Syntheses and Crystal Structures of 4,4′Diformyl-diphenoxyethane and 4,4′4′′-Triformyl-triphenoxytriethylamine

1 INTRODUCTION With the methods of [2+3] and [1+1] tripodal condensation of polyaldehyde with polyamine, many Schiff bases and their relative reduced polyaza cryptands have been facilely synthesized in high yields[1～5]. In this one-step route, some metal ions such as alkali[2, 6, 7], alkali earth[8], rare earth[9, 10] and other transition ions[4, 11, 12] were used as templates[13, 14]. Formerly, the dialdehydes are needed to be rigid structures[15] to prevent themselves from polymeri…     

Synthesis and Crystal Structure of Zn（Ⅱ） Complex with 2-Aminopyridine and Acetylacetone

1 INTRODUCTION As one kind of compound with extensive phy- siological and pharmacology activities[1], 2-amino- pyridine is easy to form complexes, and some of which may catalyse hydrolysis of ester[2]. Acetyl- acetone is an useful intermediate in the synthesis of sulfanilamide, additive and catalyst[3]. Complexes containing acetylacetone take on excellent lumines- cent properties[4]. To be an active center of some sig- nificant enzymes[5, 6], zinc takes the form of its su- pramolecular co…     

Cycloaddition of benzoheteroazepine II Reactions and conformations of cycloadducts on1,5-benzothiazepines and 1,5-benzodiazepines with nitrile imine and nitrile oxides

Benzodiazepine and benzothiazepine derivatives have been well known as therapeutically important compounds. Four new tricyclic heterocyclic compounds, 3a,4,5,11-tetrahydro-3H-1,2,4-triazolo[4,3-d] [1, 5]benzothiazepines (3), 3a,4,5,11-tetrahydro-3H,6H-1,2,4-triazolo[4,3-d][1,5]benzodiazepine (4), 3a, 4,5,11-tetrahydro-1,2,4-oxadiazolo[4,5-d] [1,5]benzothiazepines (5, 6) and 3a,4,5,11-tetrahydro-6H-1, 2,4-oxadiazolo[4, 5-d] [ 1, 5 ] benzodiazepines (7,8), have been synthesized by 1,3-dipolar cycloaddition reactions of 2, 3-dihydro-1, 5-benzothiazepines and 2, 3-dihydro-1H-1, 5-benzodiazepine with benzonitrile N-phenylimine and benzonitrile oxides, respectively. The conformations of some cycloadducts and cycloaddition mechanism are described.     

Kinetic and mechanism of oxidation of thiocarbohydrazide and its metal complex by acid bromate in aqueous and partial aqueous media

The kinetics of oxidation of thiocarbohydrazide in the free and zinc(Ⅱ)-bound states byacid bromate have been studied in aqueous and water-acetic acid(1:1,V/V)media under varyingconditions,both in the absence and presence of added bromide ion.The rates of oxidations show firstorder kinetics in[bromate]in all the cases,but exhibit different kinetic behaviour in[substrate]and[H~+].Oxidation of TCH in aqueous medium shows zero order in[TCH]and nearly second order in[H~+],while oxidation in aqueous acetic acid shows two ranges in[H~+].The rate shows first and fractionalorder kinetics in[TCH]in the first and second acid ranges.Kinetics observed in the presence of Br~-are similar to those observed for oxidation of TCH in second acid range.In addition,the reactionshows fractional order in[Br~-].Oxidation of TCH in Zn(Ⅱ)-bound state exhibits first order kinetics in[substrate]and second order in[H~+].Increase in ionic strength of the medium decreases the rate in allthe cases.Increase in acetic acid composition of the solvent increases the rate.Mechanisms consistentwith the observed results have been considered and the rate laws deduced.The rate limiting steps havebeen identified and the coefficients of these steps have been calculated at different temperatures.Therelated activation parameters have also been computed.The validity of the deduced rate laws has alsobeen tested by recalculating the rate constants from them as[TCH]and[H~+]are varied.     

