11,11'-Biindeno[2,1-a]azulenylidenes: potassium tert-butoxide-promoted homocoupling of 11H-indeno[2,1-a]azulenes and their optical properties.

Authors

Masayuki Iwabuchi, Miku Yoshida, Hiroyasu Morita, Shigeki Mori, Tetsuo Okujima, Ryuta Sekiguchi, Shunji Ito, Taku Shoji

Published in

Chemical communications (Cambridge, England). Aug 24, 2026. Epub Aug 24, 2026.

Abstract

t-BuOK-promoted homocoupling of 11H-indeno[2,1-a]azulenes enables direct synthesis of twisted 11,11'-biindeno[2,1-a]azulenylidenes. X-ray analysis confirms nonplanar central CC units, yet the π-systems retain strong electronic communication, visible-to-near-infrared absorption, and acid-responsive halochromism, highlighting torsional distortion as a design element in nonbenzenoid π-systems.

PMID:
42635623
Bibliographic data and abstract were imported from PubMed on 24 Aug 2026.

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