1,3-Cyclopentanedione

1,3-Cyclopentanedione is an organic compound with the formula (CH₂)₃(CO)₂. It is one of two isomeric cyclopentanediones, the other being 1,2-cyclopentanedione. The enol is predicted to be about 1-3 kcal/mol more stable than the diketo form.^[1] The enol structure has been confirmed by X-ray crystallography.^[2]

Quick facts Names, Identifiers ...

1,3-Cyclopentanedione

Names
Preferred IUPAC name Cyclopentane-1,3-dione
Identifiers
CAS Number	3859-41-4
3D model (JSmol)	Interactive image
Beilstein Reference	1362728
ChEBI	CHEBI:41456
ChEMBL	ChEMBL224233
ChemSpider	69875
ECHA InfoCard	100.021.249
EC Number	223-372-8
Gmelin Reference	200797
PubChem CID	77466
UNII	98107S5K06
CompTox Dashboard (EPA)	DTXSID90191911
InChI InChI=1S/C5H6O2/c6-4-1-2-5(7)3-4/h1-3H2 Key: LOGSONSNCYTHPS-UHFFFAOYSA-N
SMILES C1CC(=O)CC1=O
Properties
Appearance	white solid
Density	1.37 g/cm3
Melting point	149–151 Â°C (300–304 Â°F; 422–424 K)
Hazards
GHS labelling:
Pictograms
Signal word	Warning
Hazard statements	H315, H319, H335
Precautionary statements	P261, P264, P271, P280, P302+P352, P304+P340, P305+P351+P338, P312, P321, P332+P313, P337+P313, P362, P403+P233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 Â°C [77 Â°F], 100 kPa). Infobox references

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