简介：Theelectrochemicalreductionbehaviorofbilirubin(BR)atplatinumelectrodeinDMFwasinvestigatedbycyclicvoltammetry,insituelectronspinresonancespectroscopyandinsiturapidscanningthinlayerspectroelectrochemistry.ExperimentalresultsrevealedthatthereductionofBRfirstlyundergoesanECEprocess:BR-+eBR-dimerize(BR)22-+e(BR)23-.Thegenerated(BR)23-canbere-oxidizedtoBRandthentopurpurin(Pu)byaseriesofoxidationprocesses:(BR)23--e(BR)22--2e2BR,BR--2eBV--2ePu.However,there-reductionreactionsofPuarenotthereverseprocesses.Thedifferentreductionmechanismsarediscussedindetail.

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简介：　　ThemissionoftheChemicalProcessR&DDepartmentatDuPontPharmaceuticalsCompanyistosupplydrugsubstanceinatimelyfashionandtodiscover/developascalable,economical,environmentallyfriendlyprocessforthecommercialproductionofthebulkdrugsubstance.Severalexampleswillbepresentedtoillustrateourefforttoaccomplishthemission.Briefdiscussionwillincludethefollowingprojects:1)SynthesisofDMP728,acyclicpeptideofGPIIb/IIIainhibitor2)Methodforthepreparationofa-chloroboronicacid,akeyintermediateforDuP714,apotentthrombininhibitor3)ProcessresearchanddevelopmentofRoxifiban,apotentandorallyactiveGPIIb/Illainhibitor　　……

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简介：Thepaperdealswiththedegradationoftheorganiccompoundsinthecokeplantwastewaterbythecombinedprocessofultrasonicirradiationandactivatedsludge.Theinfluencefactorsoftheultrasonicdegradationeffectsuchasairatmosphere,initialconcentration,ultrasonicpowerdensityandthecategoryandconsumptionofcatalystwereinvestigated.Awaterqualitymodelwasusedtoexplainthedegradationofdifferentkindsoforganiccompoundsinthecokeplantwastewaterbyultrasonicirradiation.Afterthewastewaterwastreatedbythecombinedprocessofultrasonicirradiationandactivatedsludge,theCODdegradationefficiencywas95.74%,whichis63.49%higherthanthatbytheprocessofactivatedsludgealone.

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简介：Anovelgel-likeprocesshasbeendevelopedforsynthesizingLiaNi0.8Co0.2O2powders,usingcitricacidasachelatingagent.Thisprocessimprovesthehomogeneityofconstituentcationandenhancestheirreactivityintheobtainedprecursor.Theresultsofelectrochemicaltestdemonstratedthatthesematerialsexhibitedexcellentelectrochemicalproperties.Itsinitialcapacityreached181.6mAh/gandreversibleefficiencyatthefirstcycleisabout88.6%.

简介：以电导-紫外检测器联用离子色谱法同时测定水中的F-、Cl-、NO2-、Br-、NO3-、I-和SO4（2-）。样品经TSKgelguardcolumnSuppeIC-AnionHS保护柱以及TSKgelSuppeIC-AnionHS分离柱分离,以NaHCO3（2.0mmol/L）-Na2CO3（3.0mmol/L）为流动相,流速1.5mL/min,柱温40℃,采用抑制电导检测器与紫外可见检测器串联检测。其中,F-、Cl-、Br-和SO4（2-）使用电导检测器,NO2-、NO3-和I-采用紫外检测器。7种离子均具有较宽的线性范围,其线性相关系数r〉0.999。对饮用纯净水以及海水两种实际样品进行测定和加标回收实验,加标回收率在92.8%107%,测定值的相对标准偏差（n=6）在0.89%5.7%。方法具有分析速度快,检出限低,精密度好等优点。在实际工作中具有很强的实用性和推广应用价值。

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＳｅｌｅｎｏｅｔｈｅｒｐｌａｔｉｎｕｍｃｏｍｐｌｅｘｅｓａｓａｎｅｗｋｉｎｄｏｆｈｙｄｒｏｓｉｌｙｌａｔｉｏｎｃａｔａｌｙｓｔｈａｖｅｂｅｅｎｄｒａｗｎｍｕｃｈａｔｅｎｔｉｏｎｒｅｃｅｎｔｌｙ．Ａｓｅｒｉｅｓｏｆｓｅｌｅｎｏｅ...

简介：Highlyselectivedimerizationofα-methylstyrene(AMS)waseffectedusingaBroenstedacidicionicliquid,[Hmim]^+BF4^-,assolventaswellascatalyst,providingtheindustrialhigh-valueolefin,2,4-diphenyl-4-methyl-1-pentene(1-PT).Thedesireddimer1-PTcouldbeobtainedin90%yieldat96%conversioninthedimerizationofAMSunderoptimizedconditions.Featuresoftheprocedureincludeuseofreadilyavailableionicliquid-catalyst,exclusionofvolatileorganicsolvents,higherselectivityandefficiencyfor1-PT.

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简介：Lophenol,cholest-4α-methyl-7-en-3β-ol(1),obtainedfromDracaenacochinchinensis(Lour.)S.C.Chen,wasstructurallymodified.Itwasacetylatedtoprotect3β-hydroxylgroup,andthenoxidisedbyseleniumdioxideinaceticacidtogivecholest-4a-methyl-8-en-3β,Ta-dioldiacetate(3).Thiscompound3isunstableinchloroformsolutionorwhenheatedandeasilyconvertedtoadienecompound,cholest-4a-methyl-7,14-dien-3β-olacetate(4).Thestructuresof3and4wereelucidatedbymeansofIR,^1HNMR,^13CNMRandMS,andtheabsoluteconfigurationof3wasestablishedbyX-raycrystallography.Thepropertyof3wasalsodiscussedinthispaper.Both3and4arenewcompoundsandwerereportedforthefirsttime.

