ZnO nanoparticles as a worthwhile and recyclable catalyst have been used for the one-pot synthesis of 1,8-dioxo-decahydroacridines and 1,8-dioxooctahydro-xanthenes via multi-component reactions under solvent-free conditions. The presented method is mild, environmentally friendly, inexpensive and highly effective to give the products in good to excellent yields.
Biodegradable ZnO nanoparticles with excellent biocompatibility prepared via a biogenic process have great potential as therapeutic agent-cum-drug carriers for cancer treatment.
Aim and Objectives:
The focus of the present work is to synthesize ZnO/C composite using dextrose as carbon source by
combustion method and study the comparative evaluation on one-pot synthesis of β-acetamido- β-(phenyl) propiophenone
over ZnO nanoparticles and ZnO/C composite catalyst.
Materials and Methods:
The ZnO nanoparticles has been synthesized by sol-gel method using zinc nitrate and NaOH and
ZnO/Carbon composites by combustion method using zinc nitrate and dextrose as carbon source. The resulting gel was
placed in a preheated muffle furnace at 400o
C. The solution boils and ignites with a flame. On cooling highly amorphous
powder of ZnO/Carbon composite is obtained.
Results:
The XRD patterns reveal the hexagonal phase with Wurtzite structure and the nanocrystalline nature of the
catalysts. The SEM image of ZnO/C composite showed that it contains spherical particles with an average size of 41 nm.
The average particle size of the composite was around 60nm by DLS method. The catalytic activity of the ZnO/Carbon
composites has been analyzed by one-pot four-component condensation of benzaldehyde, acetophenone, acetyl chloride and
acetonitrile. The feed molar ratio of 1:1 (Bz:AP) and catalyst loading of 30 mol% is found to be the optimal condition for βacetamido ketone conversion over ZnO/carbon composite.
Conclusion:
The substantial catalytic activity of the synthesized ZnO/C composite materials was tested by one-pot fourcomponent condensation of benzaldehyde (Bz), acetophenone (AP), acetyl chloride (AC) and acetonitrile (AN) which
showed a high β-acetamido ketone conversion under the optimized reaction conditions. It has also been found that the
catalyst is very stable and reusable.
ZnO Nanoparticles: A Highly Effective and Readily Recyclable Catalyst for the One-Pot Synthesis of 1,8-dioxo-decahydroacridine and 1,8-dioxooctahydro-xanthene Derivatives