H₂O₂in WEB: a highly efficient catalyst system for the Dakin reaction

Abstract

Without using any transition metal catalyst, ligand, base, toxic or hazardous reagent, additives/promoters and organic solvent, Dakin reactions have been successfully carried out by using H2O2 in neat ‘Water Extract of Banana’ (WEB) at room temperature under aerobic conditions in very short reaction times.

Ru (III) Schiff‐base complex anchored on nanosilica as an efficient and retrievable catalyst for hydration of nitriles

“…As the presence of base is essential for the hydration of p ‐bromo benzonitrile, we have examined the reaction with various bases such as KOH, Na 2 CO 3 , Et 3 N, water extract of banana peel ash (WEB) [supporting information], NaHCO 3 , NaOH and K 2 CO 3 (Table ). On investigation it is observed that 2 mmol of KOH exhibited best result at 40 ° C in 5 hr (Table , Entry 10).…”

Water hyacinth ash: an efficient green catalyst for the synthesis of β-amino carbonyl/nitrile compounds by aza-Michael reaction at room temperature

“…Recently, the water extracts of various agro-waste ashes have been successfully employed as green and nonconventional solvent or as green catalysts in a number of organic reactions viz. Suzuki-Miyaura [1][2][3][4][5][6][7] and Sonogashira cross-coupling [8,9], Dakin reaction [10], ipso-hydroxylation of arylboronic acid [11], Knoevenagel reaction [12], Henry reaction [13], 3-carboxycoumarins synthesis [14], peptide bond synthesis [15], etc. Additionally, many researchers have reported the ash based heterogeneous catalysts derived from different agricultural wastes as the promising green catalysts for biodiesel production.…”

A Green Protocol for the Synthesis of α‐Diazo‐β‐hydroxyesters and One‐Pot Conversion to β‐Keto‐Esters and Imidazo[1,2‐a]pyridine‐3‐carboxylates

“…Various Pd‐catalyzed reactions viz. Suzuki‐Miyaura and Sonogashira coupling, popular name reactions (for example Dakin and Henry reaction) and other organic synthesis such as peptide synthesis, azidation of aromatics and synthesis of 3‐carboxycoumarins have been successfully performed in this green reaction medium. Although WEB can be used alone, in some cases it has been mixed with organic solvents like ethanol and iso ‐propanol to increase the miscibility of reagents and starting materials so that the reactions furnish higher yields of the products .…”