简介：Thispaperreportstwolanthanidecomplexesofformula（C9H7）Ln（C8H8）·（THF）2whereLnisProrNd,C9H7isindenyl,andC8H8iscyclooctatetraene（COT）.ThecomplexeswerepreparedbythereactionofLnCl3withK（C9H7）andK2（C8H8）inTHF.（C9H7）Pr（C8H8）·（THF）2crystallizesinTHFat-15℃inthemonoclinicspacegroupP21:withunitcelldimensionsa=8.446（0）,b=10.083（2）,c=13.407（3）,β=105.48（1）°,V=1100.43（35）3,Dc=1.52g/cm3andZ=2.ThefinalRvalueis0.033,Rwvalueis0.030,respectively.In（C9H7）Pr（C8H8）·（THF）2afive-memberedringcentroidofC9H7,theC8H8ringcentroidandthetwooxygenatomsfromthetwoTHFmoleculesformadistortedtetrahedralgeometryaroundthemetal.

简介：通过5-甲基-7-甲氧基异黄酮与盐酸羟胺的缩合制得中间产物4-苯基-5-（2-羟基-4-甲氧基-6-甲基苯基）异恶唑,然后经过光异构化反应合成了4-甲氧基-6-甲基-7a-苯基苯并吡喃并[2,3-b]氮丙啶-7-酮,并采用IR,NMR,HRMS和单晶X-衍射分析对其结构进行了表征.单晶X-衍射分析结果表明：标题化合物属于单斜晶系,空间群P2（1）/n.在其晶体结构中,存在着氢键及芳香堆积作用,这些作用将标题化合物分子组装成了三维网络结构.

简介：8,8′-Dibromo-6,6′,7,7′-tetramethoxy-5,5′-diisopropyl-3,3′-oxydimethylenedinaphtho[2,1-b:2′,1′-d]furan,C32H30Br2O;M.W.=670;triclinic;spacegroupP1;a=8.896（2）,b=10.216（1）,c=10.423（1）A,α=108.48（1）,β=119.36（1）,γ=99.26（1）;V=723.5A3;Z=1,Dcal.=1.479g.cm-3.MoKα=28.11cm-1,F（000）=326,T=293K.Thestructurewassolvedbydirectmethodandfull-matrixleast-squaresrefinementconvergedatR=0.034for2377observedreflections.Theoxygenatominseven-memberedringexistsinadisorderedarrangement.Bothbisnaphthaleneandoxygen-containingfive-memberedringhaveplanarconformationswithdihedralangle6°,showingmarkedaromaticfeature.

简介：Aseriesofethyl6-alkoxy-7-phenyl-4-hydroxy-3-quinolinecarboxylatesweredesignedandsynthesized.Theirstructureswereconfirmedby~1HNMR,~(13)CNMR,IRandHRMS.ThebiologicalactivitieswereprimarilyevaluatedagainstEimeriatenellaaccordingtoAnticoccidialIndex(ACI)methodinvivo.Theresultsshowedthatcompounds5e,5fand5iexhibitedanticoccidialactivitiesagainstE.tenellaat27mgkg~(-1).

简介：用Co2（CO）8与CH3CSNH2反应制得产物Ⅰ，又用Na2Fe（CO）4与Ⅰ反应制得产物Ⅱ（Ⅰ：Co3（μ3－S）（CO）7（CH3CSNH），Ⅱ：Co2Fe（μ3-S）（CO）7（CH3CSNH）．通过元素分析。IR、UV、1HNMR、MS表征并用X射线衍射法测得Ⅱ的单晶结构.该簇合物属三斜晶系、PT空间群，晶胞参数：a=0．9203（1），b=1．1296（2），c=1.1425（2）nm；α=116．40°（2），β＝101．92°（2），γ＝92．58°（1）；z＝2，V=1．2162nm3，Dc＝1．698cm3，μ＝21．89cm-1.结构分析表明，Co2FeS构三角锥分子骨架，所有CO均为端基配体，S1为面桥基配体，CH3CSNH为双齿配体，与Co、Fe形成五元环结构．

简介：(±)-5,5'-Dihydroxy-7,7'-dimethoxy-8,8'-biflavone((±)-l)wasresolvedintoitsopti-callypureformsviatheformationandrecrystallizationofits(2R)-and(2S)-l-(4-toluenesulfonyl)proly-late,andthemethylatedderivativesof(+)-and(-)-lwerealsoprepared.Theabsoluteconfigurationsofallthese8,8'-biflavoneshavebeenconfirmedbytheirCDspectra.

简介：Thecrystalandmolecularstructuresof[(C3H7O)2PS2]2(CCDCNo.217201)weredeterminedbymeansofX-raycrystallography.ItcrystallizedinatriclinicsystemwithspacegroupP1^-andlatticeparametersa=0.82794(3)nm,b=0.84764(2)nm,c=0.85034(3)nm,α=97.78(3)°β=110.77(3)°,γ=94.95(3)°,V=0.54701(9)nm^3,Z=1.Inthismolecule,thetwodiisopropyldithiophosphategroups,[(C3H7O)2PS2]2,whichareparalleltoeachother,arelinkedbyanS--Sbondandthereexistinversioncentersinthemolecule,Inthestructure,theP=Sbondsinthetwodithiophosphateunitsaretrans-orientedtoeachother.