4-Methyl-2-pentenoic acid

  • 4,4-Dimethyl-2-butenoic acid
  • 4-Methylpent-2-en-1-oic acid
Formula
C6H10O2
Structure
Description
Colorless liquid.

Registry Numbers and Inventories.
CAS
10321-71-8
EC (EINECS/ELINCS)
233-706-4
S: 20 26 36/37/39 45 60
UN (DOT)
3265
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Korea ECL
Listed

Properties.
Formula
C6H10O2
Formula mass
114.14
Melting point, °C
35
Boiling point, °C
217
Vapor pressure, mmHg
0.052 torr (25 C)
Critical temperature
400
Critical pressure
36.5
Density
0.9529 g/cm3 (21 C)
Refractive index
1.4489 (21<sup>o</sup>C)
pKa/pKb
4.75 (pKa)
Partition coefficient, pKow
1.49

Hazards and Protection.
Storage
Keep container tightly sealed. Store in cool, dry conditions in well sealed containers.
Protection
Protective work clothing. Chemical protective gloves. Safety glasses or goggles.
Small spills/leaks
Absorb with liquid-binding material (sand, diatomite, acid binders, universal binders, sawdust). Use neutralizing agent.
Stability
Decomposition will not occur if used and stored according to specifications.
Incompatibilities
Oxidizing agents, strong bases.

Fire.
Fire fighting
Extinguish with carbon dioxide, extinguishing powder or water spray. Fight larger fires with water spray or alcohol resistant foam. Wear self-contained respirator. Wear fully protective impervious suit.
Health
2
 
Flammability
1
 
 
Reactivity
1
 

Health.
Exposure effects
Corrosive materials are acutely destructive to the respiratory tract, eyes, skin and digestive tract. Eye contact may result in permanent damage and complete vision loss. Inhalation may result in respiratory effects such as inflammation, edema, and chemical pneumonitis. May cause coughing, wheezing, laryngitis, shortness of breath, headache, nausea and vomiting. Ingestion may cause damage to the mouth, throat and esophagus. May cause skin burns or irritation depending on the severity of the exposure.

First aid
 
   Ingestion
Seek medical treatment.
   Inhalation
Supply fresh air. If required, provide artificial respiration. Keep patient warm. Seek immediate medical advice.
   Skin
Immediately wash with water and soap and rinse thoroughly. Seek immediate medical advice.
   Eyes
Rinse opened eye for several minutes under running water. Then consult a doctor.

Transport.
UN number
3265
Response guide
Hazard class
8
Packing Group
III