全氟磺酸树脂Nafion NR50溶解的制备

研究了全氟磺酸树脂NafionNR50溶液的制备过程,通过考察不同的溶剂 体系,得到了5种对NafionNR50具有良好溶解作用的溶剂体系,即40％－70％水＋60％－30％乙醇、40％－70％水＋60％－30％正丙醇、10％－70％水＋90％－30％异丙醇、30％－70％水＋60％－20％正丙醇＋10％甲醇和10％－70％水＋80％－20％异丙醇＋10％甲醇。适宜的溶解温度为230－250℃,溶解时间为4h。在溶解的过程中,NR50催化醇发生异构化、醚化和脱水等反应,甲醇起到促进NR50溶胀进而加速其溶解的作用。     

一种新型的芳基重排反应（Ⅱ）──苯并环己酮中β－芳基的重排

报道了３－芳基四氢合萘－１－酮的烯醇硅醚在氧化碘苯－三氟化硼的协同作用下３－位芳基迁移到２－位，生成２－芳基－３－氟四氢合萘－１－酮的反应。当芳基是Ｐｈ－ｐ－Ｃｌ－Ｐｈ、ｐ－Ｍｅ－Ｐｈ和ｐ－ＭｅＯ－Ｐｈ时，收率分别为８０％、６１％、１０％和５％，并讨论了这一反应的机理。     

催化极谱法测定产妇、新生儿全血和胎盘中的微量钼

在０－２２５ ｍｏｌ／ＬＨ２ＳＯ４ － ０－２５ ％ 苯羟乙酸－ ３ ％ ＫＣ１Ｏ３ 底液体系中, 钼有一个灵敏的极谱催化波, 用于测定临床样品中的Ｍｏ , 其峰电位－ ０－３０ Ｖ（ 对Ｓ－Ｃ－Ｅ） 。２３ 种共存离子的含量低于允许存在量, 不干扰测定。方法的检出限１－４ ×１０ － １０ ｇ／ｍＬ, 线性范围０－００１ ～０－５００ ｍｇ／Ｌ, １１ 次测定的相对标准偏差为１－８９ ％ ～３－４２ ％ , 标准回收率９７－２ ％ ～１０２－８ ％ 。方法简便、快速。测定了西宁市３５ 例分娩孕妇全血、新生儿脐血和胎盘中的钼, 获得了理想的结果。     

一种新型的芳基重排反应（Ⅱ）—苯并环己酮中β—芳基的重排

报道了３－芳基四氢合萘－１－酮的烯醇硅西边在氧化碘苯－三氟化硼的协同作用下３－位芳基迁移到２－位，生成２－芳基－３－氟四氢合萘－１－酮的反应。当芳基是Ｐｈ－ｐ－Ｃｌ－Ｐｈ、ｐ－Ｍｅ－Ｐｈ和ｐ－ＭｅＯ－Ｐｈ时，收率分别为８０％、６１％、１０％和５％，并讨论了这一反应的机理。     

气相色谱法测定环境空气和废气中的2-丁酮和苯

用活性炭吸附环境空气和废气中的2－丁酮和苯，经二硫化碳解吸后用气相色谱法测定。方法的回收率2－丁酮为86．2％－104．6％， 为91．3％－105．7％。相对标准偏差2－丁酮为2．5％－2．8％，苯为2．5％－3．8％，当采样体积为20L，解吸液体积为2.00ml，进样体积为2μl时，2－丁酮和苯的最低检测浓度分别为0.03mg.m^-3和0.01mg.m^-3。     

应用微波辐射技术一步合成4－芳基－1，4－二氢吡啶衍生物

以芳醛、乙酰乙酸乙酯、醋酸铵为原料在无溶剂条件下应用微波技术合成了4 －芳基－2，6－二甲基－3－5－二乙氧羰基－1，4－二氢吡啶，该反应的2－5min 内完成，产率73％－99％。     

