ClCC[CH2:4][CH2:5][C:6](Cl)=[O:7].[CH:9]1[C:18]2[C:13](=[CH:14][CH:15]=[CH:16][CH:17]=2)[CH:12]=[CH:11][CH:10]=1.[Cl-:19].[Al+3].[Cl-].[Cl-].Cl>[N+](C1C=CC=CC=1)([O-])=O>[Cl:19][CH2:4][CH2:5][C:6]([C:15]1[CH:16]=[CH:17][C:18]2[C:13](=[CH:12][CH:11]=[CH:10][CH:9]=2)[CH:14]=1)=[O:7]2-chloroethylpropionyl chloride (2.78 g), naphthalene (2.56 g), and aluminium chloride (3.2 g) were reacted in nitrobenzene (9 mL) at 0° C., followed by treatment with hydrochloric acid to obtain the title compound (1.5 g).
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