2,4-Hexadienoic acid

  • (2-Butenylidene)acetic acid
  • Crotylidene acetic acid
  • Hexadienoic acid
  • Hexadienic acid
Formula
CH3CHCHCHCHCOOH
Structure
Description
White crystalline solid, with a weak characteristic odor.
Uses
Mold and yeast inhibitor, fungistatic agent for foods, especially cheeses. To improve characteristics of drying oils. In alkylated type coatings to improve gloss. To improve milling characteristics of cold rubber.

Registry Numbers and Inventories.
CAS
110-44-1
EC (EINECS/ELINCS)
203-768-7
EC Class
irritant
R 36/37/38
RTECS
WG2100000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Primary Irritant
Merck
12,8869
Beilstein/Gmelin
1741831
Beilstein Reference
2-02-00-00452
EPA OPP
75901
Swiss Giftliste 1
G-2856
Canada DSL/NDSL
DSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed
Japan ENCS (MITI)
Listed
Korea ECL
Listed

Properties.
Formula
C6H8O2
Formula mass
112.13
Boiling point, °C
228
Vapor pressure, mmHg
0.02 (25 C)
Vapor density (air=1)
3.87
Saturation Concentration
Very low at normal temperatures.
Evaporization number
Very low at normal temperatures.
Density
1.204 g/cm3 (20 C)
Solubility in water
Very soluble
pKa/pKb
4.76 (pKa)
Partition coefficient, pKow
1.35
Heat of vaporization
51.7 kJ/mol
Heat of combustion
-3112 kJ/mol

Hazards and Protection.
Storage
Store in a cool, dry place. Keep container closed when not in use. Store in a tightly closed container. Store below 40C. Store protected from light.
Does not meet criteria
Handling
Wash thoroughly after handling. Use only in a well ventilated area. Minimize dust generation and accumulation. Avoid contact with eyes, skin, and clothing. Avoid ingestion and inhalation.
Protection
Eyes: 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. 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
Sweep up or absorb material, then place into a suitable clean, dry, closed container for disposal. Avoid generating dusty conditions.
Stability
Stable under normal temperatures and pressures.
Incompatibilities
Oxidizing agents.
Decomposition
Carbon monoxide, carbon dioxide.

Fire.
Flash Point,°C
127
Autoignition, °C
> 130
Fire fighting
Wear a self-contained breathing apparatus in pressure-demand, MSHA/NIOSH (approved or equivalent), and full protective gear. Dusts at sufficient concentrations can form explosive mixtures with air. To extinguish fire, use water fog, dry chemical, carbon dioxide, or regular foam.
Fire potential
This chemical is combustible.

Health.
Poison_Class
-
Exposure effects
   Ingestion
May cause severe gastrointestinal tract irritation with nausea, vomiting and possible burns.
   Inhalation
Irritation may lead to chemical pneumonitis and pulmonary edema. May cause severe irritation of the respiratory tract with sore throat, coughing, shortness of breath and delayed lung edema.
   Skin
May cause severe skin irritation.
   Eyes
May cause eye irritation.

First aid
 
   Ingestion
If victim is conscious and alert, give 2-4 cupfuls of milk or water. Never give anything by mouth to an unconscious person. Get medical aid.
   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.
4. Organic acids
HS Code
2916 19 30