预览加载中，请您耐心等待几秒...

Salalen-Co配合物催化环己烯环氧化研究.docx

预览
1/2
2/2

在线预览结束，喜欢就下载吧，查找使用更方便

下载提示 文本预览

如果您无法下载资料，请参考说明：

1、部分资料下载需要金币，请确保您的账户上有足够的金币

2、已购买过的文档，再次下载不重复扣费

3、资料包下载后请先用软件解压，在使用对应软件打开

Salalen-Co配合物催化环己烯环氧化研究 Salen-Co(Salalen-Co)complexeshaveattractedconsiderableattentionaseffectivecatalystsfortheepoxidationofcyclohexene.ThisresearchaimstoinvestigatethecatalyticactivityofSalalen-Cocomplexesintheepoxidationofcyclohexeneandprovideinsightintothemechanismofthisreaction. 1.Introduction Cyclohexeneisanimportantintermediateinthesynthesisofvariouschemicals,andtheselectiveepoxidationofcyclohexenetocyclohexeneoxideisacrucialtransformationinmanyindustrialprocesses.Traditionally,theepoxidationofcyclohexenehasreliedontheuseoftoxicandenvironmentallyharmfulreagentssuchasm-chloroperoxybenzoicacid(m-CPBA).Therefore,thedevelopmentofefficientandenvironmentallyfriendlycatalystsforthistransformationishighlydesirable. 2.Salalen-CoCatalysts Salalen-Cocomplexesareaclassofchiralligand-basedcatalyststhatexhibitexcellentcatalyticactivityinvariousorganictransformations.TheSalalenligandconsistsofatetradentatescaffoldwithtwoalkylsubstituentsandtwophenolgroups.Thecentralcobaltatomprovidescoordinationwiththeligand,formingtheSalalen-Cocomplex. 3.CatalyticActivityofSalalen-CoComplexes NumerousstudieshavereportedtheefficientcatalyticactivityofSalalen-Cocomplexesintheepoxidationofcyclohexene.ThesecomplexescanactivatemolecularoxygenandfacilitateitsinsertionintotheC=Cbondofcyclohexene,leadingtotheformationofcyclohexeneoxide.ThecatalyticactivityofSalalen-Cocomplexescanbetunedbymodifyingtheligandstructureandthesubstituentsonthecobaltcenter. 4.MechanismofEpoxidation TheexactmechanismofepoxidationcatalyzedbySalalen-Cocomplexesisstillunderinvestigation.However,theproposedmechanisminvolvestheactivationofoxygenbythecobaltcentertogenerateCo(V)-oxointermediates,whichtheninsertintotheC=Cbondofcyclohexenetoformtheepoxide.Theregeneratedcobaltcatalystcanparticipateinsubsequentcatalyticcycles. 5.FactorsInfluencingtheCatalyticActivity VariousfactorscaninfluencethecatalyticactivityofSalalen-Cocomplexesintheepoxidationofcyclohexene.Thesefactorsincludeligandstructure,solventchoice,temperature,andreacta