Two different approaches for the synthesis of structurally defined ladder‐type polymers are described. Repetitive Diels‐Alder reaction as well as polymer analogous cyclization of suitable open‐chain precursors are used for generating novel band‐type structures. Polymeric [2.2]‐cyclophanes and ethene‐bridged polyacene precursors are prepared via [4 + 2] cycloaddition reactions. Ladder‐type poly(p‐phenylene) and oligo(perinaphthylenes) as planar π‐systems are obtained by Friedel‐Crafts‐ rsp. by alkali‐metal induced electrocyclic ring‐closure reactions.
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Fahnenstich et al. (1992) studied this question.
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