Crystal Structure of 3- (4-Methoxyphenyl )- 1-methylpyrrolo [2, 1-b] benzothiazole

lINTR0DUCTI0NSincebiologicalandpharmacol0gicalactivitieshavebeenwellknownfornumer-ousheterocyc1icar0matictricyc1es""',muchattenti0nhasbeenpaidtothesynthesisoftheheterocycliccompoundswithnovelringsystem(').Inrecentyears,ourwork-inggr0uphassynthesizedaseries0f1,5-benzothiazepineandl,5-benz0diazepinetri-cyclicderivativesandstudiedtheirstructurest4~10i.l,3-Disubstituded-pyrr0l0F2,1-bjbenz0thiazo1eshavebeenobtainedasmainbyproductsinthecycloadditionreactionofl,5-benzothiazepineswithdichl0rocarbe…     

Proton-Template Synthesis of a П─Conjugated Macrocycle and Structure of its Ni_2(Ⅱ)—Complex

Robson-typemacrocycliccomplexesareplanarbinuclearcomplexesderivedfromSchiff'sbasecondensation0f2,6-diformyl-4-alkylphenolwithalkylenediamineinthepresenceofmetal;".Inthepastmorethan2Oyearsal0tofsuchcomplexesweresgnthesisedinthiswayandinvestigated':'>.Butthecomplexesofsuchamacrocyc1ewith1,2-phenylenediaminebridgewereneverrePOrteduntilveryrecentlyBrychcyetal.havegotsomeofthemalsobymetal-templatemethed`&,J.Sinceall-ring-systemoftheligandisconugated,itScomplexeshavemoreinterestfortheirexpectedun…     

Synthesis of α-Seleno Substituted Semistabilized Arsonium Ylide and Its Wittig Reaction

-SeIen0substitutedphosphoniumylidesaredifficuItt0undergoWittigreaction.1'2Wefirstlysynthesizeda-selen0substitutedstabilizedars0niumylidesandfoundthattheycouldunderg0Wittigreacti0nssm00thly."'Asthec0ntinuati0n0f0urresearch,weat-temptedtosynthesizeQ-selenosubstitutedsemistabilizedarsorniumylideandexploreditsWittigreaction.Addingdr0pwisephenylselanylbr0mide2t02equivalentsof4-nitrobenzylidenetriphenylars0ranelinmethanol,wefoundthatthetransylidati0nreactiont0okplacerapidly.Whenthereacti0ntempera…     

氯乙烯/N-苯基马来酰亚胺共聚物组成控制和优化

研究了氯乙烯 /N 苯基马来酰亚胺 (VC/PMI)共聚物组成随转化率的变化 ,体系中共聚物的累积组成偏差小于 0 0 5或 0 1的单体配比范围很小 ,采用加入第三单体丙烯腈 (AN)的方法进行改善 ,并以PMI在共聚物中的累积组成偏差作为控制参数 ,得到了PMI在共聚物中的累积组成偏差小于 0 0 5和 0 1的VC/PMIlAN较优的配比范围 .结合悬浮聚合工艺的特点 ,确定了VC/PMI/AN悬浮共聚的最佳单体配比范围为f1=0 72～ 0 84 ,f2 =0 0 2～ 0 0 4 ,f3 =0 1 2～ 0 2 4 .     

LnBaB9O16:Pr3+(Ln = La, Y)中Pr3+的双光子发射

在216nm紫外光激发下,LaBaB9O16:Pr3+中的Pr3+离子可以发生双光子发射;稀土离子在LaBaB9O16中处于非中心对称格位,Pr3+离子的4f5d能态高于1S0能级,可以发生从1S0能级到中间能态及基态的双光子跃迁发射;LaBaB9O16中与稀土离子近邻的硼酸根离子为BO4,相应的B-O振动频率较低,3P0与1D2之间的无辐射跃迁几率比较小,可以出现从3P0能级的发射.在YBaB9O16中,Pr3+的4f5d能态低于1S0能级,不能发生双光子发射.     

LnBaB_9O_(16)︰Pr~(3+)(Ln=La,Y)中Pr~(3+)的双光子发射

在216 nm 紫外光激发下, LaBaB9O16︰Pr3+中的Pr3+离子可以发生双光子发射; 稀土离子在LaBaB9O16中处于非中心对称格位, Pr3+ 离子的4f5d能态高于1S0能级, 可以发生从1S0能级到中间能态及基态的双光子跃迁发射; LaBaB9O16中与稀土离子近邻的硼酸根离子为BO4, 相应的B-O振动频率较低, 3P0与1D2之间的无辐射跃迁几率比较小, 可以出现从3P0能级的发射. 在YBaB9O16中, Pr3+ 的4f5d能态低于1S0能级, 不能发生双光子发射.     

