Catalytic Activity of Manganese Oxide Anchored on to Alumina and Zirconia for the Synthesis of Dihydropyrimidinones: Role of Acidity, Crystal Phase and Morphology

Title:Catalytic Activity of Manganese Oxide Anchored on to Alumina and Zirconia for the Synthesis of Dihydropyrimidinones: Role of Acidity, Crystal Phase and Morphology

Volume: 3 Issue: 1

Author(s): Mahadevaiah Rekha, Hagalahalli N. Hareesh, Nagaraju Kathyayini and Narasimaiah Nagaraju

Affiliation:

Keywords: Biginelli reaction, dihydropyrimidinones, manganese oxide on alumina/zirconia, role of acidity, solvent free synthesis.

Abstract: Manganese oxide supported on alumina and zirconia has been prepared by precipitation-impregnation method. The materials have been characterized by FT-IR, P-XRD, BET, TPD-NH₃, TGA, SEM and TEM techniques for their textural properties. The catalytic activity of these materials has been explored in the synthesis of dihydropyrimidinones via.,Biginelli reaction. A rod like morphology is observed for zirconia containing 5% manganese oxide. These materials exhibited good catalytic activity in terms of isolated yield (>97%) and selectivity (100%) for the synthesis of dihydropyrimidinones. Acidity of the catalysts and the tetragonal phase of zirconia were found to play an important role in catalyzing this reaction. The catalyst with 5%Mn/ZrO₂ exhibited distinctly different catalytic activity. The catalyst is reusable without losing its activity upto 5 cycles.

Cite this article as:

Rekha Mahadevaiah, Hareesh N. Hagalahalli, Kathyayini Nagaraju and Nagaraju Narasimaiah, Catalytic Activity of Manganese Oxide Anchored on to Alumina and Zirconia for the Synthesis of Dihydropyrimidinones: Role of Acidity, Crystal Phase and Morphology, Current Catalysis 2014; 3 (1) . https://dx.doi.org/10.2174/2211544703999140130115808