Difenacoum

  • Diphenacoum
  • 3-(3-Biphenyl-4-yl-1,2,3,4-tetrahydro-1-naphthyl)-4-hydroxycoumarin
Formula
C31H24O3
Structure
Description
Off-white, odorless, tasteless powder.
Uses
Difenacoum is used to control rats and mice resistant to other anticoagulants with varying degrees of activity. Not registered for use in the US.

Registry Numbers and Inventories.
CAS
56073-07-5
EC (EINECS/ELINCS)
259-978-4
EC Index Number
607-157-00-X
RTECS
GN4934500
RTECS class
Agricultural Chemical and Pesticide
UN (DOT)
3024
Beilstein/Gmelin
8360065
Beilstein Reference
-
EPA OPP
119901
Swiss Giftliste 1
G-10214
Austrailia AICS
Listed
Korea ECL
Listed

Properties.
Formula
C31H24O3
Formula mass
444.55
Boiling point, °C
648
Vapor pressure, mmHg
1.1E-17 (25 C)
Solubility in water
84 mg/L (20 C)
pKa/pKb
4.50 (pKa)
Heat of vaporization
100.4 kJ/mol

Hazards and Protection.
Storage
Technical difenacoum and formulations should be stored in sealed containers in locked, well-ventilated, dry areas away from frost, direct sunlight, and sources of heat and ignition. Keep products out of reach of children and unauthorized personnel. Do not store near food or animal feed.
Protection
Wear appropriate protective gloves, clothing and goggles.
Respirators
Wear positive pressure self-contained breathing apparatus (SCBA).
Small spills/leaks
Make no contact with the spilled material. Fully encapsulating, vapor protective clothing should be worn for spills and leaks with no fire. ELIMINATE all ignition sources and ground all equipment. Stop leak if you can do it without risk. A vapor suppressing foam may be used to reduce vapors. Absorb or cover with dry earth, sand or other non-combustible material and transfer to containers. Use clean non-sparking tools to collect absorbed material.
Stability
Stable to light, and to temps up to 100 deg C
Decomposition
High-temperature decomposition or burning in air will lead to the formation of toxic gases, which may include carbon monoxide as well as fumes of unchanged rodenticide.

Fire.
Flash Point,°C
258
Fire fighting
Use of water spray when fighting fire may be inefficient. Small Fires: Dry chemical, CO2, water spray or alcohol-resistant foam. Large Fires: Water spray, fog or alcohol-resistant foam.
Fire potential
HIGHLY FLAMMABLE: Will be easily ignited by heat, sparks or flames.
Hazards
Vapors may form explosive mixtures with air. Vapors may travel to source of ignition and flash back. Most vapors are heavier than air. They will spread along ground and collect in low or confined areas (sewers, basements, tanks). Vapor explosion and poison hazard indoors, outdoors or in sewers.
Combustion products
Fire will produce irritating, corrosive and/or toxic gases.

Health.
Poison_Class
1
Exposure effects
   Ingestion
See inhalation.
   Inhalation
May be fatal. May cause irritatior or burns. Vapors may cause dizziness or suffocation.
   Skin
See inhalation.
   Eyes
See inhalation.

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. Remove and isolate contaminated clothing and shoes.
   Skin
Remove and isolate contaminated clothing and shoes. In case of contact with substance, immediately flush with running water for at least 20 minutes. Wash skin with soap and water.
   Eyes
In case of contact with substance, immediately flush with running water for at least 20 minutes.

Transport.
UN number
3024
Response guide
Hazard class
6.1