Tetrahydro-2H-pyran-2-one

  • Tetrahydro-2-pyranone
  • 1-Oxacyclohexan-2-one
  • 5-Valerolactone
  • 5-Hydroxypentanoic acid lactone
  • 2-Oxotetrahydropyran
  • d-Valeryllactone
Formula
C5H8O2
Structure
Description
Clear yellow liquid.

Registry Numbers and Inventories.
CAS
542-28-9
EC (EINECS/ELINCS)
208-807-1
Beilstein/Gmelin
106436
Beilstein Reference
5-17-09-00017
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C5H8O2
Formula mass
100.11
Melting point, °C
-10
Boiling point, °C
228 - 230
Vapor pressure, mmHg
0.13 (25 C)
Density
1.0988 g/cm3 (20 C)
Solubility in water
Very soluble
Refractive index
1.4503 (20 C)
Partition coefficient, pKow
-0.20
Heat of fusion
10.53 kJ/mol
Heat of vaporization
60.25 kJ/mol
Heat of combustion
-2673 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container. Refrigerator (approx 4 C).
Handling
Avoid breathing dust, vapor, mist, or gas. Avoid contact with skin and eyes.
Protection
Eyes: Wear chemical goggles. Skin: Wear appropriate protective gloves to prevent skin exposure. Clothing: Wear a chemical apron.
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. Provide ventilation.
Stability
No data.
Incompatibilities
Strong oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
112
Autoignition, °C
390
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. To extinguish fire use water spray, dry chemical, carbon dioxide, or chemical foam.

Health.
Exposure effects
   Ingestion
May cause irritation of the digestive tract.
   Inhalation
May cause respiratory tract irritation.
   Skin
May cause skin irritation.
   Eyes
Causes eye irritation. May cause eye injury.

First aid
 
   Ingestion
Get medical aid. Wash mouth out with water.
   Inhalation
Remove from exposure to fresh air immediately.
   Skin
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.

Transport.