[C:1]1([S:7][C:8]2[CH:13]=[CH:12][C:11]([OH:14])=[CH:10][CH:9]=2)[CH:6]=[CH:5][CH:4]=[CH:3][CH:2]=1.Br[CH:16]1[CH2:20][CH2:19][CH2:18][CH2:17]1.C(=O)([O-])[O-].[K+].[K+].Cl>C1(C)C=CC=CC=1.CN(C=O)C>[C:1]1([S:7][C:8]2[CH:13]=[CH:12][C:11]([O:14][CH:16]3[CH2:20][CH2:19][CH2:18][CH2:17]3)=[CH:10][CH:9]=2)[CH:2]=[CH:3][CH:4]=[CH:5][CH:6]=1A solution was prepared by combining 11.3 g of 4-hydroxyphenyl phenyl sulfide which had been synthesized according to the well-known formulation, 8.2 g of bromocyclopentane, 7.6 g of potassium carbonate, and 40 g of DMF. The solution was aged at 80° C. for 16 hours. The aged solution was cooled to room temperature, to which 100 g of 5 wt % dilute hydrochloric acid was added to quench the reaction. To the solution, 150 g of toluene was added for extraction. The organic layer was separated and washed with water. It was combined with 5 wt % sodium hydroxide aqueous solution. The organic layer was separated and washed with water again. On subsequent concentration in vacuum, 13.8 g of the target compound, 4-cyclopentyloxyphenyl phenyl sulfide was obtained as oily matter. Yield 100%.
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