Synthesis of 4''''-Methoxy Flavone

Theflav0nesare0btainedmainlyfr0mnature,sec0ndlybybiol0gicalsynthesis.ThechemicaIsynthesisiscarried0utm0stIybycyclizati0nandc0ndensati0n0f0-hydroxyacet0phe11one"',orbydehydr0genati0n0fflavanones4'5'6.Herewerep0rtanewsyntheticmethod0fflav0nesbythereacti0n0fenamineandheptanedioylchIoride.AcyIation0f2m0Ieenaminewithlm0lechl0ride0fdicarb0xylicacidhasbeenusedt0preparebis-(l,3-diket0ne)compound',butwediscoveredthat4'-methoxy-5,6,7,8-tetrahydroflav0nepreparedbyreacti0n0f4-meth0xyacet0phen0neenamine…     

An Improved Synthesis of α-Phenylseleno Arsonium Ylides

The first a-seleno arsonium ylides have been synthesized by Typical procedure for the synthesis of compound sa. To a stirred suspension ofmethoxycarbonylmethylene triphenylarsorane (4a) (0.378 g, I mmol) and triethylamine(0. I I g, 1. 1 mmol) in MeOH-Et,O (0.6 mml, v/v=l f I ) was added dropwise the solutionof phenylselenenyl iodide 2 (0.85 mmol) in MeOH-Et,O (2.8 mml, v/v=l f l) at 0 "C for14 hrs. The mixture was stirred again for 6 hrs. After the solvent in the mixture wasevaporated un…     

High Stereoselective Glycosylation of Calix[4]arenes with α-Acetobromoglucopyranoside

Ithasbeenevidencedthatcthehydratesp1ayamajorroleinnature,etwallyasrecoghtiondeterminantsuchasinh0st-pathogeninteractionsorincell-cellintendions.Moreover,dramaticchangesinthestruct-Uresofcarbohydratemoiety0fglycocojugaesoftenareassociatedwithcogeniceventsWhichaIlowtousesomeofthemastumormarkersusefu1f0rdiagnosticpurp0ses.'Inordertobetterundersbodtheseinteractionandtodeve1opbio1ogicalaCtivecomPOundsbased0nm0lecularrecoghtion,stereoc0ntrolledgJycoSylationhasbecome0neofthemostimPOrtanttopicinor…     

Four-Level Decay Model of~6P_(7/2) Excited State of Eu~(2+) Ion in KMgF_3

Optical transitions of divalent Europium (4f7) ions in KMgF3 have been investigated extensively due to the potential applications for phosphors or lasers. In KMgF3: Eu2+, the 6P7/2 state is at lower energy than the lowest 4f65d state. However, the reported energy differences between the two states vary from author to author. Sardar et al.1 estimated the value of 1250 cm-1 from a semilog plot of the 6P7/2?8S7/2 and 4f65d? 8S7/2 emission intensities versus T-1. Altshuler et al.2 found the …     

Synthesis of N-Aryl-2- （1＇, 6＇-dihydro-6＇-pyridazinone-3＇-carbonyl） Thiosemicarbazides and Their Related Heterocyclic Compounds

1,6-Dihydro-3-hydrozinocarbonyl-6-pyridazinone (compound 2) were prepared from α-ketoglutaric acid and hydrazine hydrate. A series of N-aryl-2-(1‘,6‘-dihydro-6‘-pyridazinone-3‘-carbonyl) thiosemicarbazides 3a-3f were synthesized from the reaction of aryl isothiocyanates with compound 2. The terminal compounds 1,3, 4-thiadiazole, 1,3,4-oxadiazole and 1,2, 4-triazol-5-thione derivatives were cyclized from compounds 3a-3f. Their structures were confirmed by IR,^1H NMR, MS and elemental analyses.     

我国变价稀土化学与物理的研究现状

稀土元素的主体一镧系元素原子的电子层结构为[Xe]4f~(0-14)5d~(0-1)6s~2。当其失去两个6s和一个5d或4f电子后,形成了最常见的Ln~(3+),其中La~(3+),Gd~(3+)及Lu~(3+)的4f亚层分别为全     

中国科学院上海有机化学研究所1980年研究生入学试题参考答案

一克分子理想气体进行的如下循环:1→2等温膨胀,2→3绝热膨胀,3→4等温压缩,4→1绝热压缩。经过循环后体系的热效率η=(T_1-T_2)/T_1即仅与二端温度有关,而与工作介质无关。所做的功W=Q_1η是理想热机的最大功。 2.f=C-P 2 描述组分数C,相数P和自由度f之间的关系不能改变此时f=1-3 2=0意味着一旦改变温度或压力必定伴随一相的消失。     

A New Ionic Trimolybdenum Cluster Compound:〔Mo_3S_7(S_2P(iprO)_2)_3〕〔S_2P(iprO)_2〕

