Methylpentanes particle size effects

Fig. 8. Particle size effect in isomerization of 2-methylpentane-2- C to 3-methylpentanes contribution of cyclic mechanism.

Fig. 16. Particle size effects in isomerization of 2-methylpentane to 3-methylpentane. SCM, selective cyclic mechanism NSCM, nonselective cyclic mechanism.

In order to discuss the effect of particle size on selectivity we must consider the mechanisms that have been proposed to explain the isomerization of 2-methylpentane to 3-methylpentane and the hydrogenolysis of methylcyclopentane. These matters have been extensively studied (22, 24, 200, 280), and we discuss here only the elementary aspects of the problem. Gault and his group (280) have proposed the following sequence, in which the reactant is 2-methylpentane-2-l3C the labeled carbon is indicated by the black dot. 

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