简介：6,9,11-Trihydroxy-6a,12a-dehydrorotenoid1(coccineoneB)wassynthesizedfrom2-hydroxybenzaldehyde2andphloroglucinol.

简介：Quasiclassicaltrajectorycalculation(QCT)isusedfrequentlyforstudyingcollisionalenergytransferbetweenhighlyvibrationallyexcitedmoleculesandbathgases.Inthispaper,theQCToftheenergytransferbetweenhighlyvibrationallyexcitedC6F6andN2,O2andgroundstateC6F6wereperformed.TheresultsindicatethathighlyvibrationallyexcitedC6F6transferredvibrationalenergytovibrationaldistributionofN2,O2andgroundstateC6F6,sotheyareV-Venergytransfer.EspeciallyitismainlyV-VresonanceenergytransferbetweenexcitedC6F6andgroundstateC6F6,excitedC6F6transfersmorevibrationalenergytogroundstateC6F6thantoN2andO2.ThevaluesofQCT,-〈△Evib〉ofexcitedC6F6aresmallerthanthoseofexperiments.

简介：(-)-(5R,6S)-6-Acetoxyhexadecan-5-olide1,anaturalmosquitoattractantpheromone,wassynthesizedfromreadilyavailablealdehyde2andcyclopentanone3usingL-proline-catalyzedasymmetricaldolreactionasthekeystep.

简介：ACupro-8-thioquinolinecoordinationpolymer,[Cu^I(C9H6NS)]n,wassynthesizedbymethano-thermalreactionofCuCland8,8′-dithiodiquinoline(dtdq)inamolarratioof2:1at160℃for7d.X-Raysinglecrystalstructuredeterminationrevealedtheformationofaone-dimensionalstructurebelongingtomonocliniccrystalsystem,spacegroupP21/cwithcellparametersa=0.8043(1)nm,b=1.8949(3)nm,c=1.1048(1)nm,β=110.109(4)°,V=1.5810(4)nm^3andZ=4,Thecrystalwasfoundtobestableuptoapproximately300℃bythermalanalysisandhaveanenergygap(Eg)of2.0eVexhibitedbyUV-Vis-NIRreflectancespectrum.

简介：Usingfourβ-cyclodextrinderivatives,2,6-di-O-benzyl-3-O-heptanonyl-β-CD,2,6-di-O-benzyl-3-O-octanonyl-β-CD,2,3-di-O-benzyl-6-O-heptanonyl-β-CD,and2,3-di-O-benzyl-6-O-octanonyl-β-CD,aschiralstationaryphasesofcapillarygaschromatography(CGC),theenantiomersofSharplessepoxideswerewellseparated.Theenantiomerexcessvalues(e.e.%)ofsomechiralSharplessepoxideswerealsodeterminedsuccessfullyusingtheseCDs.

简介：

简介：ThePd（PPh3）4-catalyzedcouplingreactionofalkenyl-disiamylboraneswithfurfurylchlorideinthepresenceoft-BuOKafforded（E）-furfurylalkenesstereospecificallyingoodyields.

简介：Anovelseriesofpyrido[1,2-e]purin-4(3H)-onederivativescontainingpolarsubstituentson5'-positionweredesignedandpreparedaspotentialPDE5inhibitors.Thispaperreportsthesyntheticroutes,1H-NMRdata,andthePDE5inhibitoryactivitiesofthetargetcompounds.Thepolarpiperazinylgroupcontained(on5'-position)compound,3B2,showedthehighestactivityamongthetestedderivativesbutlesspotencythansildenafil1.

简介：Thenovelcomplex[K(18-C-6)]2[Cd(mnt)2][18-C-6-18-crown-6,nmt=1,2-dicyanoethene-1,2-dithiolate,C2S2-(CN)2^2-]wassynthesizedandcharacterizedbyelementalanalysis,IRspectrumandX-raydiffractionanalysis.Thecomplexdisplaystwo-dimensionalnetworkstructureof[K(18-C-6)]complexsegmentsand[Cd(nmt)2]complexsegmentbridgedbyS-K-S,S-K-NandN-K-Ninteractionsbetweenadjacent[K(18-C-6)]and[Cd(mnt)2]units.

简介：利用Gaussian-94计算程序中的B3LYP方法,在6-311+G(2d)6d基组下,对Si5,Si5H3,Si5H6,Si5Li3和Si5Na3原子簇的几何结构进行优化和频率计算.结果表明,Si5原子簇中最稳定的具有D3h对称性的结构中,位于同一平面上的3个Si原子确实具有剩余的成键能力,可以与3个H,Li,Na原子和6个H原子形成稳定的化合物.研究还发现,虽然H,Li和Na都属同一主族,但它们与Si5原子簇中Si原子的键连方式却不同,而且它们的加入,对Si5原子簇的'三角双锥'结构也有不同的影响.

简介：Thesynthesisandspectrophotometricpropertiesof2-(6-methyl-2-benzothiazolylazo)-5-diethylaminophenol(MBTAE),andtheuseofitasaprecolumnderivatizingreagenttoseparateCo(Ⅱ),Ni(Ⅱ),Rh(Ⅲ)andIr(Ⅳ)complexesbyHPLCarediscussed.Whenthemobilephaseconsistsofmethanol/water(90/10Ⅴ/Ⅴ),acetatebufferwithpH4.0and5×10-5mol/LEDTAsolution,thefourcomplexesCanbeseparatedwithin9minonODScolumn.Thedetectionlimits(20μLsamplesize)are0.059ppb,0.062ppb,0.053ppband0.049ppbforCo(Ⅱ),Rh(Ⅲ),Ni(Ⅱ)andlr(Ⅳ)respectivelyatasignal-to-noiseratioof3.

