偏最小二乘光度法同时测定多种酚的研究有应用

利用Ｃｕ（Ⅱ）、吡啶能与酚形成稳定的三元配合物的特点，研究了Ｃｕ（Ⅱ）－吡啶－酚三元显色新体系，并以偏最小二乘法建立模型预测，同时测定了模拟水样和环境水样中的对苯二酚、间苯二酚、邻苯三酚和对硝基苯酚，取得满意效果。     

Cu（Ⅱ）—茜素红S—甲基紫—聚乙烯醇体系光度测定痕量铜

提出了Ｃｕ（Ⅱ）－茜素红Ｓ－甲基紫－聚乙烯醇三元配合物体系光度法测定Ｃｕ（Ⅱ）的新方法，在聚乙烯醇存在的下，Ｃｕ（Ⅱ）－茜素红Ｓ－甲基紫形成稳定的有色配合物，通过测定该化合物的吸光度而测定Ｃｕ（Ⅱ）含量，测定了天然水样，试验表明，方法有较好的灵敏度和选择性，精密度可靠，适用于水样中痕量Ｃｕ（Ⅱ）的测定。     

中位—四（4—N—氰甲基吡啶）卟啉—铜（Ⅱ）络合物及其与脱氧核糖核酸…

本文在银胶活性基质上获得了Ｃｕ（Ⅱ）的中位－四（４－Ｎ－氰甲基吡啶）卟啉络合物Ｃｕ（Ⅱ）ＮＡＣＮ的表面增强喇曼光谱光谱，并与其ＲＲＳ光谱作了比较，讨论了ＰＨ值和Ｃｕ（Ⅱ）ＮＡＣＮ的复合物的ＳＥＲＳ光谱的影响，研究了小牛胸腺双链ＤＮＡ及其变性ＤＮＡ与Ｃｕ（Ⅱ）ＮＡＣＮ的复合物的ＳＥＲＳ光谱，指出Ｃｕ（Ⅱ）ＮＡＣＮ是通过吡啶氮和卟啉核共同与银胶作用的，Ｃｕ（Ⅱ）ＮＡＣＮ是斜向吸附在银表面上的，最佳ＰＨ     

铜（Ⅱ）－4－（吡啶－2′－甲基）－1，4，7，10－四氮杂环十三烷－11，13－二酮－α－氨基酸（5－取代邻菲罗啉）三元配合物的稳定性研究

用ｐＨ法在２５．０±０．１℃，Ｉ＝０．１ｍｏｌ·ｄｍ－３ＫＮＯ３条件下，测定铜（Ⅱ）－４－（吡啶－２′－甲基）－１，４，７，１０－四氮杂环十三烷－１１，１３－二酮－α－氨基酸（５－取代邻菲罗啉）三元配合物的稳定常数；比较了带吡啶甲基二氧四胺大环配体和二氧四胺大环配体与Ｃｕ（Ⅱ）的配位能力、配位方式；研究了该三元体系配合物稳定性与配体α－氨基酸酸碱强度之间的直线自由能关系；探讨了Ｃｕ（Ⅱ）和５－取代邻菲罗啉之间的ｄ－ｐ反馈π键以及邻菲罗啉取代基Ｈａｍｍｅｔｔ诱导效应与该三元配合物稳定性之间的关系。讨论了４－（吡啶－２′－甲基）－１，４，７，１０－四氮杂环十三烷－１１，１３－二酮和４－（喹啉－２′－甲基）－１，４，７，１０－四氮杂环十三烷－１１，１３－二酮与Ｃｕｘｐｈｅｎ所形成配合物的不同空间结构及其对配合物稳定性产生的影响。     

Cu（Ⅱ）NEAE和Cu（Ⅱ）NACN的NIR FT－SERS光谱研究

用沉积银胶的银镜作活性载体，获得了中位－四－（４－Ｎ－乙氧羧甲基吡啶）卟啉络铜（Ⅱ）（Ｃｕ（Ⅱ）ＮＥＡＥ）、中位－四－（４－Ｎ－氰甲基吡啶）卟啉络酮（Ⅱ）（Ｃｕ（Ⅱ）ＮＡＣＮ）的近红外富里叶变换－表面增强喇曼光谱（ＮＩＲＦＴＳＥＲＳ），对其谱峰位移作了归属，并与它们的可见激光表面增强共振喇曼光谱（ＳＥＲＲＳ）作了比较。     

