A large amount of C5-fraction is obtained at the pyrolysis process of low-octane gasoline which has not been determined effective area of utilization. The products of pyrolysis are collected in factories that is the most harmfull for biosphere. The C5-fractions which is rich with isoprene and piperine is condensed with etilene for getting 1- and 3- methylcyclohexens then it was involved in alkylation reactions with phenol and para cresol. The acylation reaction of alkylphenols is one the promising area in petroleum chemistry. They are used as the feedstock for the synthesis of high-perpformance thermal and photo stabilizers for polyolefin, additives to oil and fuels. At the first step, catalytic cycloalkylation reactions occurs phenol and para-cresol with 1-methylcyclopentene and 1(3)-methylcyclohexene in the presence of KY-23 catalyst. According to the results of researches, it was investigated the effects of some parameters (temperature, duration, mol ratio of reagents, amounts of catalyst) on the actual yield of products and selectivity. For each reactions, it was examined the optimal conditions. It was found the the actual yields of products were 71.3-76.7% and selectivity of products were 91.3-96.7. At the next step, the methylcycloalkylacetophenones were obtained the acylation reaction of paracycloalkylphenols with acetic acid in the presence of nanosized ZnCl2 as a catalyst and the yield was 51.356.7%. The pure products was obtained by rectification at 5 mm Hg and structural formula, element composition, physico-chemical parameters of products were determined.