Dichlorooctylisothiazolinone, DCOIT or DCOI, is the

organic compound Some chemical authorities define an organic compound as a chemical compound that contains a carbon–hydrogen or carbon–carbon bond; others consider an organic compound to be any chemical compound that contains carbon. For example, carbon-co ...

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 us ...

, 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 organic chemistry is the branch of organic chemistry dealing with the synthesis, proper ...

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 United States Environmental Protection Agency, En ...

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

organotin compounds Organotin chemistry is the scientific study of the synthesis and properties of organotin compounds or stannanes, which are organometallic compounds containing tin–carbon bonds. The first organotin compound was diethyltin diiodide (), discove ...

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 Isothiazolinones Chloroarenes