Explore: Halonium Ions

ion X+ to a C=C double bond, as when a halogen is added to an alkene. The formation of 5-membered halonium ions (e.g., chlorolanium, bromolanium ions)

"Stable carbonium ions. XLVIII. Halonium ion formation via neighboring halogen participation. Tetramethylethylene halonium ions". Journal of the American

onium compounds are inversely analogous to -ate ions and ate complexes: Lewis bases form onium ions when the central atom gains one more bond and becomes

2 H2O The addition of halogens to alkenes proceeds via intermediate halonium ions. In special cases, such intermediates have been isolated. Bromination

derivatives. Cyclohexene derivatives, such as imines, epoxides, and halonium ions, react with nucleophiles in a stereoselective fashion, affording trans-diaxial

open-chain halonium ions (such as [Me2Cl]+[Al(OTeF5)4]–) as well as cyclic haliranium ions, fluorine was not believed to form fluoronium ions of type R–+F–R

reductive elimination. Prominent hyper leaving groups include various halonium ions, such as diaryl iodonium salts; and other λ3-iodanes. Hyper leaving

derivatives from the nucleophilic abstraction reaction. An iminium ion reacts with a halonium ion formed in situ by reaction of an alkene with iodine. Lactams

formation of the arenium ion results in the temporary loss of aromaticity, which has a higher activation energy compared to halonium ion formation in alkenes

electrophilic addition to the alkene group with electrophiles such as halonium ions, Brønsted acids and Lewis acids. In type 3 the substrates are epoxides