1,1 -Dime thylcyclopentane

The zeolite structure also plays a large role in RC product distribution. Weitkamp et al.62 conducted experiments with Pt/HZSM-5 catalysts, which have very narrow pore sizes when compared with other zeolites, such as USY or SAPO. They found that c is I trans-1,3-dime thylcyclopentane was formed, while 1,1 and 1,2-DMCP were not. This indicates that the more oval shaped 1,3-DMCP was able to diffuse through the pores, while the more bulky and spherical isomers were not, and thus not seen in the product distribution. In short, when compared with dealkylation to cyclohexane, ring contraction of MCH is a more effective pathway to yield higher ON products. However, in order to further improve the ON, ring-opening of the RC isomers may be necessary, as shown below. 

Problem 3.7. Cast the two-dimensional representation of 1,3-dimethylcyclopentane (Figure 3.9b) into the appropriate three-dimensional representations of E)- and (Z) -1,3-dime thylcyclopentane, respectively. 

Problem 3.21. In Figure 3.9, two-dimensional (flat ) representations for 1,2-dime thylcyclopentane and l,3-dimethyl(yclopentane were presented and are reproduced in the figure ... 

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