The concentration of benzene in methylcyclopentane was determined by ultraviolet analysis. Experiment 4 was made by the addition of benzene to a purified sample of methylcyclopentane. The inhibiting effect of benzene upon the isomerization, which was also observed to occur in the case of n-pentane, 6 is probably due to the ease with which the benzene reacts with the chain initiator. The ultraviolet absorption spectra taken of the ...
