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Current Catalysis

Editor-in-Chief

ISSN (Print): 2211-5447
ISSN (Online): 2211-5455

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

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

Volume 3, Issue 1, 2014

Page: [88 - 102] Pages: 15

DOI: 10.2174/2211544703999140130115808

Price: $65

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.

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


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