Synthesis and Characterization of One-dimensional and Two-Dimensional Porphyrin Polymers (Ⅰ)

Porphyrin polymers are of interest in relation to conductive materials[1, 2], catalysts for photosynthetic charge separation[3], or the fundamental features in biological systems[4]. There have been many versatile studies about them[5.6]. The one-dimensional "Shish Kebab"porphyrin polymers synthesized with a new method different from those reported and Schiff-base porphyrin polymers with two-dimensional nano-structure have provided a new field of study. The present paper covers highly ordered…     

The Synthesis, Luminescence and Energy Transfer of the Binary and Ternary Complexes of Rare Earth with Aminobenzoic Acids and 1,10-Phenanthroline

Inrecentyears.therehasbeenagrowingintereStinthePOtenhalaPPlicahonofeuroPium~terbiumcoordinationcompoundsasltalnescentInaerialandltalnescentprobesforavarietyofchendcalandbiologitalp'Stems[l].ConsiderableinveingationswerefocusedontheltalnescenceproPenies,energi'matchandenergr'transferofaschelateswithochtones[2'3].Howevr,littleattentionha5beenPaidtotheltalnescentlanthanidecomplexeswithcarbonyIicacids14].ComParedtotherareedchelateswith6-diketones.thecomPlexeswitharomaticCarboxylicacidsoffCra…     

Fluoride and lead adsorption on carbon nanotubes

The properties and applications of CNT have been studied extensively since Iijima discovered them in 1991[1,2]. They have exceptional mechanical properties and unique electrical property, highly chemical stability and large specific surface area. Thus far, they have widely potential applications in many fields. They can be used as reinforcing materials in composites[3], field emissions[4], hydrogen storage[5], nanoelectronic components[6], catalyst supports[7], adsorption material and so on.…     

The QSAR Research of Pyrrolobenzothiazepinones and Pyrrolobenzo-xazepinones-Novel and Specific Non-Nucleoside HIV-1 Reverse Transcriptase Inhibitors

IntroductionQSARisoneofthevaluablemeansindIugdedgne~allyfOrthoSesubStrateSwhicharenoknonclearly'ThetIadihonalQSARwasprDPagaIedbyHanschandFuitawhicheInPloyedmultiPlelinearregressiontechitiquestoobtalnqndtativerelationshiPs,ReCentiysome3DDSANmethodsareproposedwhichcantreastericandeleCtrnicproPertiessimultaneouslyinamorepraedcalmannr.TwoofthemoStsuccesthe3DQSARmdsodsareCoMFA[l],un-3D[2].AJthoughgreatPrOgresshasbenaCqulwttheSemethodshavehencrihdzedandshouldnillbeconsideredinthot…     

Synthesis and Crystal Structure of β-Diketiminate Ytterbium Dichloride

1 TRODUCTIINON The monoanionic b-diketiminato ligands, [ArNC(R)CHC(R)NAr]- [1], are ideal for use with metals and have been applied for early[2] and late[3] transition metals and group 13 metal complexes[4]. These ligands have several attractive feature…     

Optical Spectroscopy Properties of KMgF3 ：Eu^2＋ Nanocrystals and Powder Synthesized by Microemulsion and Solvothermal Process

IntroductionPerovskite complex fluorides have attracted great ainterest due to their particular physical properties, suchas piezoelectric characteristics[1], ferromagnetic prop-erty[2], nonmagnetic insulator behavior[3], and photo-luminescence host functi…     

Synthesis and Crystal Structure of Tetraimidazolium Dinicotinatooctamolybdate

1INTRODUCTIONPolyoxometallates(POM)areofgreatinterestnotonlyfortheirstructuralvarietybutalsotheirunexpectedproperties[1,2].Theseinorganicanionshavebeenwidelyinvestigatedasdiversascatalysis,biology,medicine,magnetochemistryandmaterialscience[3～7].Thestudiesonthecoordinatedpoly-oxometallateswithorganicligandsmighthelptounderstandtherolesofpolyoxometallatesoncatalysis.Todate,aseriesofoctamolybdateswhichcanbedescribedas[Mo8O26X2]2n－4(nisthenormalchargeofthecoordinatedbaseX)havebeenreport…     

Spectroscopic and Electrochemical Studies of the Interaction Between Fuchsin Basic and DNA

Introduction DNAbiosensorsareacompletelynewtypeoftech nologicalconceptionsbyusingspecificaffinitybetween mattersinlivingbeingstodistinguishdirectlyand quicklysequence specificDNA[1].Withtherapidde velopmentofgeneticengineering,oneofthekeyissues needtobere…     

cDNA Cloning, Prokaryotic and Eukaryotic Expression and Characterization of Porcine Leukemia Inhibitory Factor

