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Fang and coworkers report a conjugated ladder polymer featuring a rigid coplanar backbone and self-complementary intermolecular hydrogen bonds. The gramscale synthesis was achieved in three steps with overall 66% yield. Reversible hydrogen-bond protection and cleavage enabled solution-phase characterization of this highly insoluble polymer. Solution-processed thin films demonstrated robust resistance to aggressive solvents after simple thermal annealing. Carbonization of this fused-ring polymer leads to carbon materials with high graphitic content.

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