Scheme 3.
The synthesis of the 28-TPP⊕ BN derivative 7. Reagents and conditions: (i) Br(CH2)nBr, DMF/MeCN (10/1, v/v), K2CO3, 50 °C, 18–20 h; (ii) Ph3P, argon, 120 °C, 6–12 h.
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