In the presence of Lewis acid catalysts, such as is prepared by the action of on . To add a phenyl group into other molecules is used. One procedure requires the conversion to phenyl , the Grignard reagent.
is not an alkyl halide since it is bound to the carbon of a benzene ring by a halogen atom (). This means a secondary alkyl halide is the molecule. The carbon that the is bound to be bonded closely to three other carbons with (), rendering it a tertiary alkyl halide.