3491-01-8

Basic information

• Product Name: Cyclopentanone, 2-carbonyl-
• CAS NO: 3491-01-8
• Molecular Formula: C6H6O2
• Molecular Weight: 110.112
• Mol File: 3491-01-8.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: Cyclopentanone, 2-carbonyl-(CAS DataBase Reference)
• NIST Chemistry Reference: Cyclopentanone, 2-carbonyl-(3491-01-8)
• EPA Substance Registry System: Cyclopentanone, 2-carbonyl-(3491-01-8)

Safety Data

• Hazardous Substances Data: 3491-01-8(Hazardous Substances Data)

Upstream product

• 32961-64-1 4,5,6,7-tetrahydrocyclopenta-1,3-dioxin-4-one 

Downstream Products

• 1830-92-8 methyl 2-oxocyclopentanecarboxylate 
• 10472-24-9 methyl 2-oxocyclopentane-1-carboxylate 

Relevant articles and documents

Direct Observation of α-Oxo Ketenes from the Photolysis of α-Diazo β-Diketones

Monitoring by IR spectroscopy of the broad-band irradiation of the symmetrically substituted 2-diazocyclohexane-1,3-dione (11), 3-diazopentane-2,4-dione (19), and 4-diazo-2,2,6,6-tetramethylheptane-3,5-dione (24) in Ar matrices at 12 K showed the formation of 2-carbonylcyclopentanone (s-Z-12), acetyl(methyl)ketene (s-E-20), and tert-butyl(pivaloyl)ketene (s-E-25), respectively, in less than 10 min.On increasing the photolysis time to >3 h, the α-oxo ketenes 12, 20, and 25 decarbonylated to the corresponding oxocarbenes which underwent Wolff rearrangement to carbonylcyclobutane (15), dimethylketene (23), and di-tert-butylketene (28), respectively.The reaction of 2-carbonylcyclopentanone (12) with CH3OH was monitored by IR spectroscopy.Thus, it was found that the reaction started at ca. 100 K and was essentially complete at 140 K, involving the initial formation of the enol form (9) of methyl 2-oxocyclopentanecarboxylate.