稀土与二苯甲酰甲烷及与安替吡啉三元配合物的合成和性质

稀土与二苯甲酰甲烷及与安替吡啉三元配合物的合成和性质李夏王娓胡秋菊（首都师范大学化学系北京１０００３７）关键词稀土配合物二苯甲酰甲烷安替吡啉安替吡啉具有很好的协同萃取效果［１］。金林培等对二苯甲酰甲烷及与安替吡啉所形成的二元配合物进行了ＩＲ、低温荧光...     

以钛-二安替吡啉甲烷-变色酸三元络合物的形式分光光度法测定钛

变色酸(XK)、二安替吡啉甲烷(дAM)是测定钛的两种重要试剂。近年来ганаго等研究了钛-二安替吡啉甲烷-溴代邻苯三酚红及钛-二安替吡啉甲烷-变色酸的形式分光光度法测定钛。我们对后者进行了研究,经试验发现显色液中有白色针状结晶析出。我们加入了乙醇防止了沉淀析出并对多种离子进行了干扰试验。实验证明本法是一个高选择性、精密度较好的快速分析法。     

7-(4-安替吡啉偶氮)-8-羟基喹-5-磺酸的合成及其与铜的显色反应

7-(4-安替吡啉偶氮)-8-羟基喹啉为安替吡啉单偶氮类试剂中的一种,该试剂可与镓(Ⅲ)、铟(Ⅲ)、铋(Ⅲ)、钯(Ⅱ)、镍(Ⅱ)、钴(Ⅱ)、铜(Ⅱ)、铁(Ⅱ)等离子发生显色反应[1,2].本文在其5位引入磺酸基,合成了7-(4-安替吡啉偶氮)-8-羟基喹啉-5-磺酸(分子式为C20H17N5O5S)试剂.该试剂分子的共轭体系增大,分析功能基及成键原子的电荷密度大大提高,可提高显色反应的灵敏度.文献[3～5]研究表明,8-羟基喹啉-5-磺酸-7-偶氮化合物可能是一类较有价值的光度分析试剂.本文以4-氨基安替吡啉的重氮盐为重氮组分与8-羟基喹啉-5-磺酸进行偶合反应,合成了7-(4-安替吡啉偶氮)-8-羟基喹啉-5-磺酸,产物的结构用红外光谱进行了表征,并研究了该试剂与铜的显色反应.     

DTPM光度法测定含铜较高矿石中的铋

二硫代二安替吡啉甲烷(DTPM)光度法测定铋,铜的允许量低,对于含铜较高的试样,一般采用氨水分离的方法,操作冗长。本文探讨了铜的干扰及消除方法,选用适宜的酸度和掩蔽体系,扩大了铜的允许量。对于含铜较高的试样,提出了一个简易萃取分离的方法,即在比色管中将铋的氯阴离子与二安替吡啉甲烷形成的络合物萃入二氯甲烷中,弃去上层水相后直接在原比色管中用EDTA反萃取并显色。     

镁合金中锌的萃取容量法测定

二安替吡啉甲烷萃取容量法测定锌,已在某些合金中得到应用。本文把该方法应用于镁合金,并进行了条件试验,确定了镁合金中锌的测定方法。本文在2N盐酸介质中,用二安替吡啉甲烷氯仿溶液萃取锌,以抗坏血酸消除铁的影响;在弱酸性溶液中,锌被反萃入水相,用硫脲和氟化钠掩蔽铜和铝等干扰元素,以二甲酚橙为指示剂,用EDTA滴定。用国内、外镁合金标样对本方法进行验证。证明该方法准确、快速、重现性好、操作简便、易掌握。     

金属材料分析方法的选择和施行第四讲 金属材料中钛的测定（续）

2.6.2　二安替比啉甲烷作为显色剂用于钛的测定二安替比啉甲烷(以下简写作DAPM)属离子缔合物形成显色剂,系白色粉状固体,相对分子质量为406.5(含结晶水),熔点为155～157℃,150℃以上试剂分解。试剂微溶于水,但溶于稀酸或氯仿、乙醇等有机溶剂中。在酸性介质中DAPM通过其分子中的羰基-C=O与一个或两个氢离子实现质子化:一般认为,DAPM质子化的阳离子与某些金属络阴离子形成离子缔合型络合物:[Mm+Xn](n-m)-+(n-m)RH+RH+(n-m)·[Mm+Xn](n-m)-式中　Mm+———价态为m+的金属阳离子X———阴离子,如卤素离子或硫氰酸盐等n———金属阳离…     

7-（4-安替吡啉偶氮）-8-羟基喹啉-5-磺酸的合成及其与铜的显色反应

7-（4-安替吡啉偶氮）-8-羟基喹啉为安替吡啉单偶氮类试剂中的一种，该试剂可与镓（Ⅲ）、铟（Ⅲ）、铋（Ⅲ）、钯（Ⅱ）、镍（Ⅱ）、钴（Ⅱ）、铜（Ⅱ）、铁（Ⅱ）等离子发生显色反应。本文在其5位引入磺酸基，合成了7-（4-安替吡啉偶氮）-8-羟基喹啉-5-磺酸（分子式为C20H17N5O5S）试剂。     

以硫醚为主链的螯合树脂研究：Ⅰ.4—氨基安替吡啉树脂和乙基原…

聚环硫氯丙烷或环硫氯丙烷与环氧氯丙烷共聚物，在少量二乙烯三胺存在下制得交联预聚物，将交联预聚物与４－氨基安替吡啉或乙基原磺酸钾反应，制得四种侧链带氨基安替吡啉，乙基原磺酸基的新型螯合树脂它们对贵金属具有优良的吸附性能和高的吸附选择性。并通过Ｘ－射线光电子能谱初步探讨了树脂对金属离子的螯合作用。     

以硫醚为主链的螯合树脂研究Ⅰ.4-氨基安替吡啉树脂和乙基原磺酸基树脂的合成及吸附性能

聚环硫氯丙烷或环硫氯丙烷与环氧氯丙烷共聚物，在少量二乙烯三胺存在下制得交联预聚物，将交联预聚物与4－氨基安替吡啉（4AAP）或乙基原磺酸钾（PEA）反应，制得四种侧链带氨基安替吡啉，乙基原碘酸基的新型螯合树脂。它们对贵金属具有优良的吸附性能和高的吸附选择性。并通过X－射线光电子能谱初步探讨了树脂对金属离子的螯合作用。     

阻抑茜素红S褪色动力学光度法测定痕量汞

在HAc—NaAc介质中,以邻菲啰啉作活化剂,痕量Cr（Ⅵ）对H2O2氧化茜素红S褪色反应存在强烈的催化作用,而Hg（Ⅱ）对此褪色反应具有明显的阻抑作用,由此建立了测定痕量Hg（Ⅱ）的新阻抑动力学光度法。该方法线性范围为0～1．6μg／mL,检出限为2．6×10^-8g／mL,应用于污水中Hg（Ⅱ）的测定,结果满意。     

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.