Scheme 84. Mechanochemical Cyclodehydrogenation of Polyarylpyridines.
Reagents and conditions: (a)166 CoI2, 1,3-bis(diphenylphosphino)propane, Zn, NMP, or DMA, 80 °C, 24 h; (b) K metal, ball milling (30 Hz), rt, 2 h.
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