Editing DDT (section)

===Isomers and related compounds===
Commercial DDT is a mixture of several closely related compounds. Due to the nature of the chemical reaction used to synthesize DDT, several combinations of ''ortho'' and ''para'' [[arene substitution pattern]]s are formed. The major component (77%) is the desired ''p'',''p{{'}}'' [[isomer]]. The ''o'',''p{{'}}'' isomeric impurity is also present in significant amounts (15%). [[Dichlorodiphenyldichloroethylene]] (DDE) and [[dichlorodiphenyldichloroethane]] (DDD) make up the balance of impurities in commercial samples. DDE and DDD are also the major [[metabolite]]s and environmental breakdown products.<ref name=EHC009/> DDT, DDE and DDD are sometimes referred to collectively as DDX.<ref>{{cite journal |pmid=22020740 |journal=J. Environ. Monit. |date=December 2011 |volume=13 |issue=12 |pages=3358–3364 |doi=10.1039/c1em10479a |title=Sources of organochlorine pesticides in air in an urban Mediterranean environment: volatilisation from soil |first1=G. |last1=Lammel |s2cid=22071869 |display-authors=et al }}</ref>

<gallery mode="packed" heights="100" caption="Components of commercial DDT" class="skin-invert-image">
File:P,p'-dichlorodiphenyltrichloroethane.svg|''p'',''p{{'}}''-DDT<br />(desired compound)
File:O,p'-dichlorodiphenyltrichloroethane.svg|''o'',''p{{'}}''-DDT<br />(isomeric impurity)
File:P,p'-dichlorodiphenyldichloroethene.svg|''p'',''p{{'}}''-DDE<br />(impurity)
File:P,p'-dichlorodiphenyldichloroethane.svg|''p'',''p{{'}}''-DDD<br />(impurity)
</gallery>