Isomerization of cyclohexane and hexane over silica- embedded triflate derivative catalysts

Isomerization of cyclohexane and hexane over silica-embedded tert-butyldimethyl- silyltrifluoromethanesulfonate and lanthanum triflate is reported. Immobilization of these triflate derivatives was found to give materials exhibiting at least similar catalytic performances to the free molecules. Using these catalysts, the reactions occured at considerably lower temperatures than those prevailing in industrial processes. The catalysts could be recovered and reused. Traces of water had a favorable influence on the reaction, but led to more cracking to isobutane. Larger amounts of water caused catalyst deactivation.