Synthesis And Catalytic Performance Of Novel Dinuclear Salen Metal Complexes

The catalyst is widely used,and salen-metal(N,N-bis(salicylidine)ethylenediamine)is an important one,which is of great significance in biological catalysis,drug synthesis and other fields.Olefins and their derivatives and sulfide are two common industrial raw materials,and olefin epoxide and sulfoxide derivatives are important intermediates in organic synthesis,has a huge economic benefit,therefore,their synthesis has been widespread attention.Salen-metal complexes have good catalytic activity in both olefin and thioether,and are widely used in various catalytic reactions.But salen-metal complexes are mostly mononuclear metal complexes and their corresponding non-homogeneous morphology.Similar to its structure,the design of dual-core salen-metal complexes with more active sites is less,which is to be further explored.This paper is devoted to the synthesis of a class of unreported dimeric Mn(salen),which is prepared by the modification of ligands,and the dimeric Mn(salen)which is substituted by tert-butyl which has not been reported.A series of studies were carried out on the reaction of phenylethylene oxide by selective oxidation of styrene and phenylmethyl sulfone.The oxidation catalytic performance of two types of dimeric Mn(salen)was systematically investigated.The specific research contents are as follows:A dimeric salen ligand was prepared by the condensation reaction of salicylic aldehyde and phenylethylamine,and then manganese acetate and lithium chloride were added to prepare the binuclear Mn(salen)complexes.The structure of complexes was characterized by FT-IR,UV-vis,XPS and MS.Results show that the dimeric Mn(salen)complexes,dimeric salen ligands and the center of the acetic acid manganese manganese ion complexing success,dimeric Mn(salen)complexes of manganese in the valence state of trivalent,forming the structure of a typical Mn(salen)complexes.In the presence of sodium hypochlorite,4-phenyl pyridine nitrogen oxides(PPNO)as the axial help push agent,selective oxidation of styrene to produce styrene epoxide reaction for the model,system explores the dimeric Mn(salen)complexes and their catalytic properties of the type of catalyst,the dosage of catalyst,sodium hypochlorite and styrene mole ratio,axial PPNO help push agent dosage,reaction temperature,solvent and reaction time factors affect the performance of catalyst,and to give a reasonable explanation.A dimeric salen ligand was prepared by using tert-butyl salicylic aldehyde andphenylethylamine condensation reaction,and then another kind of dimeric Mn(salen)complex was prepared by adding manganese acetate and lithium chloride.The structure of complexes was characterized by FT-IR,UV-vis,XPS and MS.Results showed that: in the tertiary butyl replace dimeric Mn(salen)complexes,the dimeric salen ligands and manganese acetate were successful,and the valence state of manganese in the dimeric Mn(salen)complexes was three,forming a typical structure of Mn(salen)complexes.In the presence of hydrogen peroxide to benzene methyl sulfide oxidation produce benzene methyl sulfoxide as model reaction,the system of tertiary butyl replace dimeric Mn(salen)catalytic oxidation properties of complexes,the dosage of the catalyst,the type of catalyst,hydrogen peroxide and sulfur benzoic ether mole ratio,reaction temperature,solvent and reaction time factors affect the performance of catalyst,and to give a reasonable explanation.