Bromination of methylene groups exocyclic to cyclohexyl systems can afford,
besides the expected trans-dibromo products, considerable quantities of a
tribromide. For example, simple bromination of 4-t-butyl-1-methylidenecyclo
hexane affords c. 20% yield of (r-1,t-2,c-4)-1,2-dibromo-1-bromomethyl-4-t-
butylcyclohexane.