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Updated: Jun 16, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
Published on: September 26, 2016
Post-Modification of Tripyrenylenes to Enantiopure π-Extended D3-Symmetric Propellers
Dennis Popp1, Melanie Bruttel1, Sebastian Möbert1
1Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
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A palladium-catalyzed trimerization of a pyrene-based Kobayashi aryne precursor and post-functionalization of the obtained tripyrenylene was used to synthesize polycyclic aromatic hydrocarbons with multiple helicene subunits. The isomerization of the obtained C2-isomers to the corresponding propeller-shaped D3-isomers was investigated and the enantiomers of a D3-pyrenylene as well as a D3-trisphenanthrophenazine were isolated. Their chiroptical properties as well as the crystalline packings in comparison to the corresponding racemates were studied and the isomerization as well as racemization processes were investigated kinetically and by quantum chemical calculations.
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