简介:Wehavesuccessfullysynthesized1-(2′-Phenyl)cycloproply1-2,3-epoxypropan-1-ol3,whichwillbeappliedtothekineticsstudyofoxiranylcarbinylradical.
简介:多代替的dihydrofurans是为自然产品和药品的合成的珍贵中介。可观的注意集中于发展有效并且为他们的准备的regioselective方法。把K2CO3用作一个底,与fur-2-oylmethyltriphenylarsonium溴化物1的反应和乙醇2-acetyl-3-arylacrylate2在在房间温度的tetrahydrofuran,我们发现一个有效协议被完成综合trans-3-aryl-4-carbethoxy-2,3-dihydro-2-fur-2-oyl-5-methylfurans3在有高stereoselectivity的好产量。化合物3的结构被红外,1HNMR,MS和HRMS证实。为3的形成的机制被建议。
简介:Treatmentof4-amino-3-(1-aryl-5-methyl-1,2,3-triazol-4-yl)-5-mercapto-1,2,4-triazoles/2-amino-5-(1-aryl-5-methyl-1,2,3-triazole-4-yl)-1,3,4-thiadiazoleswithbenzaldehyde,acetoneandω-bromoacetophenonewastestedandcompared.ThetitlecompoundsSchiffbases,amides,imidazolo[2,1-b]-1,3,4-thiadiazolesand7H-s-triazolo[3,4-b]-1,3,4-thiadiazineshavebeenconfirmedbyelementalanalyses,^1HNMR,IRandMSspectra.AllthecompoundshavealsobeenscreenedfortheirantibacterialactivitiesagainstB.subtilis,S.aureusandE.coli.
简介:Thioglycolicacid(TGA)-stabilizedCdTenanocrystals(NCs)werepreparedwithsodiumtelluriteastelluriumsource,whichavoidsthecumbersomeprocessesassociatedwithH2TeorNaHTesources.FluorescentCdTe/SiO2compositesweresynthesizedbyasol-gelmethodwithouttheexchangeofsurfaceligands.ThephasestructureofCdTeNCswasinvestigatedbyX-raydiffractometry.Forcomparison,somecharacterizationsweredoneforboththeCdTeNCsandthecomposites.CdTeNCsandCdTe/SiO2compositeswerecharacterizedwithTEM,digitalcameraandfluorescencespectrophotometer.ThestabilityofCdTeNCsandthecompositeswereinvestigatedinphosphate-bufferedsaline(PBS)bufferandthefluorescentpropertiesofthecompositeswerediscussedindetail.
简介:ThephotodegradationreactionrateofCHCl3inTiO2particulatesuspensionwasimperovedsignificantlybyHCl-treatment.TheeffectofHCl-treatmentonthephotocatalyticactivityofTiO2wasstrdiedinaPECcellbyusingIntensity-ModulatedPhotocurrentSpectroscopy(IMPS).ThemagntudeofphotocurrentresponseandthecharacteristicfrequenciesoftheupperandlowersemicirclesinthecomplexplaneofIMPSresponsewereanalyzed,andtheccathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.Theincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesofphotogeneratedholesandelectronswerediscussed.TheincreasesinthecathodicandanodicphotocurrentresponseandinthetimeconstantsofbothcathodicandanodicreactionprocessesindicatethatHCl-treatmentleadstotheimprovementofthephotocatalyticactivityofTiO2andachangeofthephotocatalytickineticmechanism.
简介:2-Oxoderivativesofglycosides,called2-ketoglycosidesorglycoside2-uloses,arebiologicallyimportantincarbohydratemetabolismandareveryusefulinsynthesisofbranched-chainsugarsandaminosugars.Verylittleisknownoftheirchemistrybecauseofthehighsusceptibilityofthesecompoundstodegradationinsolution,andinparticulartheirinstabilitytobase.Thusitisimportanttostudythereactivitiesof2-ketoglycosides.Inapreviouspaper,wereportedthetransformationof2-ketoglycosidesinpyridinesolution.Duringthetransformationof2-and3-ketoglycosides,ademethoxylationreactionoftheenolintermediatewasshowntotakeplacesimultaneouslywitheliminationtogivehex-1-enopyran-3-ulose.
简介:Thecomplexes(PhCH2)2Sn(MBT)2(2)and(PhCH2)3Sn(MBT)(3)(HMBT:2-mercaptobenzothiazole)havebeensynthesizedandcharacterizedbyelementalanalyses,andIR,^1H,^13C,^119SnN-MRspectrometriesandX-raydiffraction.Studiesonthecrystalstructuresof2and3showthatHMBTactsasbidentateligandthroughchelationofNandSatoms.Complex2containsasix-coordinatetinatomwiththeaxialangleC(15)-Sn(1)-C(22)129.6(2)°.Andthetinenvironmentofcomplex3isadistortedcis-trigonalbipyramidwithC(8)-Sn(1)-N(1)158.80°.
简介:hePhotocatalyticcharacterizationofTiO2supportedonactivecarbonwasinvestigatedforphotocatalyticdecompositionofdichloroaceticacid.ItwasfoundthatTiO2/ACexhibitedahigherphotocatalyticactivitythanpureTiO2.ThereasonisthatactivecarbonactingaspowerfuladsorbentsupportsmakeshighconcentrationenvironmentsoforganicpollutantmoleculesaroundTiO2particles.
