Scheme 25. cata-Condensed Heteroannulated Coronenes.
Reagents and conditions: (a)45 2.2 equiv of NBS, DCM, rt, 1 h; (b) 5 mol % of Pd2(dba)3, 7.5 mol % of t-Bu3P·HBF4, THF, K2CO3, 80 °C 16 h; (c) I2, hν, propylene oxide, cyclohexane, 4 h.
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