At low temperature , the lithium ( potassium ) reagent is made from substituted aromatics . Then , this reagent reacts with hexachloroethane to obtain chlorinated aromatic hydrocarbons with high conversion rate .

将取代芳烃在低温下制成锂（钾）试剂，再与六氯乙烷反应，可以得到较高转化率的氯代芳烃。