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Phenanthrene syntheses via photochemical methods; a) cyclopentadiene (5.0 equiv.), CH3CN, μW, 100 °C, 3 h; b) Cs2CO3 (1.1 equiv.), [Ru(bpy)3]Cl2 ⋅ 6 H2O (2 mol%), CH3CN, Blue LED (28 W), rt, 16 h.; c) PhSO2H (2.0 equiv.), CH2Cl2/t‐BuOH (8 : 1), rt, 12 h.
