简介：Anewxanthone,1,2-dihydro-3,6,8-trihydroxy-1,l-bis(3-methylbut-2-enyl)-5-(l,1-dimcthylprop-2-enyl)-xanthen-2,9-dione(1),hasbeenisolatedfromtheaerialpartofHypericumerectum.

简介：ＩｎｔｒｏｄｕｃｔｉｏｎＦｌｕｏｒｏｉｏｎｏｐｈｏｒｅｓｄｅｓｉｇｎｅｄｔｏｃｏｍｐｌｅｘａｎｄｒｅｃｏｇｎｉｚｅｃａｔｉｏｎｉｃａｎｄａｎｉｏｎｉｃｇｕｅｓｔｓｐｅｃｉｅｓｈａｖｅａｔｒａｃｔｅｄｍｕｃｈａｔｅｎｔｉｏｎｉｎｒｅｃｅｎｔｙｅａｒｓｂ...

简介：Thymopentinderivative(septapeptide)waspreparedbymeansofthesolid-phasepeptidesynthesismethodinwhichstepwiseandsegmentcondensationswereinvolved.ThestructuresofthekeyintermediateandtargetmoleculewereconfirmedbyESI-MS,elementaryanalysis,IR,1HNMRand13CNMRspectrometriesinourexperiments.Inthisstudy,theauthorsfoundthatboththymopentinderivetive(septapeptide)andthymopentincouldpromoteTcellproliferationandincreaseofE-rosefomationcells.

简介：Apartiallysubstitutedβ-cyclodextrinchiralstationaryphasewaspreparedbythereactionofphenylisocyanate.TheenantiomersofaseriesofO,O-diethyl(p-methylbenzenesulfonamido)-aryl(oralkyl)-methylphos-.phonateswerestudiedonthepreparedphenylcarbamatederivativeβ-cyclodextrinbondedphaseandacommercial(S)-(.+)-l-(l-naphthyl)ethylcarbamatederivativeβ-cyclodextrinbondedphaseonnormalphasechromato-graphiccondition.Resultsshowthatthepreparedphenylcarbamatederivativeβ-cyclodextrinbondedphasehasbetterenantiomericselectivitytotheseriesofcompounds.Achiralrecognitionmechanismwassuggestedfortheseparationofthesenovelorganicphosphorusenantiomers.

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简介：Anovelβ-cyclodextrin(β-CD)derivativebearingdiethanolaminemoietywassynthesizedbyaconvenientmethodwith63%yield,andthenewhostcompoundwascharacterizedby(13)~C-NMR,FT-IRspectraetc,

简介：1IntroductionFullerenehasreceivedconsiderableattentionandagreatresearchinginterestduetoitsuniquestructureandinterestingproperties[1-3].Manyfunctionalgroupshavebeenintroduced,oftenregion-orstereo-selectively,fortuningthephysicalpropertiesofC60andforconstructingsupramoleculararchitectures[4-6].AmongallkindsofC60derivatives,thediseoticmolecule-substitutedC60derivativesshowinterestingproperties,especially,liquidcrystalproperties.Uptonow,fewC60derivativeswithdiscotic-moleculargroupsandtheirliquidcrystalpropertieshavebeenstudied.In1996,Deschenauxetal.[7]reportedthefirstmesomorphicC60-ferrocenederivative.Tianetal.[8]synthesizedaC60-perylenederivativein2004.Nakanishietal.[9]preparedaseriesofuncommonliquidC60derivativeswith2,4,6-tris(alkyloxy)benzalgroupsin2006.Lately,Geertsetal.[10]describedthesynthesisofmesogenicphthalocyanine-C60.

简介：Insituphotochromicprocessinthemonolayerofaphotochromicspiropyranderivativewithoutlongalkylchain,wasinvestigated.Thephotochromismattheair/waterinterfaceunderdiffernetsurfacepressureswasstudiedbysurfacepressure-areaisotherms,surfacepressure-timecurves,area-timecurvesandBrewsteranglemicroscopy.Bothformsofthecompoundwerefoundtoformmonolayersattheair/waterinterfacealthouhgitdoesnothavelongalkylchain.Alargeareaexpansioninthemonolayercorrespondingtoazreo^thorderreactionwasfoundattheinitialstageoftheUVlightirradiation.Aseriesofdynamicinvestigationsrevealedthatathighpressureafterphasetransitioninthemonolayer,thesurfacepressurechangesgreatlyumderalternativeirradiationofUVandvisiblelight.Anobviousmorphologicalchangeaccompanyingwiththephotochromismwasobservedinsitu.

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简介：Electroactiveself-assembledmonolayers(SAMs)containingviologeugroupareformedthroughtheadsorptionofthiol-functionalizedviologencompoundCH3(CH2)9V2+(CH2)8SH,whereV2+isN,N’-diaIkylbipyridinium(i.e.aviologengroup),ontogoldelectrodesfrommethanol/watersolutionanditselectrochemicalbehaviorisinvestigatedbyAcvoltammetryandsquarewavevoltam-metry,whichhavethehighsensitivityagainstbackgroundcharging.TheviologenSAMformedisasub-monolayerandthenormalpotentialscorrespondingtothetwosuccessiveone-electrontransferprocessesoftheactivecenters(viologen)are-360mVand-750mV(vs.Ag/AgCl)in0.1mol/Lphosphatebuffersolutions(pH6.96)respectively,andthestandardelectrontransferrateconstantis9.0s-1TheelectrochemicalbehaviorofthisSAMinvarioussolutionshasbeenpreliminarilydiscussed.

简介：Amethodofsynchronous-high-derivativespectfluorforidentificationofcrudeoilandfueloilpollutionisstudied.Thebestoperationconditionsforthe2ndand4thderiv,areset.Todifferentiateoil-spillatriverandsea,thismethodisrapidandsimple,andthespectrahavehighresolutionpoweras"fingerprint".

简介：Refluxingcalix[4]-1,3-substitutedbenzaldehydederivative(4)withglycinehydrazidederivative,weobtainedanovelcalix[4]arenehydrazonederivative(5)via'1+2'condensationinayieldof78%.Inthereactionofcompound4withL-leucinehydrazidederivativeatroomtemperature,lariatcalix[4]-1,3-aza-crown(6)withchiralaminoacidgroupasbranchedchainwassynthesizedvia'1+1'additioninayieldof70%.Thepreliminaryextractionexperimentssuggestedthathostingcompounds5and6possessedgoodcomplexationabilitiesforα-aminoacids.

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.