简介:N酰--hydroxy-4-phenyl-oxazolidinethiones能被处理很快在高收益变换成他们的乙醇thiol酉旨与在0è的EtSH
简介:Inthiswork,acidfunctionalizedmulti-wallcarbonnanotubes(MWCNTs)weremodifiedwithimidazolium-basedionicliquids.Theselectiveoxidationofvariousalcoholswithhydrogenperoxidecatalyzedby[PZnMo_2W_9O_(39)]~(5-),ZnPOM,supportedonionicliquids-modifiedwithMWCNTs,MWCNTAPIB,isreported.Thiscatalyst[ZnPOM@APIB-MWCNT],wascharacterizedbyX-raydiffraction,scanningelectronmicroscopy(SEM)andFT-IRspectroscopicmethods.Thisheterogeneouscatalystexhibitedhighstabilityandreusabilityintheoxidationreactionwithoutlossofitscatalyticperformance.
简介:TwonewintercalationcompoundsFe0.90PS3(phen)0.41(1)(phenstandsfor1,10-phenanthrolineincludingapartof1,10-phenanthrolineH+)andFe0.83PS3(bipy)0.34(2)(bipystandsfor2,2’-bipyridineH+)weresynthesizedbythereactionofthelayeredFePS,with1,10-phenanthrolineor2,2’-bipyridineinthepresenceofaniliniumchloride.Theywerecharacterizedbyelementalanalyses,powderX-raydiffraction(XRD),infraredspectroscopy.Thelatticespacingoftheintercalatewasexpandedby0.90nmforFe0.90PS3(phen)0.41and0.57nmforFe0.83PS3(bipy)0.34withrespecttothepristineFePS3,indicatingthattheringplaneoftheguestsisperpendiculartothelayerofthehost.TheUV-visabsorptionspectraofthefiltrateinpreparationoftheintercalatesindicatethat1,10-phenanthrolineor2,2’-bipyridinealsoactsasacomplexingagenttoremoveintralamellarFe2+ionsintothesolutionduringintercalation.Themagneticpropertiesof1and2werestudied.
简介:Anumberofnaphthalenedonorcompoundsthatpossessanadamantanaminebindingmoietyandan(OCH2CH2)n(nn1,2,3,4,6,8)spacerweresynthesized.Thefluorescencequenchingbetweenthesedonorsubstratesandmono-6-O-p-nitrobenzoyl-β-cyclodextrin(pNBCD)andmono-6-O-m-nitrobenzoyl-β-cyclodextrin(mNBCD)wasstudiedindetail.Itwasfoundthatveryefficientfluorescencequenchingcouldoccurinthesesupramolecularsystems.Thisquenchingwasattributedtothephotoinducedelectrontransferinsidethesupramolecularassemblybetweenthenaphthalenedonorsandcyclodextrinacceptors.DetailedStern-VolmerconstantsweremeasuredandtheywerepartitionedintodynamicStern-Volmerquenchingconstantsandstaticbindingconstants.Itwasdemonstratedthatthebindingconstantsbetweenallthenaphthalenecompoundsandcyclodextrinsarethesameastheypossessthesamebindingsite,i.e.,adamantanamine.
简介:过量臼齿的卷VmEand运动学的粘性为丙烯乙二醇monomethyl醚(1-methoxy-2-propanol)的二进制混合物作为作文的一个函数被测量了,MeOCH2CH(哦)我,丙烯乙二醇monoethyl醚(1-ethoxy-2-propanol),EtOCH2CH(哦)我,丙烯乙二醇monopropyl醚(1-propoxy-2-propanol),PrOCH2CH(哦)我,丙烯乙二醇monobutyl醚(1-butoxy-2-propanol),BuOCH2CH(哦)我,和丙烯乙二醇tert丁基醚(1-tert-butoxy-2-propanol),t-BuOCH2CH(哦)我与1-butanol臼齿的体积是的过量为系统2-butanol+1-methoxy-2-propanol,和+1-propoxy-2-propanol越过为有1-butanol的所有系统的全部范围ofcomposition否定、积极,为为系统2-butanol+1-ethoxy-2-propanol,和+1-tert-butoxy-2-propanol的系统2-butanol+1-butoxy-2-propanol,和变化符号否定。从试验性的数据,在从xii的动态粘性的偏差被计算了。两过量臼齿的卷和粘性偏差被方法用一个Redlich-Kister类型多项式方程相关为二进制系数和标准错误的评价最少平方。
简介:The1.3-dipolarcycloadditionreactionof2-trifluoromethyl-oxazoloneandtheactivatedcarbon-carbonmultiplebondwasstudiedandgaveaconvenientwaytosynthesize2-trifluoromethylpyrrolederivatives.
简介:热行为,机制和在一个规划温度的模式的标题混合物的发热的第一阶段的分解反应的运动参数借助于DSC,TG-DTG和红外被调查了。反应机制被建议。在微分形式,明显的激活精力(Ea)和这反应的pre指数的因素(A)的实验运动模型功能是(1-)?1.119,211.3kj/mol和1020.2s?1分别地。混合物的热爆炸的批评温度是202.2爠慥瑣潩?㈠低??湡敧漠??????????????鈿酌顛鱎?????疞????陴?陴?T