Papers by Keyword: Coupling Reactions

Abstract: In synthetic organic chemistry, use of catalyst to accelerate the rate of reaction leading to high yield product is a common approach practiced by chemists. Numerous homogenous and heterogenous catalyst are widely used in chemical reactions, particularly metal based catalyst are widely used. The properties of metals and their oxides are fine-tuned by size reduction method bringing down to nano scale. Further hybrid materials are used for more specific applications among which metal organic frame works are listed in more number in last ten years. Herein this review focuses on use of metal organic framework in particular Copper metal based organic framework (Cu-MOF). Cu-MOF synthesis, properties and their applications are discussed. A detailed discussion on the use of Cu-MOF as a heterogeneous catalyst in various organic reactions.

Abstract: In order to prepare new functional macromolecule material, the coupling reaction of acenaphthene catalyzed by [Bmim]Cl/FeCl3 ionic liquid was investigated under mild reaction conditions and without any additional organic solvent. Pure 3,3’-biacenaphthene, which is used as intermediate of function aromatic polymer material, was obtained by recrystalling and column chromatography from the reaction mixture and was determined by GC/MS, 1HNMR and FTIR analysis. The influence of various reaction conditions on the coupling reaction of acenaphthene were studied by GC analysis and the optimum synthesis conditions of the reaction were obtain. Under optimun conditions, the yield of 3,3’-biacenaphthene will be 63.5 % and selectivity of that will be 85.6 %. Further more, [Bmim]Cl/FeCl3 is environmentally benign catalyst and solvent and can be reused.

Abstract: New functional polymeric, semiconducting materials were synthesized by chemical oxidative polymerization of acriflavine hydrochloride in aqueous solution at room temperature, using ammonium peroxydisulfate as an oxidant. Polymerization products were characterized by gelpermeation chromatography (GPC), FTIR spectroscopy, scanning electron microscopy (SEM) and conductivity measurements. The influence of the oxidant/monomer molar ratio on the molecular structure, molecular weight distribution and the electrical conductivity of polyacriflavines was studied. Molecular weights approach a maximum value of ~20000. The polyacriflavine prepared by using oxidant/monomer molar ratio 1.25 shows the conductivity of 2.8 × 10–7 S cm–1. New substitution pattern shown by FTIR spectroscopic analysis combined with MNDO-PM3 semiempirical quantum chemical calculations revealed N─C2 coupling reactions as dominant. The formation of phenazine rings in ladder structured polymerization products was observed by FTIR spectroscopy. The existence of a certain polyacriflavine crystalline structure was suggested from the SEM micrographs.