1INTRODUCTIoNInthepastdecades,thechemistryofMo-Sclusterscontaininga[Mo,(p,-S)(p-S,),j corehasbeenstudiedtextensively,andmanysuchkindofcompoundshavebeensynthesized.(1'2'3'4iHowever,fewcompoundscontainingadiscreteclus-tercationhavebeenreported.[5iInthispaper,wereportthesynthesisandstructureofthetitlecompound.Thisisanewexampleoftrimolybdenumclustercontainingadiscreteclustercation.2EXPERIMENTALAllmanipulationwerecarriedoutinair.2.1Synthesis0f[M0,S,(S,P(iprO),),jtS,P(iprO),jAmixture…     

Synthesis and Anticonvulsant Activity of γ-Aminobutyric Acid Derivatives

y-Aminobutyricacidisregardedasoneofthemaj0rinhibit0ryneur0transmittersinthemammaliancentralnervoussystem."'UnderPhysiologicalconditi0ns,y-aminobutyricacidpo0riycrossestheb1ood-brainbarrier.SoitisnoteffectivebyoraladministTation.3'4ItisIikelythatan0n-toxicderivativeofy-arninobutyricacidwhichentersthebraineasilywi1lhaveusefultheraPeuticproperties.Withthisinmind,wehavedesignedandsynthesizedl6derivativesofy-aminobubocacidwithaniminelinktoa1ip0philiccarrierinordert0facilitatethepassage0fy-aminobu…     

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…     

Pr^3＋掺杂的LaF3纳米微晶／氟氧化物玻璃陶瓷的4f5d能级光谱性质

用同步辐射的真空紫外(VUV)和紫外(UV)作为激发源研究了Pr^3 (0．1％)掺杂的LaF3纳米微晶，氟氧化物玻璃陶瓷的4f5d能级光谱性质。样品中存在两种不同的Pr^3 -LaF3微晶中的Pr^3 最低的4f5d能级在^1S0能级之上，玻璃中的却在^S0能级之下，通过VUV和UV激发光谱得出这两种Pr^3 最低的4f5d能级的位置。当用181nm光激发样品时，在发射光谱中同时观察到了微晶中Pr^3 4f^2→4f^2的窄谱带发射和玻璃中4f5d→4f^2的宽谱带发射。在20K时观察到了LaF3纳米微晶中作为Pr^3 光子级联发射(PCE)第二步的^3P0→H4的跃迁，室温下却没有观察到，文中详细讨论了产生这种现象的原因。     

Synthesis of 2S-Hydroxymethyl-3R, 4R-dihydroxypyrrolidine

Manyp0lyhydroxylatedalkaIoidsexhibitglyc0sidaseinhibit0ryactivitiesl.PoIyhyroxylatedpyrroIidineisatypeofimportantalkaloidalglycosidaseinhibit0rs2.Forexample,2R-hydroxymethyl-3R,4R-dihydroxypyrr0lidine(l,4~dideoxy-1,4imin0-D-arabinitoI),anaturallyoccurringp0lyhydroxylatedpyrrolidine',isapotentinhibitorofa-glucosidase'.Promptedbyinterestsintheremarkablephysi0logicaleffects,s0mepolyhydroxylatedpyrrolidineandtheirderivativeshavebeensynthesized".Inthispaper,wedescribethesynthesis0f2Shydroxymeth…     

Preparation of the Phosphors BaAl_2O_4:Eu, RE (RE=Dy, Ho) by Microwave Heating Technique and Observation of Long Phosphorescence

TheMAI=O'fEu= (M=Ca,Sr,Ba)havebeenknowntobeexcelIentphosphorsunderultravioletandcath0de-rayexcitation'-'.Studies0ntheph0sphorswerem0stlypertbrmedinl960sandearlyl970smainlyf0rlampandcathode-raytubeapplicati0n.Inl990sthephosphorSrAl=O#fEu= hasbeenfoundtobeablet0maintainitsaftergl0wf0rafairlylongdurati0n'-'.lnthesereports.MAl=O'fEu' werepreparedmainl}byahightemperaturesolidstatemethod,whichexpendedquitel0ngreacti0ntime0f2-4hatahightemperature0fl20O~l500"Cinareducingatm0sphereandconsumedag…     

Samarium Diiodide-Mediated Reductive Cleavage of Se-Se Bond of Diacyl Diselenides:A New Method for Synthesis of β-Selenoesters

Inrecentyears,theuse0f5-selen0carbonylcompoundsasp0tentialintermediatesinorganicsynthesishasbec0memoreandmorep0pular'-'.Akiraandc0-workersdevel0pedafacilec0njugateaddition0fbenzeneselenoltoa,9-unsaturatedcarb0nylcompounds.Thisprocessrequiress0diumbenzeneselen0late,preparedfromdiphenyldiselenideandsodiumbor0hydride'.Ontheotherhand,itiskn0wnthatdiselenideswereeffectivelyreducedt0theirc0rrespondingselenoleswithcarbonm0n0xideandwater,usingselenium.However,thereactionmustbecarried0utunderhighpressu…