1,3-CYCLOPENTANEDIONE

PRODUCT IDENTIFICATION
CAS NO. 3859-41-4

1,3-CYCLOPENTANEDIONE

EINECS NO. 223-372-8
FORMULA C5H6(=O)2
MOL WT. 98.10
H.S. CODE  

TOXICITY

  
SYNONYMS Cyclopentane-1,3-dione; 1,3-Cyclopentadione;
3-Hydroxy-2-cyclopenten-1-one;

SMILES

 

CLASSIFICATION

DIKETONES /

PHYSICAL AND CHEMICAL PROPERTIES
PHYSICAL STATE white to off-white crystalline powder
MELTING POINT 147 - 151 C
BOILING POINT

 

SPECIFIC GRAVITY  
SOLUBILITY IN WATER  
pH

 

VAPOR DENSITY  

AUTOIGNITION

 

NFPA RATINGS

  

REFRACTIVE INDEX

 

FLASH POINT

 

STABILITY

Stable under ordinary conditions

APPLICATIONS
1,3-Cyclopentanedione is a cyclic 1,3-diketone which two ketones are separated only by one carbon. The beta-ketone is stable as a conjugated enol rather than alpha-diketone due to the delocalization which makes the counter ion more stable and less likely to regain the proton. 1,3-Diketone and its esters contain active methylene groups which have relatively acidic alpha-protons due to H atom adjacent to two carbonyl groups. The reactivity of its methylene group provide the sequence of reactions of alkylation, hydrolysis of the esters and decarboxylation resulting in substituted ketones. The methylene group can be reacted to form amino-carbonyl compounds. 1,3-Diketone compounds (beta-ketones) include malonic acid, diethyl malonate, Meldrum's acid, and acetoacetic acid derivatives.

1,3-Cyclopentanedione is a versatile reagent for synthesis of perhydroazulenes, prostaglandin products (biologically active unsaturated 20-carbon fatty acids including a 5-carbon ring, derived enzymatically ), and Knoevenagel products.

SALES SPECIFICATION

APPEARANCE

white to off-white crystalline powder
PURITY

98.0% min

MELTING POINT 147 - 151 C
TRANSPORTATION
PACKING  
HAZARD CLASS  
UN NO.  
OTHER INFORMATION
Hazard Symbols: , Risk Phrases: , Safety Phrases: 22-24/25