二（2，6－二叔丁基－4－甲基苯氧基）钐配合物催化甲基丙烯酸甲酯聚合

二（２，６－二叔丁基－４－甲基苯氧基）钐配合物催化甲基丙烯酸甲酯聚合扈晶余，齐贵中（中国科学院长春应用化学研究所稀土化学与物理开放实验室长春１３００２２）沈琪（苏州大学化学系苏州）关键词钐配合物，甲基丙烯酸甲酯，聚合二价稀土有机化合物具有很强的还原性...     

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究

二甲基亚砜在稀土穴醚配合物中配位行为的电化学研究刘世昌（内蒙古师范大学化学系,呼和浩特０１００２２）朱天培（中国科学院长春应用化学研究所,长春１３００２２）有关穴醚与稀土金属离子配合物的性质以及关于它们的电化学方面的研究均尚少￣［１－５］,且不系统。...     

二（叔丁基环戊二烯基）钕甲基配合物催化丙烯腈聚合

二（叔丁基环戊二烯基）钕甲基配合物催化丙烯腈聚合任劲松，扈晶余，沈琪（中国科学院长春应用化学研究所稀土化学与物理开放实验室长春１３００２２）（苏州大学化学系苏州）关键词丙烯腈，配位聚合，钕配合物丙烯腈聚合通常采用ＢＦ＿３、ＴｉＣｌ＿４、过氧化苯甲酰￣...     

二价芳氧钐配合物催化苯乙烯聚合

二价芳氧钐配合物催化苯乙烯聚合齐贵中扈晶余＊沈琪（中国科学院长春应用化学研究所稀土化学与物理开放实验室长春１３００２２）（苏州大学化学系苏州）关键词钐配合物，苯乙烯，聚合１９９６－０５－１８收稿，１９９６－１０－３０修回国家科委攀登计划及国家自然科学...     

铕(Ⅲ)-色氨酸-咪唑三元配合物的电化学行为研究

本文合成了铕（Ⅲ）－色氨酸－咪唑二元及三元配合物,并对配合物进行了红外光谱分析,确定了配合物的成键特征．应用循环伏安法研究了铕（Ⅲ）稀土离子、铕（Ⅲ）与色氨酸及咪唑混合溶液、铕（Ⅲ）二元及三元配合物在玻碳电极上的电化学行为．实验结果表明,在—０．４～—１．０Ｖ（ｖｓ．ＳＣＥ）电位扫描范围内,配体为非电活性物质,铕（Ⅲ）及其与配体的混合溶液以及配合物均显示了准可逆的电子迁移过程．     

[（t—BuCp）2YCH3]2的合成及其对甲基丙烯酸甲酯的催化聚合活性

［（ｔ┐ＢｕＣｐ）２ＹＣＨ３］２的合成及其对甲基丙烯酸甲酯的催化聚合活性扈晶余＊任劲松沈琪（中国科学院长春应用化学研究所稀土化学与物理开放实验室长春１３００２２）（苏州大学化学系苏州）关键词钇配合物，合成，聚合活性，甲基丙烯酸甲酯１９９６－０４－１８...     

Dawson结构钨铌磷杂多配合物183WNMR谱的研究

Ｄａｗｓｏｎ结构钨铌磷杂多配合物~（１８３）ＷＮＭＲ谱的研究龚剑，瞿伦玉，陈亚光，李宝利（东北师范大学化学系，长春１３００２４）张建国（中国科学院长春应用化学研究所，长春１３００２２）关键词：Ｄａｗｓｏｎ结构杂多配合物，钨铌磷杂多配合物，~（１８３）Ｗ...     

固相反应合成卟啉类配合物

固相反应合成卟啉类配合物刘国发，滕永富，师同顺（吉林大学化学系，长春，１３００２３）关键词乙酰丙酮，四苯基取代卟啉，四萘基四苯并卟啉，稀土配合物镧系卟啉配合物是通过在高沸点溶剂或熔融咪唑中反应并进行较为复杂的分离和纯化后而得到的［１］．由于合成条件苛...     

稀土与甘氨酰－L－亮氨酸的配位作用

用ｐＨ电位法测定了生理条件下（３７℃，Ｉ＝０．１５ｍｏｌ／Ｌ）和２５℃，Ｉ＝０．１０ｍｏｌ／Ｌ时甘氨酰－Ｌ－亮氨酸的质子化常数及其稀土配合物稳定常数，结果表明稀土可与该配体形成１：１配合物，并且配合物稳定性呈现明显“四分组效应”。讨论了钇的位置以及肽键对配合物稳定性的影响。     

稀土与甘氨酰—L—亮氨酸的配位作用

用ｐＨ电位法测定了生理条件（３７℃，Ｉ＝０．１５ｍｏｌ／Ｌ）和２５℃，Ｉ＝０．１０ｍｏｌ／Ｌ时甘氨酰Ｌ－亮氨酸的质子化常数及其稀土配合物稳定常数。结果表明稀土可与该配体形成１：１配合物，并且配合物稳定性呈现明显“四分组效应”。讨论了钇的位置以及肽键对配合物稳定性的影响。     

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.