三吡啶胺和四齿链酚胺配体与Cu(Ⅱ)配位性质及其配合物催化酯水解研究

运用 ｐＨ电位滴定法,在 ２５±０．１℃　Ｔ, Ｉ＝０．１（ＫＮＯ_３）条件下,研究了 Ｃｕ（Ⅱ）与三吡啶胺（Ｌ’）和队（２’－羟基苄基）－二乙二胺（ＨＬ~２）的配位行为。结果表明,Ｌ’以二齿的形式和 Ｃｕ（Ⅱ）形成稳定的 ２：１（Ｌ： Ｍ）配合物。其配位水分子的离解常数 ｐ Ｋａ为 ７．５４。对于 ＨＬ~２,三个氮原子和酚氧负离子与 Ｃｕ（Ⅱ）配位,酚羟基离解常数 ｐ Ｋａ为４．４４。在２５±０．１℃,Ｉ＝０．１（ＫＮＯ_３）条件下,ｐＨ＝６～９（５０ｍｏｌ·Ｌ~（－１））范围内,用紫外、可见分光光度法研究了Ｌ~１的Ｃｕ（Ⅱ）配合物催化对－硝基苯酚乙酸酯（ＮＡ）水解动力学行为,发现配合物催化ＮＡ酯水解反应速率常数ｋ_（ＮＰ）与溶液 ｐＨ呈 Ｓｉｇｍｏｉｄａｌ型曲线, ｋ_（ＮＰ）最大值为 ２． ５３×１０~（－２）Ｌ· ｍｏｌ(－１)· ｓ(－１)。说明 Ｌ~１的 Ｃｕ（Ⅱ）配合物中的 Ｃｕ（Ⅱ）－ＯＨ~－是有效的亲核试剂,对底物ＮＡ酯的水解有较好的催化作用。     

铜(Ⅱ)与苯基羧酸(HPCA)和2,2''''-联吡啶衍生物(dpx)混配配合物的合成和表征

合成了铜（Ⅱ）与苯基羧酸根［ＰＣＡ－＝苯甲酸根（Ｂｚ－），２－苯乙酸根（ＰＡｃ－），３－苯丙酸根（ＰＰｒ－），４－苯丁酸根［ＰＢｕ－）］和２，２′－联吡啶衍生物（ｄｐｘ：２，２′－联吡啶胺ｄｐａ、２，２′－联吡啶酮ｄｐｋ、２，２′－联吡啶甲烷ｄｐｍ）三大系列１２种新的三元配合物。用元素分析、摩尔电导、红外光谱、１Ｈ核磁共振、差热分析等实验方法表征了它们的组成和性质。确定该系列配合物化学组成为Ｃｕ（ＰＣＡ）２（ｄｐａ）、Ｃｕ（ＰＣＡ）２（ｄｐｍ）、Ｃｕ（ＰＣＡ）２（ｄｐｋ）·ｎＨ２Ｏ（ｎ＝２－４）。它们具有相似的组成和配位方式。它们的可能结构为：二个ＰＣＡ－与Ｃｕ（Ⅱ）单齿配位，一个ｄｐｘ与Ｃｕ（Ⅱ）Ｎ，Ｎ二齿螯合配位。ｄｐｋ的羰基在金属离子Ｃｕ２＋的存在下发生水化作用成ｄｐｋ·Ｈ２Ｏ。用１ＨＮＭＲ法研究了Ｃｕ（Ｂｚ）２（ｄｐｘ）·ｎＨ２Ｏ和Ｃｕ（ＰＡｃ）２（ｄｐｘ）·ｎＨ２Ｏ二个体系其分子内或分子间可能存在的非共价键作用。     

噻吩甲酰三氟丙酮和4,5-二氮芴-9-酮及4,5-二氮芴-9-酮连氮铕(Ⅲ)三元配合物的合成和表征

合成了Ｅｕ（ＴＴＡ）３Ｌ１（Ⅰ）和［Ｅｕ（ＴＴＡ）３］２Ｌ２（Ⅱ）二种新的铕（Ⅲ）三元配合物（ＴＴＡ＝噻吩甲酰三氟丙酮一价阴离子、Ｌ１＝４，５－二氮芴－９－酮、Ｌ２＝４，５－二氮芴－９－酮连氮）。用元素分析、ＩＲ、ＵＶ和溶液荧光光谱对配合物进行了表征。探讨了溶剂对Ｅｕ（Ⅲ）三元配合物荧光光谱的影响，发现在ＣＨ３ＣＮ中Ｅｕ（Ⅲ）三元配合物发光效果最好，而溶剂ＤＭＦ会使配合物荧光减弱     

含硼—氮配键漆酚高分子铜（Ⅱ）：配合物的特性及其表征

含硼－氮配键漆酚高分子与氯化铜的反应产物ＰＵＢＮ－Ｃｕ（Ⅱ）在亚硫酸钠水溶液中能使甲基丙烯酸甲酯于室温下聚合。用红外光谱、Ｘ射线光电子能谱、高效液相色谱等方法对ＰＵＢＮ－Ｃｕ（Ⅱ）进行了表征，并探讨了其引发甲基丙烯酸甲酯聚合的特性和机理。     

螯合树脂研究（XXVI）氮杂冠醚型树脂的合成及其只附性能

用环氧氯丙烷低聚物分别与二（三）乙醇胺的钠盐进行反应，合成了两种氨杂冠醚型交联树脂，研究了树脂对贵金属和一些ｄ－过渡金属的吸附性能，树脂Ａｕ（Ⅲ）具有较高的吸附容量和吸附率。在Ｃｕ（Ⅲ）－Ｐｄ（Ⅱ）－Ｐｔ（Ⅳ）混合液中优先吸附Ａｕ（Ⅲ）；在Ｃｕ（Ⅱ）－Ｚｎ（Ⅱ）和Ｃｕ（ｗ）－Ｃｏ（Ⅱ）－Ｎｉ（Ⅱ）的混合液中只吸附Ｃｕ（Ⅱ）而不吸附其他金属离子。     

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.