Pdnp and Pd containing trimetallic nanoparticles (tnp) are synthesized by chemical method with cetyltrimethylammonium bromide as the capping agent. Compositionally, four different tnp are prepared and the particle sizes are characterized by UV-vis spectra, HR-TEM, and XRD measurements. The catalytic activities of Pdnp and tnp are tested using the Sonogashira C-C coupling reaction. The product yield and recyclability of the recovered catalysts are studied. tnp (1:1:1) exhibited better catalysis than Pdnp, which may be due to the concerted electronic effects of the Au-Ag core onto the Pd shell atoms.

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The chalcones 1‐(2′‐hydroxy‐aryl)‐3‐(1‐indol‐3‐yl)‐prop‐2‐en‐1‐one (3) and 1‐(2′‐hydroxy‐aryl)‐3‐(2‐chloroquinolin‐3‐yl)‐prop‐2‐en‐1‐one (6) were synthesised by piperidine mediated condensation of an ethanolic solution of an o‐hydroxyacetophenone (1) with corresponding heteroaryl‐3‐carboxaldehyde. The structures have been established on the basis of elemental (C, H, N) analysis, UV, IR, 1H NMR spectral data. The compounds 3 and 6 were screened for antimicrobial activities against a variety of bacterial agents. J. Heterocyclic Chem., 2010.

The biological activity of flavone has been enhanced by introducing heteroaryl moiety in C-2 position of chromone derivatives. Thus, 2-(1H-Indol-3-yl)-4H-chromen-4-one derivatives (6a-e) and 2-(2chloroquinolin-3-yl)-4H-chromen-4-one derivatives (7a-e) were synthesized from corresponding chalcone. They were structurally confirmed by analytical and spectral data and evaluated for their antimicrobial activities. The results showed that this skeletal framework exhibited marked potency as antimicrobial agents.