Tributyltin oxide

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Tributyltin oxide
Tributyltin oxide.png
CAS number 56-35-9 YesY
PubChem 16682746
ChemSpider 10218152 YesY
KEGG C18149 N
Jmol-3D images Image 1
Molecular formula C24H54OSn2
Molar mass 596.112
Melting point -45 °C
Boiling point 180 °C at 2 mm Hg
Solubility in water 0.002 g/100 mL
R-phrases R21 R25 R36/38 R48/23/25 R50/53
S-phrases S36/37/39 S45 S60 S61
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Tributyltin oxide (TBTO), or bis(tri-n-butyltin)oxide, is an organotin compound chiefly used as a biocide (fungicide and molluscicide), especially a wood preservative. Its chemical formula is C24H54OSn2. It has the form of a thin, colorless to pale yellow liquid with melting point -45 °C, boiling point 180 °C, and slight water solubility (20 ppm). It is combustible and soluble in organic solvents.

It is available under names AW 75-D, Bio-Met TBTO, Biomet, Biomet 75, BTO, Butinox, C-SN-9, Hexabutyldistannoxane and others.

Tributyltin oxide is a potent skin irritant.

Tributyltin compounds had been used as marine anti-biofouling agents. Concerns over toxicity of these compounds (some reports describe biological effects to marine life at a concentration of 1 nanogram per liter) have led to a worldwide ban by the International Maritime Organization.1 It is now considered a severe marine pollutant and a Substance of very high concern by the EU.


  1. ^ "Focus on IMO - Anti-fouling systems". International Maritime Organisation. 

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