The addition of bromine and chlorine to a cycloalkane gives a trans-dihalocycloalkane. For example, the addition of bromine to cyclohexene gives trans-1,2-dibromocyclohexane; the cis isomer is not formed.
Addition of bromine to a cycloalkene is highly stereospecific; the halogen atoms always add trans to each other.
"Chemistry" 2e - Blackman, A., Bottle, S., Schmid, S., Mocerino, M., Wille, U.















