a) two aldol and one Claisen condensations; (b) three aldols; and (c) Michael addition and lactonisation.An example of Lewis acid catalysed formation of a coumarin from dimethyl 2,4-dimethoxycarbonyl glutaconic ester is also given.Arationale is suggested for the formation of trimethyl methyltrimesate in a "melt" reaction, and of the products from the treatment of certain xanthyrones with sodium methoxide.