Cl[C:2]1[CH:7]=[CH:6][CH:5]=[C:4]([C:8](OO)=O)[CH:3]=1.C1C2CC=CCC=2C=CC=1.[C:22]([O:25][CH2:26][CH3:27])(=O)C.C(=O)(O)[O-].[Na+]>C(OCC)C>[O:25]1[CH:26]2[CH:22]1[CH2:8][C:4]1[CH:5]=[CH:6][CH:7]=[CH:2][C:3]=1[CH2:27]2Reaction of a 5,8-dihydronaphthalene derivative having the structure ##STR22## with m-chloroperbenzoic acid yields a 6,7-epoxy-5,6,7,8-tetrahydronaphthalene derivative of formula II. The reaction can be carried out by mixing m-chloroperbenzoic acid with a solution of a 5,8-dihydronaphthalene derivative in an organic solvent, e.g., ethyl acetate. The resulting mixture is added to a mixture of ethyl ether and aqueous sodium bicarbonate and mixed to form the 6,7-epoxy-5,6,7,8-tetrahydronaphthalene derivative of formula II.
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