Dichlorprop

  • 2-(2,4-Dichlorophenoxy)propionic acid
  • Dichloroprop
  • 2,4-DP
Formula
C9H8Cl2O3
Structure
Description
Yellowish to colorless solid.
Uses
Herbicide, plant growth regulator.

Registry Numbers and Inventories.
CAS
120-36-5
EC (EINECS/ELINCS)
204-390-5
EC Index Number
607-045-00-0
EC Class
Harmful; Irritant
R 21/22 38 41
S 26 36/37
RTECS
UF1050000
RTECS class
Agricultural Chemical and Pesticide; Tumorigen; Mutagen; Reproductive Effector
UN (DOT)
2765
Merck
13,3104
Beilstein/Gmelin
2213812
Beilstein Reference
3-06-00-00707
EPA OPP
31401
Swiss Giftliste 1
G-3363
Canada DSL/NDSL
NDSL
US TSCA
Listed
Austrailia AICS
Listed
New Zealand
Listed

Properties.
Formula
C9H8Cl2O3
Formula mass
235.07
Melting point, °C
117 - 118
Boiling point, °C
334
Critical temperature
542
Critical pressure
31.3
Density
1.42 g/cm3 (20 C)
Solubility in water
Insoluble
pKa/pKb
3.2 (pKa)
Partition coefficient, pKow
2.78

Hazards and Protection.
Storage
If stored below freezing, it may be necessary to warm to 40F and agitate before using.
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
Goggles, long-sleeved shirt and pants.
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
Stable to heat, and resistant to reduction, hydrolysis and atmospheric oxidation. The acid is very stable, and forms sparingly-soluble, slightly-active salts withheavy metals. The esters are hydrolyzed on warming with acids or alkalis.
Decomposition
When heated to decomposition it emits toxic fumes of hydrogen chloride.

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
Low dose exposures - vertigo, headache, malaise, and paresthesias may occur depending on the specific compound involved. High dose exposures - muscle twitching, spasms, profound weakness, polyneuritis, and unconsciousness may occur depending on the specific compound involved. Idiosyncratic reactions - peripheral neuropathies 2,4-D and 2,4,5-T have caused adverse reproductive effects in experimental animals. Allegations of human birth defects due to these compounds have not been confirmed.
   Ingestion
Nausea, vomiting, and diarrhea have been reported. Necrosis of the gastrointestinal mucosa has been reported.
   Inhalation
Ingestion of large amounts may cause bradypnea, respiratory failure, hyperventilation, or pulmonary edema.
   Skin
Direct contact may cause skin irritation. Chlorodioxin contamination of products may produce chloracne with heavy exposure.
   Eyes
Eye, nose, and mouth irritation are possible with direct contact.

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 and isolate contaminated clothing and shoes. Immediately flush with running water for at least 20 minutes. For minor skin contact, avoid spreading material on unaffected skin.
   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
6.1