Synthesis And Structures Of Di(Imido)amido Organometallic Compounds

Amidinate complexs is one of the important branches in organo -metallic chemistry,and the research about the ligands containg imine which can be applied as catalysts and materials in organic synthesis,olefin polymerization,ring-opening polymerization for lactide,pharmaceuticals industry and engineering plastics.The purpose of this thesis is on the synthesis and characterization of organometallic complexes and their application in initiating the ring-opening polymerization(ROP) of lactide to prepare polylactide.A bridge diimine ligand N,N'-bis(1-phenyl-ethylidene)ethane-1,2-diamine was synthesized from the reaction of 1-phenyl-ethanone and ethylenediamine,and then a series of organometallic compounds were obtained by some classic synthetic methods.We try to use the synthesized organometallic compounds for ring-opening polymerization(ROP) of lactide.The details are listed as following:Chapter 1.The background of the research work was introduced.It is divided into two sections:(â…°)Synthesis,characterization and application as catalyst of amido-metal complexes and the works of M.F.Lappert and D-S Liu;(â…±)Synthesis,characterization and application in the ROP of lactide.Chapter 2.Introduce the synthesis and structure of bridge diimine ligands and diimino-metal complexes.Schiff's base N,N'-bis (1-phenyl-ethylidene)ethane-1,2-diamine was synthesized from the reaction of 1-phenyl-ethanone and ethylenediamine,which was deprotoned by LDA and then reacted with metallic halide,and a series of novel bridge diimino-metal complexes were synthesized.Their structures were characterized by ¹H-NMR,¹³C-NMR,elemental analysis and X-Ray diffraction technology.Chapter 3.Synthesis and structure of bridgeβ-diimino and β-diketiminate ligands.N,N'-bis(1-phenyl-ethylidene)ethane-1,2-diamine which was deprotoned by LDA and then(â…°)reacted with nitrile which have noα-H(â…±)reacted with synthesized imide chloride,and try to get a series ofβ-diimino andβ-diketiminate ligands.