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Halonium ion
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<p>A halonium ion is any <a href="/facts/Onium_ion/92qxuw9q">onium ion</a> containing a <a href="/facts/Halogen/YeFgWHeA">halogen</a> atom carrying a positive charge. This <a href="/facts/Cation/wrbwhF3z">cation</a> has the general structure R−+X−R′ where X is any halogen and no restrictions on R, this structure can be cyclic or an open chain molecular structure. Halonium ions formed from <a href="/facts/Fluorine/YUV0Fb8m">fluorine</a>, <a href="/facts/Chlorine/y27UwYBM">chlorine</a>, <a href="/facts/Bromine/oLfj3C7D">bromine</a>, and <a href="/facts/Iodine/JlfMecMf">iodine</a> are called <a href="/facts/Fluoronium/kW03c9rL">fluoronium</a>, chloronium, bromonium, and iodonium, respectively. The 3-membered cyclic variety commonly proposed as intermediates in electrophilic halogenation may be called haliranium ions, using the <a href="/facts/Hantzsch%25E2%2580%2593Widman_nomenclature/JRr8Ua1x">Hantzsch-Widman nomenclature</a> system. </p>