Scheme 18. Coronenoid Containing Four NBN Units.
Reagents and conditions: (a)32 CBr4, PPh3, DCM, −50 to 25 °C; (b) R-NH2, t-BuONa, Pd2(dba)3, dppf, toluene, 120 °C; (c) BF3·Et2O, Et3N, DCM, 50 °C.
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