Silicotungstic Acid Modified Bentonite: An Efficient Catalyst for Synthesis of Acetal Derivatives of Aldehydes and Ketones

Abstract

Acetals and ketals are among the important materials of organic synthesis and as protecting agent of carbonyl functionality. A milder, efficient and green synthesis of acetals and ketals has been developed using Silicotungstic acid modified Bentonite (STA-Ben) as a catalyst. STA-Ben has been synthesized and characterized by various analytical techniques. It has been found to be an efficient and reusable catalyst for the synthesis of acetyl derivatives in excellent yields. In order to elucidate the efficiency of the STA-Ben as catalyst, reaction has also been performed using various catalysts. The reaction conditions (time and amount of catalyst) have been optimized using various catalysts. The products of the various reactions have been characterized by FT-IR, NMR.

Tungsten-substituted molybdophosphoric acid impregnated with kaolin: effective catalysts for the synthesis of 3,4-dihydropyrimidin-2(1H)-ones via biginelli reaction

“…), x is its oxidation state, and M is the metal ion (Mo 6+ or W 6+ ). [5][6][7] The M 6+ ions can be replaced by many other metal ions, e.g., V 5+ , Co 2+ , Zn 2+ , Ni 2+ etc. [8][9][10][11][12] The Keggin anion is composed of a central tetrahedral XO 4 surrounded by 12 edge and corner sharing metal-oxygen octahedra MO 6 .…”