Charge‐Transfer Chromophores by Cycloaddition–Retro‐electrocyclization: Multivalent Systems and Cascade Reactions

It all clicks into place: The cycloaddition of tetracyanoethylene (TCNE) to electron-rich alkynes (“click” reaction) followed by retro-electrocyclization affords multivalent charge-transfer chromophores that accept up to 24 electrons. The cascade additions of TCNE and tetrathiafulvalene (TTF) to polyynes provides access to conjugated donor–acceptor-substituted [AB] oligomers with promising optoelectronic properties (see scheme). Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2002/2007/z701733_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.