Scheme 158. Iterative Synthesis of Pyrazine-Containing Nanoribbons.
Reagents and conditions: (a)313 CHCl3, AcOH, reflux, 48 h; (b) TFA, water, rt; (c) CHCl3, AcOH, reflux, 4 days; (d) (1) TFA, water, rt, (2) CHCl3, AcOH, reflux, 3 days.
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