Editing Halogenation (section)

===Halogenation of aromatic compounds===
{{main|Aryl halide}}
[[Aromatic compound]]s are subject to [[electrophilic halogenation]]:
:{{chem2|R\sC6H5 + X2 → HX + R\sC6H4\sX}}
This kind of reaction typically works well for [[chlorine]] and [[bromine]]. Often a [[Lewis acid]]ic [[catalyst]] is used, such as [[ferric chloride]].<ref name=PhCl>{{cite book |doi=10.1002/14356007.o06_o03 |chapter=Chlorinated Benzenes and Other Nucleus-Chlorinated Aromatic Hydrocarbons |title=Ullmann's Encyclopedia of Industrial Chemistry |year=2011 |last1=Beck |first1=Uwe |last2=Löser |first2=Eckhard |isbn=978-3527306732 }}</ref> Many detailed procedures are available.<ref>Organic chemistry by Jonathan Clayden, Nick Grieves, Stuart Warren, Oxford University Press</ref><ref>{{OrgSynth|author=Edward R. Atkinson, Donald M. Murphy, and James E. Lufkin |year=1951|title=''dl''-4,4′,6,6′-Tetrachlorodiphenic Acid|volume=31| page=96|doi=10.15227/orgsyn.031.0096}}</ref>
Because [[fluorine]] is so [[Reactivity (chemistry)|reactive]], other methods, such as the [[Balz–Schiemann reaction]], are used to prepare fluorinated aromatic compounds.