Scheme 4.
The synthesis of 3,28-bisTPP⊕ BN 9. Reagents and conditions: (i) Br(CH2)nBr, DMF/MeCN (10/1, v/v), K2CO3, 50 °C, 18–20 h; (ii) triphenylphosphine, Ar, 120 °C, 12–24 h.
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