Condensation of t-butyl chloride with cyclohexene yielded very little, if any, of the product (1- chloro-2-t-butylcyclohexane, I) to be expected by the simple addition of the alkyl group and the halogen atom to the doubly-bonded carbon atoms of the cycloolefin. Instead, the principal product was either 1-chloro-1-t-butylcyclohexane (11) or 1-chloro-3-t- butylcyclohexane (111) depending on the catalyst used. Thus, in the presence of ...