Metal-Free Synthesis and Photophysical Behaviour of Thermally Stable Blue Fluorescent Styryl-cored Biaryls by Ring Transformation of alpha-pyranone

A simple yet convenient nucleophile-induced synthetic route for the construction of thermally stable fluorescent functionalized stilbenes from alpha-pyranones and aryl ketones has been delineated. The nucleophile-induced base encourage synthetic protocol was performed under mild conditions without harming the environment and products were achieved in good yields. The synthesized stilbenes showed amazing emission properties and good thermal stability. Synthesized products displayed interesting positive solva-tochromism in different solvents based on variation in polarity. (C) 2021 Published by Elsevier B.V.