Novel Dyes Based on Extended Fulvene Motifs: Synthesis via Redox Reactions of Naphthoquinones with Donor‐Acceptor Cyclopropanes and Their Spectroelectrochemical Behavior
Novel dyes based on extended fulvene motifs are reported. The carbon skeleton was generated by a catalyzed addition of donor-acceptor cyclopropanes to naphthoquinone. The hydroxy group at the central ring of the tricyclic fulvene motif was converted into the triflate, which reacted efficiently with a wide range of nucleophiles, resulting in substitution and thereby providing new derivatives. The synthetic versatility allowed us to investigate the absorption, electrochemical, and UV/Vis-NIR spectroelectrochemical properties of these dyes as a function of the substituents. The dyes were shown to participate in reductive electrochemistry, the reversibility of which can be improved by appropriate selection of the substituents. Additionally, first signs of NIR electrochromism are presented, opening new avenues for the future investigations of such dyes.
License Holder: This is the peer reviewed version of the following article: New Dyes Based on Extended Fulvene Motifs: Synthesis through Redox Reactions of Naphthoquinones with Donor–Acceptor Cyclopropanes and Their Spectroelectrochemical Behavior, which has been published in final form at https://doi.org/10.1002/chem.201900764. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
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