简介：降低polyketone合成的费用，稀土元素坐标催化剂被介绍给一氧化碳(公司)和苯乙烯(圣)的共聚化合物综合aliphaticpolyketoneSTCO。催化系统由稀土元素钕醋酸盐，乙酸钇，2,2''-bipyridine，p-toluensulfonic酸，含铜的p-toluensulfonate，和1,4-benzoquinone组成。Thecatalyst和共聚物被红外线的光谱和X光检查photoelectronspectrosco-py分别地描绘。催化系统的每个部件和共聚化合物的催化活性上的稀土元素醋酸盐的类型的效果被调查。结果证明建议稀土元素在公司和圣的copoiymerization有不同催化活性，最大的活动能到达303.3gSTCO/(摩尔中心点h)。

简介：Ｐｏｗｅｒｒｅｌｉａｂｉｌｉｔｙｐｒｏｍｏｔｅｄｉｎ１ｓｔｈａｌｆｏｆ１９９７Ｆｒｏｍｔｈｅｓｔａｔｉｓｔｉｃｓｏｆ２７ｍｕｎｉｃｉｐａｌｉｔｉｅｓａｎｄｐｒｏｖｉｎｃｉａｌｃａｐｉｔａｌｓｃｏｌｌｅｃｔｅｄｂｙｔｈｅＰｏｗｅｒＲｅｌｉａｂｉｌｉｔｙ...

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简介：容易地可得到的硫安类药剂白酒钛建筑群被发现在把alkynylzinc试剂的不对称的增加反应提升到unactivated上有效在很温和的条件下面的简单酉同类。并且相应chiral第三级的propargylic白酒与多达86%的enantiomeric过量被获得，它提供了一个简单、实际、便宜的方法产生chiral第三级的propargylic白酒。

简介：Spreadingofnanofluidsonsolidsubstratewasstudiedviamoleculardynamicssimulations.Simulationmodelsfortwoimmisciblefluids(oilandwaterbasednanofluids)confinedinaslitbetweentwoplanarsolidwallsweresetup.Theinfluenceofthevolumeconcentrationofthenanoparticlesonthethree-phasecontactlinemotionwasinvestigated.Wefoundthatthelargervolumeconcentrationresultsinmorevisiblenanoparticleadsorptiononsolidsurface.Thisefectfurtherinducesanadvancingdisplacementofthecontactlinecomparedwiththemeniscusprofilesinlowconcentrationcaseandthatwiththeabsenceofnanoparticles.Thesefindingsareconsistentwiththepreviousexperimentalandtheoreticalresultsandprovidetheatomic-scaleunderstandingonnanofluidspreading.

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简介：一个方便、有效的过程被tosylation和硅石胶化在这研究支持的随后的β-消除为酒精的变换开发到石蜡。有在在0℃的pyridine的p-toluenesulfonyl氯化物的白酒的处理负担得起在房间温度在dichloromethane或氯仿与硅石胶化经历β-消除的tosylates，产出有高生产率的石蜡。

简介：I.TheIdeaofPuttingPeopleFirstandtheRighttoDevelopmentfromtheContemporaryPerspectiveofHumanRights(1)Therighttodevelopmentanditsmaincontentsfromthecontempo-raryperspectiveofhumanrights.TheDeclarationontheRighttoDevelopmentadoptedbyUNGeneralAssembly

简介：pyrazolone衍生物的一个新班被孤立在对从在3-methyl-1-phenyl-5-pyrazolone和arylaldehydes之间的2:1冷凝作用反应的优秀收益好面对离子的液体[HMIM]HSO4。混合物被他们的红外，NMR系列，MS和元素的分析描述。方法论的重要特征是底层，更高的收益和更短的反应时间的一个宽申请范围。

简介：PromotedbySmI3,acetophenonesandbenzaldehydescanundergotheMukaiyamatypealdolcondensationinthepresenceofTMSCltoformchalconesingoodyields.

简介：IntroductionInthepastseveralyears,muchresearchworkhasbeendoneforthesynthesisofC-fusedbicyclo-β-lactamcompoundsandaconcise“DoubleAnnulation”procedurehasbeendeveloped.Theβ-lactamringisformedbytheclassicalStaudingerreaction［1—3］betweenα-(alkylthio)acylchlorideandanequivalentα,β-unsaturatedimine.Thesulfurringissubsequentlyfusedontotheβ-lactamunitbymeansofahalogen-promotedheterocyclizationprocess［4—6］.ThisprocedurewasappliedtothesynthesisofpenemasillustratedinFig.1.TheobtainedX-penemsareakindofimportantintermediatesforsynthesizingaseriesofβ-lactamcompounds,forexample,theyarecarboxylatedbycouplingreactionsontheCatomwhichislinkedtohalagen,formingpenem［7］.Animportantpurposeintheresearchfieldistoprobeintonewβ-lactammedicines.

