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1,4‐Diketopyrrolo[3,4‐c]pyrroles (DPPs) constitute a class of hydrogen‐bonded pigments covering a color range from yellow–orange to dark violet. We report facile dimerization of a Boc‐substituted 3,6‐dithienyl‐DPP. The formed dimer shows brilliantly blue color as a result of the expansion of the chromophore. The soluble dimer acts as latent pigment and is converted to the corresponding pigment either...
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