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：Thetitlecomplexi-C4H9Co（salen）（Py）（Py=pyridine.salen=dianionofdisalicylideneethylenediamine）hasbeenfirstsynthesized.ItscrystalstructurehasbeendeterminedbyX-raydiffractionmethod.ThecrystsisaremonoclinicwithspacegroupP21/C.Theunitcellparametesarepresented.ThestructurehasbeenrefinedtoafinalRof0.038.

简介：Asurface-renewabletris(1,10-phenanthroline-5,6-dione)iron(Ⅱ）hexafluorophosphate(FePD)modifiedcarbonceramicelectrodewasconstructedbydispersingFePDandgraphitepowderinmethyltrimethoxysilane(MTMOS)basedgels.TheFePD-modifiedelectrodepresentedpH-dependentvoltannetricbehavior,anditspeakcurrentswerediffusion-controlledin0.1mol/LNa2SO4+H2SO4solution(pH=0.4).Inthepresenceofiodate,clearelectrocatalyticreductionwaveswereobservedandthusthechemicallymodiffiedelectrodewasusedasanamperometricsensorforiodatencommonsalt.Thelinearrange,sensitivity,detectionlimitandresponsetimeoftheiodatesensorwere5×10^-6-1×10^-2mol/L,7.448μA·L/mmol,1.2×10^-6mol/Land5s,respectively.Adistinctadvantageofthissensorisitsgoodreproducibilityofsurface-renewalbysimplemechanicalpolishing.

简介：ＤｉｍｅｒｉｚａｔｉｏｎＣｏｎｓｔａｎｔＤｅｔｅｒｍｉｎａｔｉｏｎｏｆ６－Ｏ－Ｂｅｎｚｏｙｌ－β－ＣｙｃｌｏｄｅｘｔｒｉｎｉｎＡｑｕｅｏｕｓＳｏｌｕｔｉｏｎ.ＤｉｍｅｒｉｚａｔｉｏｎＣｏｎｓｔａｎｔＤｅｔｅｒｍｉｎａｔｉｏｎｏｆ６－Ｏ－Ｂｅｎｚｏｙｌ?..

简介：Poly-3-methylthiophene(P3MT)在房间温度被综合离子的液体1-butyl-3-methylimi-dazoliumhexafluorophosphate([BMIM]PF6)由经常的潜在、经常的电流分别地。P3MT电影的结构和形态学被FTIR光谱和SEM描绘。undoped(减小)并且做(氧化)在离子的液体准备的P3MT电影的形式可逆、稳定。P3MT电影有维生素酸和罐头的electrocatalytic氧化的强壮的特征分开维生素酸和多巴胺的氧化山峰。潜在的步的二个方法被用来观察这部电影的反应时间，这部电影被发现有完美的electrochromic反应。

简介：Inanattempttofindnewantitumoragents,anovelclassofchromonecompoundswithabenzimidazoleorabenzoxazoleringinpositions2or6weresynthesizedviacondensationinpolyphosphoricacid(PPA)byusingchromoneacidsasthestartingmaterials.Duringthepreparationprocess,itwasfoundthatPPAcouldcleavethechromoneringtoproducearing-openingcompound(6).Themolarratioofthechromonecompound(5)tothering-openingcompound(6)variedwiththechangeofreactiontemperatureandtime.BasedonMTTprotocol,theantitumoractivityofeachofthecompoundsobtainedwasevaluatedagainstthreehumancancercelllines:KB(oralepidermal),A2780(ovary)andBel7402(liver).TheIC50variedfrom54.7μmol/Ltomorethan180μmol/L.

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：3-(2-Hydroxyphenyl)-6-(4-nitrophenyl)-7H-1,2,4-triazolo[3,4-b][1,3,4]thiadiazine,C16H11N5O3S,waspreparedbythecyclizationof3-(2-hydroxyphenyl)-4-amino-5-mercapto-1,2,4-triazolewith2-bromo-4-nitroacetophenone.Thecompoundwascharacterizedbymeansofelementalanalysis,IR,1HNMR,13CNMR,massspectrometry,andX-raydiffraction.ThecompoundcrystallizesinamonoclinicsystemwithspacegroupCc,a=2.1853(4)nm,b=2.1192(5)nm,c=1.3526(3)nm,β=95.21(2)°,V=6.238(2)nm3,Dcalcd.=1.505Mg/m3,Z=16,F(000)=2916,R1=0.0501,wR2=0.0427.Acomparisonbetweenthecrystalstructuresof1,2,4-triazolo[3,4-b][1,3,4]thiadiazineand1,2,4-triazolo[3,4-b][1,3,4]thiadiazolewasmadeinthestructuralview.Atwo-dimensionalnetworkisformedbyhydrogenbondsandπ-πstackinginteractions.

简介：Startedfrom5-hydroxy-2-pentanone,(R)(E)-3,7-dimethyl-2-octene-1,8-dioicacid,callosobruchusicacid,wassynthesizedviafivestepswithD-(-)-camphorsultamasthechiralauxiliary.Itwasofgoodopticalpurityandyield.