6533b825fe1ef96bd1282651

RESEARCH PRODUCT

ChemInform Abstract: Synthesis of Areno-Condensed [24]Annulenes.

Herbert MeierMichael FettenChristoph Schnorpfeil

subject

Chrysenechemistry.chemical_compoundCrystallographyDifferential scanning calorimetrychemistryAlkoxy groupMoleculeGeneral MedicineAnnuleneSolubilityCondensation reactionRing (chemistry)

description

[24]Annulenes condensed with three phenanthrene units (11a−d) or with three chrysene ring systems (22) were prepared by multi-step syntheses. The cyclic condensation reaction in the final step led to highly symmetrical compounds. Long flexible alkoxy groups attached to the periphery enhance the solubility and give rise to a strong aggregation of the molecules which was observed in solution by NMR and fluorescence excitation spectroscopy, and in the pure state by the detection of liquid crystalline phases in differential scanning calorimetry and polarization microscopy.

https://doi.org/10.1002/chin.200204133