IN RECENT YEARS, PALLADIUM CATALYZED C-C BOUND FORMATION HAS BEEN EVOLVED INTO A GENERAL TECHNIQUE FOR coupling DIFFERENT SUBSTRATES UNDER VARIOUS CONDITIONS. ON THE OTHER HAND, CYCLOPALLADATED COMPLEXES AS AN IMPORTANT MATERIAL IN INORGANIC CHEMISTRY PLAY IMPORTANT ROLE IN DIVERSE FIELDS OF STUDY ESPECIALLY IN coupling reactions [1, 2]. HOMOGENEOUS PALLADIUM NANO CATALYST HAVE HIGHER REACTION RATE THAN HETEROGENEOUS BUT THERE ARE SOME PROBLEMS CONCERNING WITH THESE CATALYST SUCH AS NEED OF HIGH PRICE LIGANDS, SEPARATION FROM REACTION MIXTURE AND REUSE OF EXPENSIVE METAL CATALYST.IN THIS STUDY A PVP-SUPPORTED PALLADIUM NANO-CATALYST IS PREPARED AND CHARACTERIZED BY SCANNING ELECTRON MICROSCOPY (SEM), TRANSITION ELECTRON MICROSCOPY (TEM) AND X-RAY DIFFRACTION (XRD) TECHNIQUES. PALLADIUM NANOPARTICLES SUPPORTED ON PVP WAS USED AS AN EFFICIENT CATALYST IN THE SUZUKI Cross-coupling reactions OF PHENYL BRONIC ACID WITH ARYL HALIDES (SCHEME 1). OPTIMUM CONDITION FOR SUZUKI REACTION WAS EVALUATED BY VARIOUS TEMPERATURES, DURATION OF REACTION, AND KIND OF BASE, SOLVENT AND AMOUNT OF CATALYST. ALL reactions WERE MONITORED BY GC AND GENERALLY GAVE HIGH YIELD OF COUPLED PRODUCTS.

IN RECENT YEARS, THE HECK AND SUZUKI reactions HAVE FOUND WIDESPREAD APPLICATIONS IN SYNTHETIC ORGANIC CHEMISTRY AND MATERIALS SCIENCE [1]. THEIR POPULARITY STEMS IN PART FROM THEIR TOLERANCE OF MANY FUNCTIONAL GROUPS, WHICH ALLOWS THEM TO BE EMPLOYED IN THE SYNTHESIS OF HIGHLY COMPLEX MOLECULES [2]. THE PALLADIUM-CATALYZED SUZUKI AND HECK Cross-coupling reactions ARE POWERFUL TOOLS FOR THE PREPARATION, RESPECTIVELY, OF UNSYMMETRICAL BIARYL [3] AND STILBENE COMPOUNDS WHICH HAVE BEEN APPLIED TO MANY AREAS, INCLUDING HERBICIDES AND NATURAL PRODUCT SYNTHESIS [4]. IN THIS STUDY DENDRONIZED POLYSTYRENES WERE OBTAINED BY MODIFICATION OF POLY(STYRENE-CO-CHLOROMETHYLSTYRENE) PRECURSORS WITH LIC(SIME2CH=CH2)3 PALLADIUM WAS ATTACHED TO THE POLYMERS VIA COORDINATION TO VINYL GROUPS LOCATED ON CARBOSILANE MOIETIES AND USED IN SUZUKI Cross-coupling reactions. THE STRUCTURES OF ALL NEW COMPOUNDS HAVE BEEN ELUCIDATED BY A COMBINATION OF NMR SPECTROSCOPY, IR SPECTROSCOPY AND ELEMENTAL ANALYSIS.

THE RECENT DEVELOPMENT IN Cross-coupling reactions USINGTRANSITION-METAL-CATALYSIS AFFORDS EFFECTIVE METHODS FOR THE FORMATIONOF ARYLCARBON-HETEROATOM BONDS [1] BENZIMIDAZOLES AND BENZOXAZOLES ARE IMPORTANT SUBUNITS OF MANY COMPOUNDS AND ARE OF BIOLOGICAL AND PHARMACEUTICAL INTEREST. [2] FOREXAMPLES, BENZIMIDAZOLE AND BENZOXAZOLE CORE STRUCTURES CAN BEFOUND IN COMMERCIAL DRUGS SUCH AS PRILOSEC, NEXIUM, PROTONIX, FAMVIR, VERMOX AND PRIAXIM.AMONG TRANSITION-METALS, COBALT IS SUFFICIENT CATALYST FOR Cross-couplingS BECAUSE IS AVAILABLE, INEXPENSIVE, NON-TOXIC AND EXHIBITS HIGH CATALYTIC ACTIVITIES. ARYL CARBONHETEROATOM Cross-couplingS BY COBALT ARE RARE AND ONLY TWO REPORTS ARE AVAILABLE.COBALT NANOSTRUCTURE HAS BEEN SYNTHESIZED BY NEW EFFICIENT METHODAND USED TO SYNTHESIS BEZIMIDAZOLE AND BENZOXAZOLE AS IMPORTANT HETEROCYCLIC COMPOUNDS. THESE SYNTHESES CONTAIN CARBON-HETEROATOM Cross coupling IN IONIC LIQUID MEDIUM.

ORGANIC SULFIDES ARE IMPORTANT COMPOUNDS WHICH WIDELY EXIST IN MANY BIOLOGICALLY AND PHARMACEUTICALLY ACTIVE MOLECULES. ESPECIALLY UNSYMMETRICAL SULFIDES MOIETIES HAVE BEEN USED IN THE TREATMENT DISEASES SUCH AS PARKINSON, S, ALZHEIMER, S, IMMUNE AND INFLAMMATORY, DIABETES, HIV. ...