4,5-Dihydroxy-4-cyclopentene-1,2,3-trione

  • Croconic acid
Formula
C5H2O5
Structure
Description
Deep yellow powder.

Registry Numbers and Inventories.
CAS
488-86-8
Beilstein/Gmelin
2043130
Beilstein Reference
4-08-00-03342

Properties.
Formula
C5H2O5
Formula mass
142.07
Melting point, °C
150
Boiling point, °C
292
Vapor pressure, mmHg
0.0002 (25 C)
Critical temperature
564
Critical pressure
69.70
Density
2.31 g/cm3 (25 C)
Solubility in water
597 g/L (25 C)
pKa/pKb
0.92 (pKa)
Partition coefficient, pKow
-2.23
Heat of vaporization
61.63 kJ/mol

Hazards and Protection.
Storage
Keep tightly closed. Store in a cool dry place.
Protection
Compatible chemical-resistant gloves. Chemical safety goggles. Protective clothing.
Respirators
Use respirators and components tested and approved under appropriate government standards such as NIOSH (US) or CEN (EU). Respiratory protection is not required. Where protection from nuisance levels of dusts are desired, use type N95 (US) or type P1 (EN 143) dust masks.
Small spills/leaks
Sweep up, place in a bag and hold for waste disposal. Avoid raising dust. Ventilate area and wash spill site after material pickup is complete.
Incompatibilities
Strong oxidizing agents.
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
144
Fire fighting
Extinguish with water spray, carbon dioxide, dry chemical powder or appropriate foam. Wear self-contained breathing apparatus and protective clothing to prevent contact with skin and eyes.
Hazards
Emits toxic fumes under fire conditions.
Health
0
 
Flammability
0
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
May be harmful if swallowed.
   Inhalation
May be harmful if inhaled.
   Skin
May irritate the skin. May be harmful if absorbed through the skin.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If swallowed, wash out mouth with water provided person is conscious. Call a physician.
   Inhalation
If inhaled, remove to fresh air. If not breathing give artificial respiration. If breathing is difficult, give oxygen.
   Skin
In case of contact, immediately wash skin with soap and copious amounts of water. Remove contaminated clothing and shoes. Call a physician.
   Eyes
In case of contact with eyes, flush with copious amounts of water for at least 15 minutes. Assure adequate flushing by separating the eyelids with fingers. Call a physician.

Transport.