One-pot two-step synthesis of 4-vinylphenols from 4-hydroxy substituted benzaldehydes under microwave irradiation: a new perspective on the classical Knoevenagel–Doebner reaction

Solvent-free highly regioselective Michael addition of phenytoin to α,β-unsaturated esters in the presence of TBAB under ultrasound irradiation

“…Therefore, recently, ultrasonic irradiation technique has received considerable attention of researchers. [21][22][23][24][25] In continuation of our ongoing research on the Michael addition of imides and amides to unsaturated systems, 26,27 we report here an efficient strategy for synthesis of a series of DPH derivatives by Michael addition of this compound to α,β-unsaturated esters under ultrasound irradiation (Scheme 2).…”

Solvent-Free Synthesis of Carboxylic Acids and Amide Analogs of CAPE (Caffeic Acid Phenethyl Ester) under Infrared Irradiation Conditions

“…Our team prepared the cinnamic acid analogs that were not commercially available-4-(4-chlorophenoxy) cin-namic acid and 4-phenoxy cinnamic acid-via a Knövenagel-Döbner condensation using piperidine and glacial acetic acid as catalyst and solvent, respectively [35] [51]. The other cinnamic acid analogs (cinnamic acid, 4-nitro cinnamic acid, 3,4-dichloro cinnamic acid, 4-methoxy cinnamic acid, and 4-methyl cinnamic acid) were also synthesized, onlyphenylacetic acid was purchased from Sigma Aldrich Co.…”

Ultrasound‐enhanced Green Synthesis of 5,5‐Diphenylhydantoin Derivatives Using Symmetrical or Unsymmetrical Benzils

“…The notable features of the ultrasound approach are enhanced reaction rates, formation of pure products in high yields, easy manipulation and considered processing aid in terms of energy conservation and waste minimization compared with traditional methods and this technique is more convenient to take green chemistry concepts into accounts. [14][15][16] In this work, we wish to report a rapid and efficient synthesis of 5,5-diphenylhydantoins using ultrasound irradiation.…”