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Reagents and conditions: (a)83 (1) t-BuLi, chlorobenzene, −45 °C, 4 h or −45 to 0 °C, 3 h, (2) BBr3, (3) 40 °C, 24 h; (b)29 (1) BBr3, o-dichlorobenzene, 150 °C, 12 h; (c)84 BBr3, o-dichlorobenzene, 180 °C, 24 h; (d)86 6 equiv of BI3, 1,2,4-trichlorobenzene, 180 °C, 20 h.