Introduction Theleukemiainhibitoryfactor(LIF)isamulti functionalcytokinebelongingtotheinterleukin6(IL6)family[1].Itwasfirstfoundasamyeloidleukemic cellproliferationsuppressoranddifferentiationinducer cytokine[2].ThenaturalformofLIFisa38to67kDa glycosylate…     

Novel Bis-hydroxymethylation of Imidazole and 2-Methylimidazole

Sincethedevelopmentofsupramolecularchemistrytheheterophaneshavbeenattractinggrowingattentionbecauseoftheirpotentialuseasartificialempesandreceptors,inseif-assembly,innanoscalemachinery,andinprovidinginsightintononcovalentbondinginteractions[1-2].Thoughavarietyofheterophaneswithnovelstructuresandpropenieshavebeenreported,onlyafewarecomposedofinddazole[3-10].4,5-bis(hydroxymethyl)imidazoleanditsderivativesarehighiyimportantintermediatesfortheSynthesisofvariousimidazolophanes,imidazolecrownethers…     

First Preparation and Reactivity of γ-Oxo Vinyliminophosphorane

Theaza-Wittigreactionofviny1indnophosphoranehasbeenutilizedsuccessfullyinheterocyc1icsynthesis[1:'VinylindnophosphoranemaybeconsideredtobeanequlvalentofenandneandtocontaintwonucleophiliccentersatthepearbonatOmofthevinylsidechainandthenitrogenatomoftheindnophosphoraneportion.ThisiswhyitcanreactwithQ,fyunsaturatedketones,a,PunsaturatedaldehydesororhaloketOnestogivepyridinesorpyrazoles'However,therearefewreportsonthey-Oxovinylindnopbospborane[:J'Herewewishtoreportthefirstsynthesisandreactivity…     

Synthesis and Crystal Structure of Carvedilol

1INTRODUCTI0NCarvedilol,1-(4-carbazolyloxy)-3-[2-methoxyphenoxy)ethylaminoj-2-propanol,isanewgblockingandvasodilatingagent"'.IthadsynthesizedbyF.Wiedemannetalt23.Howeverthereportaboutcrystalstructureofcarvedilolhasnotbeenseen.Inthispaper,wediscussthecrystalstructureofthecarvedilolsynthe-sized[2ibythereacti0nof4-(2,3-ex0xypropoxy)-carbazoleand2-(2-methoxyphe-noxy)ethylamine.Sinceknowledgeofthemolecularandcrystalstructureofcarvedil0lwasconsideredusefulforunderstandingthemechanismoftheactio…     

One-dimensional Hydrogen-bonded Polymer Based on Tetra-iso-butyl-resorcin[4]arene and 2,6-Diacetylpyridine

1INTRODUCTIONResorcin[4]arenesarecavity-shapedmacro-cycleswhichcanbeeasilysynthesizedfromresor-cinolandaldehydesinthepresenceofacidiccataly-sis[1].Theyareattachedmuchinterestinthefieldofsupramolecularchemistryasartificialreceptorsandstartingmaterialsforthepreparationofmoresophis-ticatedmolecules[2].Duetotheirstructuralfeaturestheyplayanimportantroleashostmoleculesforavarietyofneutralandchargedguestcompounds[3].Theresorcin[4]arenesusuallyadoptfourdifferentcon-formers,crown(rccc,C4),boat(rc…     

Total Synthesis of Q-Chamigrene and β-Chamigrene

Spirocyclicsesquiterpenes,agrouPofspecialsesquiterpenoidwhichhaveaspiro[4,5]-decaneoraspiro[5,51-undecanestrUctureasthebasicskeleton,areattrctivetargetfortotaISynthesisbecauseof,inadditiontotheuniquestereostrUctUralfeatUrs,theirexcellentphysiologicalactivihesandexten-sivelyoccurringinnatUre.Inthisfamily,Q-chamigreneandD-chamigrene,isolatedfromSChisan-drachinensisI1]andChamaeoparistatwanesisl'],respectively,arecharacteristicmembers.lnthispa-per,wereportedtotalsynthesisof(t)-Q-chamigreneand…     

Determination of Magnolol and Honokiol by Non-aqueous Capillary Electrophoresis

Introduction Capillaryelectrophoresis(CE),ahighefficiency separationtechnique,hasrapidlydevelopedsince1981[1].Notonlyhavedifferentmodesbeenrepor ted[1—3],butalsosomenon aqueouselectrophoresis media[4]havebeenapplied.Theimportantproperties ofnonaqueousmed…     

Tree-gel and loop-gel conversions in nonlinear polymerization

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