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Reagents and conditions: (a)262 2 equiv of BBr3, toluene, reflux, 20 h; (b) 4 equiv of BBr3, chlorobenzene, reflux, 20 h; (c) 12 equiv of BBr3, benzene, reflux, 20 h; (d) 24 equiv of BBr3, chlorobenzene, reflux, 20 h; (e) 1 equiv of BBr3, o-dichlorobenzene, 170 °C, 20 h.