用色谱-质谱和质量色谱研究苯甲酸钐热分解反应

为合成某些芳香族有机化合物提供一种新途径，用色谱－质谱联用技术和质量色谱法研究了苯甲酸钐的热分解反应产物。其热分解产物溶入丙酮后有大量９，１０－蒽醌析出，其丙酮溶液中还含有１，２－二苯甲酰基苯（２５６％）、苯甲酸（１８７％）、二苯酮（１４４％）、９－芴酮（８２％）、９－苯基芴（４９％）、联苯（３６％）、二苯甲烷（２３％）、３－甲酰苯基联苯（２１％）、二苯基乙二酮（１９％）、４－甲酰苯基联苯（１８％）、芴（１７％）、ｍ－二苯甲酰基苯（１１％）和ｐ－二苯甲酰基苯（０２％）等５５种化合物。讨论了苯甲酸盐的热分解反应机理。     

Mg的添加对Mo／ZSM－5催化剂催化甲烷芳构化性能的影响

 通过XRD，N2吸附和吡啶FT－IR等方法考察了Mg的添加对Mo／ZSM－5催化剂物化性质的影响．吡啶FT－IR结果表明，Mo－Mg／ZSM－5催化剂上Lewis酸中心与Br¨onsted酸中心的比值随着Mg添加量的增加而增大．在甲烷芳构化反应中，虽然催化剂上的积碳量随着Mg含量的增加而减少，但只有6％Mo－0．75％Mg／ZSM－5催化剂表现出比6％Mo／ZSM－5催化剂更好的稳定性，6％Mo－2％Mg／ZSM－5和6％Mo－3％Mg／ZSM－5两个催化剂的稳定性均比6％Mo／ZSM－5催化剂差．根据催化剂稳定性与酸性的关系提出，在有足够Br¨onsted酸中心存在的前提下，可以通过调变Lewis酸中心和Br¨onsted酸中心的比值来提高催化剂的稳定性．     

动力学—两次标准加入法同时测定钼和钨

本文提出了动力学－两次标准加入法双组份同时测定的新方法，讨论了测定的基本原理；用停流ＦＩＡ光度法研究了钼和钨共同催化的Ｈ２Ｏ２－Ｉ＾－动力学反应体系，并建立了钼和钨同时测定的条件，用本法测定了钢样和模拟样品中的钼、钨含量，结果满意，钼和钨的回收率分别为９７％－１０２．６％和９８．２％－１０３％；相对标准偏差分别为２．８％－３．２％和２．１％－３．５％。     

微型镉柱还原分光光度法测定血清中一氧化氮

建立了微型镉柱还原法间接测定血清中一氧化氮的新方法。本方法还原硝酸根所需时间短，还原率达９５％以上，用于测定混合血清中一氧化氮。检测范围为０－１０００μｍｏｌ／Ｌ，相对标准偏差为１．７０％－２．４９％，对ＮＯ＾－３的回收率为９５．８％－１０４．０％，对ＮＯ＾－２的回收率为９３．６％－９６．８％。     

二氧化碳和丙烯直接合成甲基丙烯酸的NiPMo/TiO2催化剂的研究

用溶胶-凝胶法以磷钼酸(MPA)的镍盐溶液水解钛酸四丁酯制备了NiPMo/TiO2催化剂.使用ICP、 XRD、 TG-DTA、 IR、 TPD-MS和微反应技术研究了催化剂的化学组成、热稳定性、化学吸附性质和催化反应性能.杂多钼酸盐与TiO2通过O2-在TiO2表面发生了键合.在623 K下,杂多阴离子仍保持原有的Keggin结构.CO2在Lewis酸位Ni(Ⅱ)和Lewis碱位Ni-O-Mo的桥氧协同作用下生成CO2卧式吸附态Ni(Ⅱ)←O-(CO)←(O--Ni).丙烯有多种吸附态在催化剂上吸附.在563 K、 1 MPa和空速1500 h-1的反应条件下,丙烯的摩尔转化率为3.2%,产物MAA选择性为95%.     

Synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives

Different approaches for the synthesis of 1-benzyloxypyrazin-2(1H)-one derivatives from simple amino acids have been investigated. A library of 33 precursors for the preparation of N-hydroxy pyrazinones was obtained in moderate to good yields.     

Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction

In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated as by-products of some experiments.     

CoFe2O4自形成磁性液体场致结构化对磁化的影响

The Langevin paramagnetic theory can’t describe the relation between magnetization of ferrofluids and applied magnetic field. The structuralization of ferrofluids, which is considered the main influence factor of the magnetization, is regarded. The part of magnetization works is deposited when the structure is forming. This action influences the magnetization of ferrofluids directly or indirectly. On the base of the “compressing” model, the Langevin function that usually describes the magnetization of ferrofluid is modified, and a well-fitted curve is obtained. An equation of the relation between the equivalent volume fraction after being “compressed” and the intensity of magnetic field is discovered, which approximately describes the process of magnetization. The relation between the approximate initial susceptibility and the volume fraction can be obtained from modified formula.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

KMnO4-mediated oxidative CN bond cleavage of tertiary amines: Synthesis of amides and sulfonamides

KMnO₄-mediated oxidative CN bond cleavage of tertiary amines producing secondary amine was introduced, which was trapped by electrophiles (acyl chloride and sulfonyl chloride) to form amides and sulfonamides. The reaction could take place at mild condition, tolerating a wide range of function groups and affording products in moderate to excellent yields.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.     

A general and convenient synthesis of 4-(tosylmethyl)semicarbazones and their use in amidoalkylation of hydrogen,heteroatom, and carbon nucleophiles

A general synthesis of previously unknown semicarbazone-based α-amidoalkylating reagents, 4-(tosylmethyl)semicarbazones, has been developed. The synthesis involved three-component condensation of semicarbazones of aliphatic or aromatic aldehydes with the same or other aldehydes and p-toluenesulfinic acid. The scope and limitations of this reaction were investigated. The compounds obtained were demonstrated to be an efficient α-(4-semicarbazono)alkylating agents. They were reacted with H- (sodium borohydride), O- (sodium methylate), S- (sodium phenylthiolate), N- (pyrrolidine, sodium succinimide), P- (trialkyl phosphites), and C-nucleophiles (sodium diethyl malonate) to give the corresponding products of the tosyl group substitution, 4-substituted semicarbazones, including analogues of nitrofurazone. Among the prepared compounds tested in vitro for antibacterial and antifungal activity, three nitrofuryl-containing semicarbazones exhibited high biological activities with minimum inhibitory concentration (MIC) values of 8–32 μg/mL.     

Sulfur-directed metal-free and regiospecific methyl C(sp3)–H imidation of thioanisoles

Regiospecific and direct imidation of the methyl C(sp³)–H bond of thioanisoles is realized under mild and metal-free conditions with N-fluorobis(benzenesulfonyl)imide as an oxidant and nitrogen source. Proposed mechanism suggests that thionium ion intermediates and a Pummerer-type reaction are involved. The imidation has advantages such as high step-economy, excellent functionality tolerance, and regiospecificity, giving structurally diverse imidation products.     

Synthesis of novel chiral bidentate hydroxyalkyl-N-heterocyclic carbene ligands and their application in palladium-catalyzed Mizoroki–Heck couplings and asymmetric addition of diethylzinc to benzaldehyde

A small library of new chiral bidentate hydroxyalkyl-imidazolium salts 1 is conveniently synthesized on multi-gram scale from inexpensive and commercially available chiral pool amino acids. The corresponding carbenes, generated by deprotonation of imidazolium salts 1, in combination with palladium(II) chloride were tested in the Mizoroki–Heck coupling reaction. The most significant results in terms of yields and reactivities were achieved with low catalyst loading. The catalytic activities of these imidazolium salts were also investigated in the asymmetric addition of diethylzinc to benzaldehyde. The use of MgO nanoparticles as an additive in conjunction with these ligands played a crucial role in increasing the efficiency of these reactions.