Wednesday, February 20, 2008

Glossary - Alkyl and Aryl Halides for IIT JEE

Allylic, Akyl, arylic, benzylic and vinylic carbon, Hydrogen, halide

allylic carbon: a carbon adjacent to a C=C double bond
allylic hydrogen: a hydrogen on an allylic carbon
an allylic C-H bond is weaker than a vinylic C-H bond

Alkyl halide: a compound containing a halogen atom covalently bonded to an sp3 hybridized carbon atom.
Given the symbol R-X

If it is bonded to a benzene ring, it is called an aryl halide, given the symbol Ar-X

carbon next to a benzene ring is called benzylic carbon and the hydrogens on benzylic carbon are called benzylic hydrogens

If the halogen is bonded to an sp² hybridized carbon, it is a called a vinylic halide

Allylic and benzylic positions are more reactive than other positions in free radical halogenations

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