Dichlorooctylisothiazolinone, DCOIT or DCOI, is the

organic compound In chemistry, organic compounds are generally any chemical compounds that contain carbon-hydrogen or carbon-carbon bonds. Due to carbon's ability to catenate (form chains with other carbon atoms), millions of organic compounds are known. The ...

with the formula SC(Cl)=C(Cl)C(O)NC₇H₁₅. It is a white solid that melts near room temperature. It is an

isothiazolinone Isothiazolinone (sometimes isothiazolone) is an organic compound with the formula (CH)2SN(H)CO. A white solid, it is structurally related to isothiazole. Isothiazolone itself is of limited interest, but several of its derivatives are widely used ...

, a class of

heterocyclic compound A heterocyclic compound or ring structure is a cyclic compound that has atoms of at least two different elements as members of its ring(s). Heterocyclic chemistry is the branch of organic chemistry dealing with the synthesis, properties, and ...

s used as

biocides A biocide is defined in the European legislation as a chemical substance or microorganism intended to destroy, deter, render harmless, or exert a controlling effect on any harmful organism. The US Environmental Protection Agency (EPA) uses a sli ...

. DCOIT has attracted attention as an antifouling compound. It is a replacement for

organotin compounds Organotin compounds or stannanes are chemical compounds based on tin with hydrocarbon substituents. Organotin chemistry is part of the wider field of organometallic chemistry. The first organotin compound was diethyltin diiodide (), discovered by ...

that have been largely banned for causing environmental damage. DCOIT however is itself controversial.

Safety

{{main, Isothiazolinone Isothiazolinones are highly bioactive and have attracted scrutiny for causing contact dermatitis.

References

Preservatives Isothiazolidinones Chloroarenes