Cycloalkenylation of phenol with 4-vinylcyclohexene was studied in the presence of zeolite-Y catalyst, saturated by orthophosphoric acid on the batch unit. Phenol and 4-vinylcyclohexene were used as initial products for the realization of cycloalkenylation reaction. Cyclodimerization is realized in liquid phase in the presence of copper on zeolite as a catalyst, which has high selectivity according to buta-1,3diene. All the separated products of reaction were characterized and their physico-chemical properties were determined. Chromatographic analysis was identified on chromatographer LKhM-72 with thermal conductivity detector. Synthesized p-(cyclohexenylethyl)phenol was identified by NMR and IR techniques. It is evident that the yield of target product p-(cyclohexenylethyl)phenol at optimum regime amounts to 72.4 % on theoretically, but selectivity found to be 97.7 % according to the target product. Tri-[p-(cyclohexenylethyl)phenyl phosphite was obtained by the interaction of p-(cyclohexenylethyl)phenol with phosphorus trichloride and tested as an antioxidant for turbine oil T-46.