Indeno[2,1‐<i>a</i>]fluorene: An Air‐Stable <i>ortho</i>‐Quinodimethane Derivative

Abstract

A new isomer: 11,12-Dimesitylindeno[2,1-a]fluorene was synthesized and isolated in crystal form. The indenofluorene exhibits significant bond-length alternation in the o-quinodimethane structure, limited singlet biradical character, and weakly antiaromatic character. Optical and electrochemical properties suggest that indeno[2,1-a]fluorene derivatives may be candidates for optoelectronic materials. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. 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.