Siberian Federal University

This paper presents the results of the alkylation reaction of phenol with diprene (DP), dipentene (DPT), and the isoprene cyclodimer fraction (ICF). The alkylation reactions were carried out in a batch laboratory reactor using the zeolite- containing KN-30 catalyst. To determine the optimal reaction conditions, the effects of temperature (100–160 °C), reaction time (2–6 h), phenol-to-cyclodimer molar ratio (2:1–1:2), and catalyst loading (5–15 wt.%) on the yield and selectivity of the target product were investigated. The experimental results showed that the maximum yield of p-cycloalkylphenols (68.9–75.7 %) and high selectivity (85.3–92.5 %) were achieved at temperatures of 135–145 °C, reaction times of 4.5–6 h, a phenol-to- cyclodimer molar ratio of 1:1, and a catalyst loading of 10–13 wt.%. The structure and composition of the target products were confirmed by infrared (IR) spectroscopy, ¹H and ¹³C NMR spectroscopy, chromatographic analysis, and other physicochemical methods. The obtained results demonstrate the high efficiency of the KN-30 zeolite-containing catalyst in phenol alkylation reactions and indicate its potential for the industrial synthesis of alkylphenols with high selectivity and yield.