Difference between revisions of "Warfarin"

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Warfarin should kept in sealed vials, with a proper hazardous chemical label.
Warfarin should kept in sealed vials, with a proper hazardous chemical label, in a locked cabinet.

Latest revision as of 23:08, 3 January 2021

Warfarin structure.png
Chemical structure of warfarin
IUPAC name
(RS)-4-Hydroxy-3-(3-oxo-1-phenylbutyl)- 2H-chromen-2-one
Other names
Molar mass 308.333 g/mol
Appearance White solid
Odor Odorless
Density 1.4 g/cm3
Melting point 161 °C (322 °F; 434 K)
Boiling point Decomposes
0.17 g/100 ml (20 °C)
Solubility Soluble in acetone, chloroform, DCM, dioxane
Moderately soluble in ethanol, isopropanol, methanol, some oils
Freely soluble in alkaline aqueous solution (forms a water-sol sodium salt)
Practically insoluble in benzene, cyclohexane, hexane, pentane
Solubility in acetone 6.5 g/100 ml (20 °C)
Solubility in chloroform 5 g/100 ml (20 °C)
Solubility in dioxane 10 g/100 ml (20 °C)
Vapor pressure 0.09 mmHg at 20 °C
Acidity (pKa) 5.87
Safety data sheet DuPont
Lethal dose or concentration (LD, LC):
1.6 mg/kg (rat, oral)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Warfarin, sold under the brand name Coumadin among others, is an organic chemical compound, used and sold as anticoagulant (blood thinner) in medicine and as rat poison.



Warfarin consists of a racemic mixture of two active enantiomers—R- and S- forms—each of which is cleared by different pathways. S-warfarin is 2-5 times more potent than the R-isomer in producing an anticoagulant response.


Warfarin is a colorless solid, odorless and tasteless. It is almost insoluble in water, but more soluble in some organic solvents, like acetone, halogenated solvents (chloroform e.g.), dioxane and somewhat soluble in alcohols.


Warfarin is sold in pharmacies, though it can only be acquired via prescription.

It is classified as an extremely hazardous substance in the United States as defined in Section 302 of the U.S. Emergency Planning and Community Right-to-Know Act (42 U.S.C. 11002), and is subject to strict reporting requirements by facilities which produce, store, or use it in significant quantities.


Warfarin can be prepared from coumarin, which itself can be obtained from the fermentation of sweet clover, though the amount obtained from this route is very small to be practical. It's better to use synthetic coumarin as precursor.

A much quicker route involves 4-hydroxycoumarin and benzalacetone. The reaction produces racemic warfarin.


  • Pesticide
  • Compound collecting



Warfarin is toxic if ingested and large amounts may lead to death. Vitamin K is used as antidote.


Warfarin should kept in sealed vials, with a proper hazardous chemical label, in a locked cabinet.


Should be destroyed with an oxidizing mixture, like chromic acid, Fenton's reagent or piranha solution.


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