4-(2,4-Dichlorophenoxy)butyric acid

  • Butirex
  • 2,4-D butyric acid
  • 4-(2,4-Dichlorophenoxy)butanoic acid
  • 2,4-DB
  • (2,4-Dichlorophenoxy)butyric acid
  • Embutone
Formula
C10H10Cl2O3
Structure
Description
Colorless crystals.
Uses
Control of broad-leafed plants in row crops, defoliants, general brush control. Chlorophenoxy compounds, from table.

Registry Numbers and Inventories.
CAS
94-82-6
EC (EINECS/ELINCS)
202-366-9
EC Index Number
607-083-00-8
EC Class
Harmful; Dangerous for the Environment
R 22 51/53
S 25 29 46 61
RTECS
ES9100000
RTECS class
Agricultural Chemical and Pesticide; Mutagen; Reproductive Effector
UN (DOT)
2765
Merck
13,2855
Beilstein/Gmelin
1976809
Beilstein Reference
4-06-00-00927
EPA OPP
30801
Swiss Giftliste 1
G-4458
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C10H10Cl2O3
Formula mass
249.09
Melting point, °C
118
Boiling point, °C
150 (0.2 torr)
Vapor pressure, mmHg
4E-6
Solubility in water
46 ppm at 25 C
pKa/pKb
4.95 (pKa)
Partition coefficient, pKow
3.53

Hazards and Protection.
Storage
Keep in a cool, dry, dark location in a tightly sealed container or cylinder. Keep away from incompatible materials, ignition sources and untrained individuals. Secure and label area. Protect containers/cylinders from physical damage.
Handling
All chemicals should be considered hazardous. Avoid direct physical contact. Use appropriate, approved safety equipment. Untrained individuals should not handle this chemical or its container. Handling should occur in a chemical fume hood.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Do not touch damaged containers or spilled material unless wearing appropriate protective clothing. Stop leak if you can do it without risk. Cover with plastic sheet to prevent spreading. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. DO NOT GET WATER INSIDE CONTAINERS.
Stability
No data.

Fire.
Fire fighting
Small Fires: Dry chemical, carbon dioxide or water spray. Large Fires: Water spray, fog or regular foam.
Fire potential
Combustible material: may burn but does not ignite readily.
Hazards
Containers may explode when heated.
Combustion products
Fire may produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
3
Exposure effects
   Ingestion
Nausea, vomiting, and diarrhea may be noted following ingestion.
   Inhalation
Highly toxic, may be fatal if inhaled, swallowed or absorbed through skin. Effects of contact or inhalation may be delayed.
   Skin
Cyanosis unresponsive to oxygen therapy may be noted in patients with methemoglobinemia due to absorption of excessive amounts of these agents.
   Eyes
See Skin.

First aid
 
   Ingestion
Seek medical assistance.
   Inhalation
Move victim to fresh air. Apply artificial respiration if victim is not breathing. Do not use mouth-to-mouth method if victim ingested or inhaled the substance; induce artificial respiration with the aid of a pocket mask equipped with a one-way valve or other proper respiratory medical device. Administer oxygen if breathing is difficult.
   Skin
Remove contaminated clothing and wash exposed area thoroughly with soap and water. A physician should examine the area if irritation or pain persists.
   Eyes
Irrigate exposed eyes with copious amounts of tepid water for at least 15 minutes. If irritation, pain, swelling, lacrimation, or photophobia persist, the patient should be seen in a health care facility.

Transport.
UN number
2765
Response guide
Hazard class
3.2