Abstract
1. The kinetics of the hydrogenolysis of cis-1,3-dimethylcyclopentane in the presence of platinized charcoal was studied. 2. The value of the apparent activation energy of the hydrogenolysis of cis-1,3-dimethylcyclopentane practically does not differ from the corresponding values for cyclopentane and its other homologs. The activation energies of the hydrogenolysis of 1,3-dimethylcyclopentane at various bonds of the ring vary in the interval 36.5–43 kcal/mole. 3. In 1,3-dimethylcyclopentane, the bonds of the ring situated on both sides of the carbon carrying the methyl group are broken with different ease and with different activation energies; an explanation based on conformational concepts has been proposed for this. 4. A study of the previously observed change in the selectivity of the hydrogenolysis of the fivemembered ring in the transition from a flow-type system to a pulsed system was continued with 1,2- and 1,3-diemthylcyclopentanes as examples.
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