简介：Zn/ZSM-5（NZ2）andZn/Ni/ZSM-5（NZ3）asthecatalystsformethanoltoaromatics（MTA）weresynthesizedbyasimpleultrasonicimpregnation.ThetexturalandacidpropertiesofallcatalystswerecharacterizedusingXRD,HRTEM,NH3-TPD,Py-IR,XPS,XRFandTGtechniques.TheXRDandHRTEMresultsshowedthatthebasiczeolitestructureswerenotaffectedmuchwiththeincorporationofZnandNispecies.However,greatchangeshavetakenplaceinacidproperties.ThePy-IRandXPSresultsindicatedthattheZn-Lewisacidsites（ZnOH+species）,whichhavestrongerinteractionwiththezeoliteframeworkcomparedwithZnOspecies,weregeneratedattheexpenseofBacidsiteswiththeincorporationofzincspecies.Moreover,theproductanalysisresultsshowedthattheincorporationofzincspeciespromotedtheprimaryaromatizationbyenhancingthedehydroaromatizationandsuppressingthecrackingandsubsequentH-transferreaction.Furthermore,theadditionofNispecieswellinhibitedthelossofzincspeciesbyconvertingpartialZnOspeciestoZnOH+species,andthusimprovedthearomatizationactivityandcatalyststability.ThecatalyticperformanceresultsshowedthattheNZ3possesshigherconversionofmethanolinalongertimeandloweraveragerateofcokeformationcomparedwithNZ2.Inaddition,theNZ3alsoexhibitedthehighestyieldofBTXasthereactionproceeds.

简介：Ashortandfacilesynthesisofaseriesof1,2-dihydroquiazolin-4(3H)-oneswasaccomplishedingoodyieldsvianovelreductivecyclizationofo-nitrobenzamideswithketonespromotedbyTiCI4/Znsystem.Thestructurewasestablishedonthebasisofelementalanalysis,IR,^1HNMRandconfirmedbyasingle-crystalX-raydiffractionanalysis.Thismethodhastheadvantagesofeasilyaccessiblestartingmaterials,convenientmanipulationandmoderatetohighyields.

简介：K-promotediron/carbonnanotubescomposite(i.e.,FeK-OX)waspreparedbyaredoxreactionbetweencarbonnanotubesandK_2FeO_4followedbythermaltreatmentsonapurposeastheFischer–Tropschcatalystforthedirectconversionofsyngastolowerolefins.ItscatalyticbehaviorswerecomparedwiththoseoftheothertwoFe-IMandFeK-IMcatalystspreparedbyimpregnationmethodfollowedbythermaltreatments.ThenovelFeK-OXcompositecatalystisfoundtoexhibithigherhydrocarbonselectivity,lowerolefinsselectivityandchaingrowthprobabilityaswellasbetterstability.ThecatalyststructureperformancerelationshiphasbeenestablishedusingmultipletechniquesincludingXRD,Raman,TEMandEDSelementalmapping.Inaddition,effectsofadditionalpotassiumintotheFeK-OXcompositecatalystontheFTOperformancewerealsoinvestigatedanddiscussed.Additionalpotassiumpromotersfurtherendowthecatalystswithhigheryieldoflowerolefins.Theseresultsdemonstratedthattheintroductionmethodofpromotersandironspeciesplaysacrucialroleinthedesignandfabricationofhighlyactive,selectiveandstableiron-basedcompositecatalystsfortheFTOreaction.

简介：NTrifluoromethyl和cyclopropyl代替了2-isoxazolines与hydroxylamine经由-trifluoromethyl-/-cyclopropyl-substitutedenones的支持DBU的牙齿反应被综合。牙齿反应由迈克尔增加和跟随的环合组成。大量3代用品5-cyclopropyl-5-trifluoromethyl-2-isoxazolines被获得在对在温和反应条件下面的优秀收益好。方法能也适用于另外的代替trifluoromethyl的enones。

