Tributyltin oxide

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Tributyltin oxide

Identifiers
CAS number	[56-35-9]
SMILES	CCCC[Sn](CCCC)(O[Sn] (CCCC)(CCCC)CCCC)CCCC.
Properties
Molecular formula	C₂₄H₅₄OSn₂
Molar mass	596.112
Melting point	-45 °C
Boiling point	180 °C
Solubility in water	0.002 g/100 mL
Hazards
R-phrases	R21 R22 R23 R25 R36 R37 R38 R48 S35
S-phrases	S36 S37 S39 S45
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) Infobox disclaimer and 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, Hexabutylditin, 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 world-wide ban by the International Maritime Organization. It is now considered a severe marine pollutant.