3-Methyl-2,4-pentanedione

  • 3-Methylacetoacetone
  • 3-Methylacetylacetone
Formula
C6H10O2
Structure
Description
Colorless to light yellow liquid.

Registry Numbers and Inventories.
CAS
815-57-6
EC (EINECS/ELINCS)
212-420-3
R 36/37/38
UN (DOT)
1224
Beilstein/Gmelin
3968871
Beilstein Reference
4-13-00-00540
Korea ECL
Listed

Properties.
Formula
C6H10O2
Formula mass
114.14
Melting point, °C
-31
Boiling point, °C
172-174
Vapor pressure, mmHg
1.3 (25 C)
Critical temperature
334
Critical pressure
35.8
Density
0.981 g/cm3 (20 C)
Solubility in water
Soluble
Refractive index
1.4431 (20 C)
pKa/pKb
10.83 (pKa)
Partition coefficient, pKow
0.69
Heat of vaporization
40.9 kJ/mol
Heat of combustion
-3353 kJ/mol

Hazards and Protection.
Storage
Keep away from sources of ignition. Store in a cool, dry place. Store in a tightly closed container.
Handling
Use spark-proof tools and explosion proof equipment. Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear appropriate protective clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29CFR 1910.134 or European Standard EN 149. Always use a NIOSH or European Standard EN 149 approved respirator when necessary.
Small spills/leaks
Absorb spill with inert material, (e.g., dry sand or earth), then place into a chemical waste container. Remove all sources of ignition. Use a spark-proof tool.
Stability
No data.
Incompatibilities
Strong oxidizing agents, strong bases.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
56
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Combustible Liquid. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.
Fire potential
Combustible Liquid.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion hazard indoors, outdoors or in sewers.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract. The toxicological properties of this substance have not been fully investigated.
   Inhalation
Causes respiratory tract irritation. The toxicological properties of this substance have not been fully investigated.
   Skin
Causes skin irritation.
   Eyes
Causes eye irritation.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately. If not breathing, give artificial respiration. If breathing is difficult, give oxygen. Get medical aid.
   Skin
Get medical aid. Flush skin with plenty of soap and water for at least 15 minutes while removing contaminated clothing and shoes.
   Eyes
Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid.

Transport.
UN number
1224
Response guide
Hazard class
3
Packing Group
I; II; III