Synthesis of Single‐Handed Helical Spiro‐Conjugated Ladder Polymers through Quantitative and Chemoselective Cyclizations**

We report the unprecedented synthesis of one‐handed helical spiro‐conjugated ladder polymers with well‐defined primary and secondary structures, in which the spiro‐linked dibenzo[ a , h ]anthracene fluorophores are arranged in a one‐handed twisting direction, through quantitative and chemoselective acid‐promoted intramolecular cyclizations of random‐coil precursor polymers composed of chiral 1,1′‐spirobiindane and achiral...