trans-2-Methyl-2-pentenoic acid

  • 2-Pentenoic acid, 2-methyl-, (2E)-
  • (E)-2-Methyl-2-pentenoic acid
  • (E)-2-Methyl-2-pentenoyl chloride
  • (E)-2-Methylpent-2-en-1-oic acid
Formula
C6H10O2
Structure
Description
Colorless to pale yellow liquid. Fruity odor.

Registry Numbers and Inventories.
CAS
16957-70-3
EC (EINECS/ELINCS)
241-026-4
S: 26 36/37/39 45
UN (DOT)
3261
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H10O2
Formula mass
114.14
Melting point, °C
25
Boiling point, °C
214
Vapor pressure, mmHg
0.055 (25 C)
Vapor density (air=1)
>1
Critical temperature
408
Critical pressure
36.3
Density
0.987 g/cm3 (20 C)
Solubility in water
Very soluble
pKa/pKb
5.00 (pKa)
Partition coefficient, pKow
1.51
Heat of vaporization
49.83 jK/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Store in a tightly closed container. Corrosives area.
Protection
Wear appropriate protective eyeglasses or chemical safety goggles as described by OSHA's eye and face protection regulations in 29 CFR 1910.133 or European Standard EN166. Wear appropriate protective gloves and clothing to prevent skin exposure.
Respirators
Follow the OSHA respirator regulations found in 29 CFR 1910.134 or European Standard EN 149. Use a NIOSH/MSHA or European Standard EN 149 approved respirator if exposure limits are exceeded or if irritation or other symptoms are experienced.
Small spills/leaks
Absorb spill with inert material (e.g. vermiculite, sand or earth), then place in suitable container. Avoid runoff into storm sewers and ditches which lead to waterways. Clean up spills immediately, observing precautions in the Protective Equipment section. Provide ventilation.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Strong acids, strong bases, strong oxidizing .
Decomposition
Oxides of carbon.

Fire.
Flash Point,°C
107
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Use water spray to keep fire-exposed containers cool. Extinguish using water spray, dry chemical, carbon dioxide, or chemical foam.
Hazards
Containers can build up pressure if exposed to heat and/or fire.
Combustion products
During a fire, irritating and highly toxic gases may be generated by thermal decomposition or combustion.
Health
3
 
Flammability
1
 
 
Reactivity
0
 

Health.
Exposure effects
   Ingestion
Causes gastrointestinal tract burns.
   Inhalation
Causes chemical burns to the respiratory tract.
   Skin
Causes burns
   Eyes
Causes burns

First aid
 
   Ingestion
If swallowed, do NOT induce vomiting. Get medical aid immediately. If victim is fully conscious, give a cupful of water. Never give anything by mouth to an unconscious person.
   Inhalation
Get medical aid immediately. Remove from exposure and move to fresh air immediately. If breathing is difficult, give oxygen. Do NOT use mouth-to-mouth resuscitation. If breathing has ceased apply artificial respiration using oxygen and a suitable mechanical device such as a bag and a mask.
   Skin
In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Get medical aid immediately. Wash clothing before reuse.
   Eyes
Immediately flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Get medical aid immediately. Do NOT allow victim to rub eyes or keep eyes closed.

Transport.
UN number
3261
Response guide
Hazard class
8
Packing Group
III