Research On New Dual-Core Transition Metal Complexes Synthesis And Catalytic Properties

In synthetic organic chemistry, Heck reaction is an important class of formation of new C-C bond and halogenated aromatic compounds synthesis of alkenyl. In recent years, Heck coupling reaction has been a hot topic and has achieved great development catalytic chemistry and synthetic organic chemistry. Since the 1970s, Heck reaction was discovered, after decades of research and development have become important methods to synthetic olefin arylation and alkenyl. It is widely used in medicine, natural products, synthetic light-emitting materials, fuel and other materials in many applications. Various substituted olefins and other unsaturated hydrocarbons were used in the synthesis of new materials for the development of low-carbon economy and had provided a broad space for development. Heck coupling reaction requires relatively mild reaction conditions, palladium metal catalysts commonly used as a coupling reaction catalyst, its catalytic activity greatly influenced by the environment and the ligand. The change in the structure of the ligand, usually cause a change in steric hindrance and electronic effect thus affect the catalytic efficiency of the catalyst. In order to improve the catalytic activity, organophosphorus ligand has been extensive development and research. But organophosphorus ligand relatively lively unstable and have greater toxicity. So, it is not an ideal ligand. N, N- α-bidentate diimine palladium complexes as catalysts have good stability, activity and low toxicity, has been extensive research and development.This article has been pyrene -4,5,9,10- tetraone and small hindered aromatic amines (2,6-dimethylaniline,2,6-diethylaniline,2,4,6-trimethylaniline,2,6-diethyl-4-methylani-line) as a raw material. Under N2 protection, first small sterically hindered aromatic amines and triethylamine were dissolved in toluene, then added into 250mL double-necked flask in an oil bath and heated to 90℃, followed by dropwise addition a certain amount of TiCl4, a rear white smoke appears, then addition of pyrene -4,5,9,10-four ketone was added. Reacted for 30 minutes, to give N, N- α-bidentate diimine ligands (L1-L4). Ligands (L1-L4) and PdCl2(CH3CN)2 in shclenk tube use dichloromethane as solvent to stir at room temperature can obtained pyrene -4,5,9,10-four imine-(aromatic amines) combined chloride palladium complex (Pd1-Pd4).In this thesis, the palladium catalyst synthesized by the catalytic activity of the Heck reaction carried out a systematic study and discussion, discovery, pyrene -4,5,9,10- four imine-(aromatic amines) palladium chloride catalysts in the Heck reaction exhibit excellent catalytic activity and thermal stability. Under optimum reaction conditions use Pd2 as catalyst the bromobenzene conversion rate of 98%. Meanwhile, the catalyst for the halide-containing electron-withdrawing group-containing vinyl halide and catalytic reaction with styrene have a certain activity, for the synthesis of complex composite provides a potential pathway.In order to Looking for a effective catalyst for olefin polymerization, a series of 3,8-bis (arylanimine)-2,9-aza phenanthroline nickelbromide was synthesized and all compounds were characterized detaily to confirm the structure. Under Methylaluminoxane (MAO) and di-methyl-aluminum (Me2AlCl) chloride in the presence as co-catalyst, to carry out olefin polymerization catalytic experiments. All of the catalyst exhibited higher catalytic activity during the ethylene oligomerization. we were research the reaction conditions such as co-catalyst, temperature, pressure and discussed the experimental results.