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Synthesis of triptycene end‐capped indigo 4 and bay annulated indigo 5. a) Cl3CCH(OH)2, HONH2 ·HCl, HCl, 80 °C, 20 h, 95 %; b) MeSO3H, 50 °C, 4 h, 85 %; c) (i) PCl5, PhMe, 100 °C, 4 h; (ii) PhSH, 50 °C, 16 h, (57 % over two steps). d) 2‐Thiophene acetyl chloride, o‐xylene, 155 °C, 48 h, 30 %.