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简介：AbstractBackground:Previous studies have revealed that diabetes mellitus (DM) promotes disease progress of gastric cancer (GC). This study aimed to further investigating whether DM advanced lymph nodes (LNs) metastasis in GC.Methods:The clinicopathologic data of GC patients with >15 examined LN (ELN) between October 2004 and December 2019 from a prospectively maintained database were included. The observational outcomes included the number (N3b status) and anatomical distribution (N3 stations) of metastatic LN (MLN).Results:A total of 2142 eligible patients were included in the study between October 2004 and December 2019. N3 stations metastasis (26.8% in DM vs. 19.3% in non-DM, P = 0.026) and N3b status (18.8% in DM vs. 12.8% in non-DM, P = 0.039) were more advanced in the DM group, and multivariate logistic regression analyses confirmed that DM was an independent factor of developing N3 stations metastasis (odds ratio [OR] = 1.771, P= 0.011) and N3b status (OR= 1.752, P= 0.028). Also, multivariate analyses determined DM was independently associated with more MLN (β = 1.424, P = 0.047). The preponderance of N3 stations metastasis (DM vs. non-DM, T1-2: 2.2% vs. 4.9%, T3: 29.0% vs. 20.3%, T4a: 38.9% vs. 25.8%, T4b: 50.0% vs. 36.6%; ELN16-29: 8.6% vs. 10.4%, ELN30-44: 27.9% vs. 20.5%, ELN ≥ 45: 37.7% vs. 25.3%), N3b status (DM vs. non-DM, T1-2: 0% vs. 1.7%, T3: 16.1% vs. 5.1%, T4a: 27.8% vs. 19.1%, T4b: 44.0% vs. 28.0%; ELN16-29: 8.6% vs. 7.9%, ELN30-44: 18.0% vs. 11.8%, ELN ≥ 45: 26.4% vs. 17.3%), and the number of MLN (DM vs. non-DM, T1-2: 0.4 vs. 1.1, T3: 8.6 vs. 5.2, T4a: 9.7 vs. 8.6, T4b: 17.0 vs. 12.8; ELN16-29: 3.6 vs. 4.6, ELN30-44: 5.8 vs. 5.5, ELN ≥ 45: 12.0 vs. 7.7) of DM group increased with the advancement of primary tumor depth stage and raising of ELN.Conclusions:DM was an independent risk factor for promoting LN metastasis. The preponderance of LN involvement in the DM group was aggravated with the advancement of tumor depth.

简介：为由用在没有溶剂的状况下面的三聚氰胺甲醛树脂(MFR)上的支持的硫的酸的aldoxime的脱水的nitriles的合成的一个简单、方便的过程被开发了。许多芳香、脂肪族的aldoximes被变换成相应nitriles。树脂为随后的反应被恢复并且再使用。

简介：Inthecurrentpaper,dry(CO2)-reformingofglycerol,anewreformingroute,wascarriedoutoveralumina(Al2O3)-supported,non-promotedandlanthanum-promotednickel(Ni)catalysts.Bothsetsofcatalystsweresynthesizedviaawetco-impregnationprocedure.Physicochemicalcharacterizationofthecatalystsshowedthatthepromotedcatalystpossessedsmallermetalcrystallitesize,hencehighermetaldispersioncomparedtothevirginNi/Al2O3catalyst.ThiswasalsocorroboratedbythesurfaceimagescapturedbytheFESEManalysis.Fromtemperature-programmedcalcinationanalysis,thederivativeweightprofilesrevealedtwopeaks,whichrepresentawatereliminationpeakatatemperaturerangeof373to473Kfollowedbynickelnitratedecompositionfrom473to573K.Inaddition,BETsurfaceareameasurementsgave85.0m2g-1forthenon-promotedNicatalyst,whilstthepromotedcatalystsshowedanaverageof1%to6%improvementdependingontheLaloadings.Significantly,reactionstudiesat873KshowedthatglyceroldryreformingsuccessfullyproducedH2.The2%La-Ni/Al2O3catalyst,whichpossessedthelargestBETsurfacearea,gaveanoptimumH2generation(9.70%)ataglycerolconversionof24.5%.

简介：CO2adsorptiononthesurfaceofhydrotalcite-derivedmixedoxidecatalystswasinvestigatedunderlowpressureglowdischargeplasmainopercindoconditionsviaFT-IRspectroscopy.Nickelcatalystswerepromotedwithvarioustransitionmetalspecies(Ce,Fe,La,Zr)toinfluencetheirphysico-chemicalproperties.FeandZrspeciesweresuccessfullyincorporatedintohydrotalcitebrucitelayers.AftercalcinationformedasinglephasewithNi(Mg,A1)Omixedoxide,whileLaandCespeciesformedseparatephases.ThishadaconsequenceinthedistributionofsurfacebasicsitesaswellasintheaffinitytoCOproduceduponCO2dissociationinplasma.Plasmatreatmentactivatedthesurfaceofpreparedmaterialsandchangedtheirpropertiesviathegenerationofstrongbasicsitesassociatedwithlowcoordinatedsurfaceoxygenanions.Moreover,theCO2adsorptioncapacityofpreparedmaterialsincreasedafterplasmatreatment.