Ultrasound accelerated solvent-free condensation reaction of rhodanines and carbonyls using Amberlyst 26 as a green and efficient base catalyst

Abstract

The solvent-free condensation reaction of various aliphatic aldehydes, cycloalkanones, and benzaldehydes with rhodanines catalyzed by Amberlyst 26 has been reported. The catalyst's efficiency, simple work-up, simple recycling procedure, and high catalyst recyclability without any considerable change of yields several times were found to be interesting. Furthermore, the drastic acceleration of ultrasound irradiation was realized to be efficient for the formation of alkylidenerhodanine, cycloalkylidene-rhodanine, and arylidenerhodanine in moderate to good yields within a short time.