Editing Halogenation (section)

===Other halogenation methods===
In the [[Hunsdiecker reaction]], [[carboxylic acids]] are converted to [[organic halide]], whose [[carbon chain]] is shortened by one [[carbon]] atom with respect to the carbon chain of the particular carboxylic acid. The carboxylic acid is first converted to its [[silver]] salt, which is then oxidized with [[halogen]]:
:{{chem2|R\sCOO−Ag+ + [[Bromine|Br2]] → R\sBr + [[carbon dioxide|CO2]] + [[Silver bromide|Ag+Br−]]}}
:{{chem2|[[Silver acetate|CH3\sCOO−Ag+]] + Br2 → [[Bromomethane|CH3\sBr]] + CO2 + Ag+Br−}}

Many [[organometallic compound]]s react with halogens to give the organic halide:
:{{chem2|RM + X2 → RX + MX}}
:{{chem2|[[n-Butyllithium|CH3CH2CH2CH2Li]] + [[Chlorine|Cl2]] → [[1-chlorobutane|CH3CH2CH2CH2Cl]] + [[Lithium chloride|LiCl]]}}