简介：14-fluorophenyl-14H-dibenzo的灵巧、有效的合成[一，j]氧杂蒽被氟化的benzaldehydes的一个壶冷凝作用面对p-TSA景倠扳?牰瑯楥?戠瑵渠瑯椠?桴?敲敬獡?景倠扳?湡?獐兢瀠潲整湩?湩琠敨渠湯瀭潨灳潨祲慬整?湡?桰獯桰牯汹瑡摥倠?与萘粉开发了?敭扭慲敮s

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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：AF-5wassynthesizedthroughaconvergentmethod.ThekeystepwastheRobinsonannulationusingakeyintermediatepentylvinylketone.

简介：Tris)(η5-cyclopentadienyl-μ-carbonyl-iron)-μ3-nitrosylclusterwasobtainedfromthereactionofcyclopentadienyldicarbonylirondimerwithnitrogenmonoxideinxylene.Theclusterwascharacterizedbyelementalanalyses,IR,MSand1HNMR.Thecrystalstructureof[(η5-C5H5)(μ-CO)Fe]3(μ3-NO).C4H8OwasdeterminedbyX-raydiffractionanalysis.ItcrystallizesintheorthorhombicspacegroupPnma,a=9.053(2),6=10.545(2),c=22.525(4)A,V=2150.3(7)A3,Z=4,Dc=1.68g.cm-3;structuresolutionandrefinementbasedon1141reflectionswithI>3.0(I)(MoKa,A=0.71073A)convergedatR=0.0540.Theinfraredabsorptionbandat1325cm-1oftheμ3-NOinthecluster,whichisredshifted,showsthatμ3-NOisactivated.

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

简介：TwonewcoenzymeB12analogues,2’,5’-dideoxycytidylcobalamin(2a)and2’,5’-dide-oxyuridinylcobalamin(2b),andtwoothers,2’,5’-dideoxyadenosylcobalamin(2c),and5’-deoxy-thymidylcobalamin(2d)werepreparedbyanimprovedmethod.AllthefouranalogueswereinvestigatedbyUV-visand2D1HNMRspectroscopy.Thecomparisonsanddiscussionabouttheirspectroscopicpropertiesweredone.

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：Reactionsofthe6-hydroxy-thiopyrano[3,4-c]pyridine-5-carbonitrilederivative1withα-halo-carbonylcompoundsgavetheortho-substitutedintermediates2a-cwhichwereconvertedintofuro[2,3-b]thiopyrano[4,3-d]pyridines3a-cbyfusionofafuranmoietyunderbasicconditions.Furthercyclizationof3a-cledtoafusionofapyrimidinering,yieldingthetetracyclicproducts6,7and8.Inaddition,condensationof6withvariousaromaticaldehydesaffordedthecorrespondingimines9a,b.Mannichreactionof7gaveproducts10a,b.

简介：Fourteennew1-acyl-5-arylbiuretsweresynthesizedbythereactionofarylureaswithacylisocynantes.Thelatterwasobtainedfromacylchlorideandleadcyanateindichloromethane,usingpyridineascatalyst.Thestructuresofcompounds3a-nwereconfirmedbyIR,1HNMRandMSspectra.

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：gramine(C11H14N2)的低温度的热能力被精确测量在从78～401K的温度范围上的自动化断热的热量计。温度的功能被最少的广场方法适合的热能力的一个多项式方程。相对标准参考温度基于适合的多项式，弄平的热能力和混合物的热力学的功能298.15K在5K间隔被计算并且公布。在T=298.15K的混合物的燃烧的经常卷的精力被精确氧炸弹燃烧热量计作为cU=测量(35336.7

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简介：5-Amino-1,10-phenanthrolineandthreetypesofnew5-substituted1,10-phenanthrolinederivativesbydifferentalkylamides,phen-NHCOR[phen=1,10-phenanthrolineR=CH=CH2;(CH2)nBr,n=1,3-5(CH2)nCH3,n=9--14],weresynthesized.Theywerecharacterizedbymeansofelementalanalyses,infraredspectroscopy,protonnuclearmagneticresonancespectroscopy,andmassspectroscopy.Thesenewcompoundsareimportantligandsortheactivematerialsofruthenium(Ⅱ)electrochemiluminescent(ECL)sensors.

