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(A) Successive induction of the boat‐shaped geometry evolving from OPP (top) over TPP (center) to HPH (bottom) as revealed by X‐ray crystallographic analysis (50 % probability level, H‐atoms and solvent molecules omitted). (B) Top view of HPH. (C) Short contacts in the solid state of HPH highlighted in red. (D) Relevant bond angles within the central pyracylene moiety of HPH. (E) Solid‐state packing of HPH.
