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1、09级化学类演讲人：贾会友制作者：刘月宇Theme：ApplicationofTinandNanometerTininAllylationofCarbonylCompoundsinTapWaterAsweallknowchemicalpollutionisglobalproblem，Howtoreducingchemicalpollution？IntroductionWiththedevelopmentofindustrialization,organicchemistshavebeenconfrontedwithanewchallengeoffindingnovelmethodsino
2、rganicsynthesisthatcanreduceandfinallyeliminatetheimpactofvolatileorganicsolventsandhazardoustoxicchemicalsontheenvironment.So,usingaqueousmediatoperformorganicreactionshasattractedconsiderableinterestrecentlybecausewaterisconsideredtobeasafeandenvironmentallybenignsolventThefirstofexperimentstep
3、Firstly,toinitiatetheexperiment,amixtureofbenzaldehyde,allylbromide,andthemetalpowderin3mLofdistilledortapwaterwithoutanycoreagentorcosolventwasstirredatroomtemperature.ThesecondofexperimentstepAfterabout24h,thereactionwasmonitoredbyTLC,andthereactionmixturewasextractedwithether;subsequently,thee
4、therextractwaswashedwithwateranddriedwithmagnesiumsulfateThethirdofexperimentstepAfterremovalofthesolvent,thecrudeproductwasobtained.Theyieldoftheallylationproductwasmeasuredby1HNMRThemetalsusedvariedfromFetoSn,andthereactionresultsarelistedinTable1.Thisstudydemonstratedthattheunusualphenomenonof
5、nanometertin-mediatedallylationwascausedbypropertiesofnanometertinparticles.Thesmallertheradiusoftinnanometerparticles,thegreatertheratioofsurfacetovolume,whichleadstoalargeincreaseofatomsonthesurfaceandanabundanceofsuspendedandunsaturatedbondsandsoon,affectedbytheunsaturatedcoordination.Allthese
6、makethesurfaceofthetinnanometerparticlemoreactiveandenhancethereactionselectivity.Whatismore,replacingthedistilledwaterwithtapwaterhadnoinfluenceontheallylations.Ourworkshowedusthatsubstantialprogresscouldbemadeinorganicreactionsinwater,whichhavegreatpotentialinreducingchemicalpollution.Whatismor
7、e,replacingthedistilledwaterwithtapwaterhadnoinfluenceontheallylations,itsupplyawaytodotheorganicexperimentinthewaterConclusionInconclusion,theresultdemonstratedthatanefficientandcleansynthesisforallylationindistilledo
