硫酸铵—锌试剂—Tween—80体系萃取分离铜（Ⅱ）,钴（Ⅱ）,镍（Ⅱ）,锌（ …

研究了（ＮＨ４）２ＳＯ４－Ｚｉｎｃｏｎ（锌试剂）－Ｔｗｅｅｎ－８０体系萃取分离金属离子Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｍｎ（Ⅱ）的行为。试验表明,Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）在ｐＨ６￣９范围内,与Ｚｉｎｃｏｎ形成的螯合物可被Ｔｗｅｅｎ－８０相完全萃取,而Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｍｎ（Ⅱ）基本不被萃取,进而实现了Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）与Ｚｎ（Ⅱ）、Ｃｄ（     

硫酸铵—锌试剂—Tween80体系萃取分铜铜（Ⅱ）,钴（Ⅱ）,镍（Ⅱ）,锌（？…

研究了（ＮＨ４）２ＳＯ４－Ｚｉｎｃｏｎ（锌试剂）－Ｔｗｅｅｎ８０体系萃取分离金属离子Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｍｎ（Ⅱ）的行为。试验表明,Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）在ＰＨ－６－９范围内,与Ｚｉｎｃｏｎ形成的螯合物可被Ｔｗｅｅｎ８０相完全萃取,而Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）基本不被萃取,进而实现了Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）与Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｍｎ（０     

硫酸铵-硫氰酸铵-乙醇体系萃取浮选 Cu(Ⅱ)

研究了在少量抗坏血酸存在下,硫酸铵－硫氰酸铵－乙醇体系萃取浮选Ｃｕ（Ⅱ）的行为。Ｃｕ（Ⅱ）被抗坏血酸还原为Ｃｕ（Ⅰ）后能与ＳＣＮ－生成ＣｕＳＣＮ沉淀。该沉淀可以被萃取浮选在乙醇与水两相界面之间。ＰＨ１～４时,能使Ｃｕ（Ⅱ）与常见离子Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｍｎ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｃｒ（Ⅲ）、Ｍｏ（Ⅳ）分离。     

用Tween80—硫酸铵—1—（2—吡啶偶氮）—2—萘酚—磺酸体系萃取马（Ⅱ）,钴 …

研究了Ｔｗｅｅｎ８０水溶液在（ＮＨ４）２ＳＯ４存在下,水溶性螯合剂１－（２－吡啶偶氮）－２－萘酚－磺酸与金属离子螯合物在该体系中两相间的分配行为。结果表明,Ｐｄ（Ⅱ）,Ｃｏ（Ⅱ）,在ｐＨ２．０－３．５缓冲溶液中可被Ｔｗｅｅｎ相完全萃取,而Ｚｎ（Ⅱ）,Ｃｄ（Ⅱ）,Ｍｎ（Ⅱ）,Ａｌ（Ⅲ）基本上不被萃取。     

用聚乙二醇—硫酸铵—铝试剂体系萃取分离铁（Ⅲ）铝（Ⅲ）,铜（Ⅱ）钴（Ⅱ）…

研究了在聚乙二醇－硫酸铵－铝试剂体系中Ｆｅ（Ⅲ），Ａｌ（Ⅲ）、Ｃｕ（Ⅱ）、ＣｏⅡ）Ｃｄ（Ⅱ）Ｍｎ（Ⅱ）、Ｎｉ（Ⅱ）的萃取分离行为。结果表明，在ＰＨ５．０－６．５ＨＡｃ－ＮａＡｃ缓冲溶液中，Ｆｅ（Ⅲ）、Ａｌ（Ⅲ）可被ＰＥＧ相几乎完全萃取，而Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）Ｃｄ（Ⅱ）Ｍｎ（Ⅱ）基本上不被萃取，从而实现了Ｆｅ（Ⅱ）与Ｃｕ（Ⅱ）Ｃｏ（Ⅱ）Ｃｄ（Ⅱ）Ｍｎ（Ⅱ)及Ａｌ（Ⅲ）与Ｆｅ（Ⅲ）Ｃｏ（Ⅱ）、Ｃｕ（     

