Preyssler catalyst, [NaP5W30O110]14−: A green, efficient and reusable catalyst for esterification of salicylic acid with aliphatic and benzylic alcohols

DABCO as an efficient catalyst for the synthesis of 3-cyano-2(1H)-pyridinones and their 2-imino analogues

“…Furthermore, it was used to catalyze the coupling of α-ketoesters with acrylonitrile [13] and for the dimerization of α, β-unsaturated ketones and nitriles [14]. In connection with our recent interest aimed at the development of efficient protocols for the preparation of biological active heterocycles [15][16][17][18], herein, we selected DABCO as a catalyst to synthesis of 3-cyano-pyridines. The reaction of various aldehydes, 3,4-dimethoxyacetophenone, ammonium acetate and ethyl cyanoacetate or malononitrile in the presence of DABCO in ethanol afforded 4-alkyl(aryl)-3-cyano-2(1H)-iminopyridines and 2(1H)-pyridinones in good yields ( Table 1).…”

Sodium Silicate-catalyzed Multicomponent Synthesis of Pyridine Dicarbonitriles

“…In connection with our recent interested aimed at the development of efficient protocols for the preparation of biological active heterocycles, [15][16][17][18] herein, we selected Sodium silicate as a new catalyst to synthesis of pyridine dicarbonitriles. The reaction of various aldehydes, 4-methyl thiophenol, malononitrile in the presence of Sodium silicate in ethanol afforded pyridine dicarbonitriles at room temperature in good yields (Table 1).…”

H14[NaP5W30O110] as a Heterogeneous Recyclable Catalyst for the Air Oxidation of Thiols Under Solvent Free Conditions

“…This heteropolyacid nevertheless has important advantages such as: strong Bronsted acidity with 14 acidic protons, high thermal stability, high hydrolytic stability (pH 0-12), reusability, safety, low quantity of waste, separability, low corrosiveness, high oxidation potential and general "greenness", along with an exclusive structure, which have attracted much attention on this catalyst. [8], as shown schematically in Figure 1. Recently we have explored the application of Preyssler catalyst in various organic reactions [8][9][10][11][12][13][14].…”

“…[8], as shown schematically in Figure 1. Recently we have explored the application of Preyssler catalyst in various organic reactions [8][9][10][11][12][13][14]. This paper reports the results of the oxidation of thiols to disulfides utilizing [NaP 5 W 30 O 110 ]…”