Chiral Heptagon‐Embedded Double [6]Helicenes via Scholl Reaction
Abstract
ABSTRACT A series of heptagon‐embedded multiple helicenes was synthesized in which the heptagon subunit was fused to the π‐framework through Knoevenagel condensation reactions. By controlling the conditions of the cyclodehydrogenation (Scholl) reactions, different fused chiral and twisted PAHs were accessible. The optical and electronic properties of all products were investigated by UV–vis, fluorescence spectroscopy, and cyclic voltammetry. One member of the series displays an unusual anti‐Kasha‐like fluorescence emission. In addition, all the enantiopure [6]helicenes were separated by chiral HPLC and characterized by circular dichroism spectroscopy.
Article Details
Authors (7)
Dan Wang
Philipp Penert
Organisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Heidelberg Germany
Lars Schneider
Physikalisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Heidelberg Germany
Moritz P. Schuldt
Organisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Heidelberg Germany
Frank Rominger
Institute of Organic Chemistry
Felix Deschler
Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120 Heidelberg, Germany
Michael Mastalerz
Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 272, Heidelberg 69120, Germany