简介：ThecatalyticactivityofFe/ZSM-5fortheselectivereductionofNOtoN2withmethaneinthepresenceofexcessO2wasstudied.Fe/ZSM-5catalystswithvariousFeloadingswerepreparedbyimpregnationmethod.ItiswellknownthatmethaneisinactivewhenFe/ZSM-5asthecatalystfortheselectivecatalyticreduction(SCR)ofNOwithmethane.However,thispapershowsthatwhenthecontentofFewasabout0.5%,Fe/ZSM-5showedhighercatalyticactivityandselectivityofmethane,andputforwardmeasurableactivationforCH4isanimportantfactorforthereactionofremovalofNOxwithCH4.

简介：Sulfonylureaherbicideshavebeenwidelyusedbecauseoftheirlowapplicationrates,goodcropselectivitiesandlowmammaliantoxicities.However,somesulfonylureasmightpersistunfavourablyintheenvironmentwithresidualproblems.Inordertolookforecologicallysaferandenvironmentallybenignsulfonylureas,andonkeepingthepyrimidineringbeingmonosubstituted,15novelC5-monosubstitutedbenzenesulfonylureacompoundsweresynthesized.Thestructuresofallthecompoundssynthesizedwereconfirmedbyelementalanalysisand1HNMR.PreliminaryherbicidalactivitiesofthesenewsulfonylureacompoundsweredeterminedbyALSscreening(invitro)andpotbioassayexperiments(invivo).TheherbicidalresultsshowthatsomenovelsulfonylureasarecomparabletocommercialForamsulfuronandMonosulfuron.

简介：由中国仪器仪表学会分析仪器分会离子色谱专业委员会主办的第14届全国离子色谱学术报告会，计划于2012年9月下旬在陕西省西安市召开。届时将邀请国内外著名离子色谱专家作十余个专题报告。会议将就全国自上届学术会议以来在离子色谱及相关技术领域的新成就、新进展进行学术交流和讨论，热诚欢迎大家踊跃投稿和参加会议。

简介：由中国仪器仪表学会分析仪器分会离子色谱专业委员会主办的第14届全国离子色谱学术报告会，计划于2012年9月中旬在陕西省西安市召开。届时将邀请国内外著名离子色谱专家作十余个专题报告。会议将就全国自上届学术会议以来在离子色谱及相关技术领域的新成就、新进展进行学术交流和讨论，热诚欢迎大家踊跃投稿和参加会议。

简介：标题化合物（C30H35N3）以4-甲基苯甲醛、环十二酮和3-甲基-1-苯基-1H-吡唑-5-胺,在三氟乙酸和醋酸的作用下,经微波辐射合成得到.其结构通过单晶X射线衍射法确定,晶体属单斜晶系,空间群P21/c,相对分子质量Mr=437.61,晶胞参数a=1.08926（11）nm,b=2.1927（2）nm,c=1.04954（14）nm,V=2.4641（5）nm3,Z=4,晶胞密度Dc=1.180g/m3,吸收系数μ=0.069mm-1,单胞中电子的数目F（000）=944.晶体结构用直接法解出,经全矩阵最小二乘法对原子参数进行修正,最终的偏离因子为R=0.0468,ωR=0.0905.在晶体结构中新形成的吡啶环为共平面结构.

简介：Newmethodsfordehydrogenationofsteroidal2,5（10）-dieneswith2,3-dichloro-5,6-dicyano-1,4-benzoquinone（DDQ）orpyridiniumhydrobromideperbromide（PHP,Py·HBr·Br2）toaromaticAringsteroidinquantitativeyieldinshorttimearedescribed.