液—液萃取浮选法分离Ni（Ⅱ）,Co（Ⅱ）,Fe（Ⅲ）的研究

研究了在（ＮＨ４）２ＳＯ４存在下，乙醇与水分相的条件。试验表明，丁二酮肟与镍生成的螯合物沉淀可以被萃取浮选在乙醇与水两相之间，钴与丁二酮肟生成的螯合物被乙醇萃取，Ｆｅ（Ⅲ）留在水相中，实现了同一体系中三相分离Ｎｉ（Ⅱ），Ｃｏ（Ⅱ），Ｆｅ（Ⅲ），结果满意。     

聚乙二醇—硫酸铵—亚硝基R盐体系中钴（Ⅱ）的分离及其存在形态

在ｐＨ４．０～６．０的ＨＡｃ－ＮａＡｃ缓冲溶液中，Ｃｏ（Ⅱ），Ｆｅ（Ⅲ），Ｎｉ（Ⅱ），Ｃｕ（Ⅱ）等金属离子与亚硝基Ｒ盐可形成稳定络合物，加入ＨＣｌ适当提高溶液酸度（ＨＣｌ浓度在０．３～０．６ｍｏｌ／Ｌ）用聚乙二醇２０００（ＰＥＧ）－硫酸铵－亚硝基Ｒ盐体系萃取，Ｃｏ（Ⅱ）可被ＰＥＧ相几乎完全萃取，而Ｆｅ（Ⅲ），Ｎｉ（Ⅱ），Ｃｕ（Ⅱ）基本上不被萃取，实现了Ｃｏ（Ⅱ），Ｆｅ（Ⅲ），Ｎｉ（Ⅱ），Ｃｕ（Ⅱ）     

硫酸铵存在下碘化钾-抗坏血酸-乙醇体系萃取浮选铜(Ⅱ)

研究了（ＮＨ４）２ＳＯ４存在下,ＫＩ－抗坏血酸－乙醇体系萃取浮选Ｃu（Ⅱ）的行为 。试验表明,Ｉ＾－与被抗坏血酸还原的Ｃu（Ｉ）形成ＣuＩ沉淀能萃取浮选在乙醇／水两相之间。当溶液pＨ１～５时,能使Ｃu（Ⅱ）与Ｆe（Ⅲ）．Ｃo（Ⅱ）、Ｎi（Ⅱ）、Ｍn（Ⅱ）、Ｚn（Ⅱ）Ａl（Ⅱ）、Ｃu（Ⅲ）、Ｍo（Ⅵ）、Ｃd（Ⅱ）分离。     

5,10,15,20—四（3—溴—4—磺酸苯基）卟啉高效液相色谱法测定河水中微量…

研究了新合成的显色剂５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉与Ｃｏ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）形成配合物离子的反应，在ＺＯＲＢＡＸ ＯＤＳ柱上，用含２０ｍｍｏｌ／Ｌ乙酸－乙酸钠（ｐＨ６．０）和１０ｍｍｏｌ／Ｌ四乙基碘化铵的乙腈－水（２７：７３，Ｖ／Ｖ）流动相洗脱，在４２０ｎｍ波长下检测。Ｃｏ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｕ（Ⅱ）螯合物在９ｍｉｎ内获得完全分离，检测限分别为０．２ｎｇ，０．０５     

用聚乙二醇—硫酸铵—铬黑T体系从铁（Ⅲ）,钴（Ⅱ）,镍（Ⅱ）,铜（Ⅱ）中萃取…

本研究了聚乙二醇（ＰＥＧ）－（ＮＨ４）２ＳＯ４－铬黑Ｔ（ＥＢＴ）体系对Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）、Ｃｄ（Ⅱ）的非有机溶剂萃取行为。结果表明，在ｐＨ７￣１１的ＮＨ３·ＨＮＨＣｌ缓冲溶液中，Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）可被聚乙二醇（ＰＥＧ）相萃取，而Ｃｄ（Ⅱ）基本上不被萃取，从而获得了Ｃｄ（Ⅱ）与Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）、Ｃｕ（Ⅱ）混合离子的定量分离。     

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.