Synthesis and Optical Properties of π-Conjugated Azulenes

Nurlan Merkhatuly, Amantay Iskanderov, Saltanat Zhokizhanova, Г.Т. Кокибасова

2023

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DOI 10.1134/s1070428023050068
Data confidence 70 medium
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Abstract

Abstract The Knoevenagel condensation of azulenyl ketones with malononitrile resulted in the synthesis of π-conjugated 1-mono- and 1,3-bis(phenyldicyanovinyl)azulenes, and the Kumada cross-coupling reaction of bromazulenes with PhMgBr gave 1-mono- and 1,3-biphenylazulene. The electronic spectra of dicyanovinylated azulenes showed strong absorption bands of intramolecular charge transfer in the visible region, as well as significant bathochromic shifts of the absorption maxima of phenylazulenes.