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Reagents and conditions: (a)201 AlCl3, chlorobenzene, reflux, 6 h, 80% from 98.1a or 20% from 98.1b; (b) benzeneseleninic anhydride, chlorobenzene, 130 °C, overnight, 78–95%; (c) TsOH, CHCl3, 50 °C, overnight.
