镉—溴化物—罗丹明B高灵敏显色反应的研究：离心光度法测定镉

本研究了一个高灵敏的测定镉的方法，离心光度法，该体系络合物λｍａｘ＝５６０ｎｍ，表观摩尔吸系数ε５６０＝５．０６×１０＾８Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｄ＾２＋浓度０．１０×１０＾－２－１．０×１０＾－２μｇ／１０ｍＬ呈线性关系，本法已用于血清和水中痕量镉的测定，探讨了高灵敏的显色反应机理。     

新试剂苯并噻唑重氮氨基偶氮苯与镉的显色反应研究及其应用

在Ｔｒｉｔｏｎ Ｘ－１００存在下，ｐＨ９．０－１０．０时，新试剂苯并噻唑重氮氨基偶氮苯与镉形成３：１的橙红色络合物，最大吸收波长位于５３０ｎｍ，表观摩尔吸光系数为１．９１×１０＾－５Ｌ．ｍｏｌ＾－１；ｃｍ＾－１，镉量在０－１２μｇ／２５ｍＬ范围内遵守比尔定律。在混合掩蔽剂存在下，显色反应具有良好的选择性，直接应用于工业废水中微量镉的测定，获得了满意的结果。     

安替比林基重氮基—2,4—二硝基苯及其与镉的显色反应

合成了安替比林基重氮氨基－２，４－二硝基苯（ＡＰＤＮＢＴ）新试剂，并首先研究了它的分析性质及其与镉的显色反应。在ＴｒｉｔｏｎＸ－１００存在下，试剂的两级质子离解常数的ｐＫａ值分别是０．８和１０．８；在ｐＨ＝１０．２～１２．０的Ｂ－Ｒ缓冲溶液中，试剂与镉生成１：２的黄色配合物，呈褪色反应，吸光度差值最大的波长为５４０ｎｍ，其表观摩尔吸光系数为１．５２×１０＾５Ｌ／（ｍｏｌ．ｃｍ），线性范围每２５ｍＬ     

显色试剂6—硝基—苯并噻唑重氮氨基偶氮苯的合成及与镉的显色反应

合成了新的显色试剂６－硝基－苯并噻唑重氮氨基偶氮苯，并研究了在乳化剂ＯＰ存在下马镉的显色反应。镉与试剂于ｐＨ ９．０～１０．０的缓冲介质中形成稳定的红色络合物，表观摩尔吸光系数 ε５２６＝２． ４５ × １０５Ｌ·ｍｏｌ－１·ｃｍ－１，镉浓度在０～ ０． ５ ｍｇ／Ｌ范围内符合比尔定律。该方法灵敏度高，选择性好，并用于废水和环境水样中的微量镉的测定。     

2—[2‘—苯并噻唑偶氮]—1,8—二羟基萘—3,6—二磺酸的合成及与铝的显…

本合成了新的显色试剂２－［２＇－苯并噻唑偶氮］－１，８－二羟基萘－３，６－二磺酸，并研究了与铝的显色反应，在ＣＴＭＡＢ存在下，铝与试剂于ＰＨ７．０－８．０的缓冲溶液中的形成稳定的深紫红色络合物，组成为Ａｌ（Ⅲ）：Ｒ＝１：２，表观摩尔吸光系数为１．４６×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，铝浓度在０－５．０μｇ／２５ｍＬ范围内符合比尔定律。     

镉—双硫腙—CTMAB显色体系的研究及应用

研究了阳离子表面活性剂ＣＴＭＡＢ存在下，镉与双硫腙显色反应的条件及配合物的组成，在０．１６ｍｏｌ／Ｌ的ＮａＯＨ介质中，镉与双硫腙形成一红色配合物，该配合物的λｍａｘ＝５４０ｎｍ，ε５４０＝８．８９×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１镉与双硫腙的配合比为１：３，镉量在０～２５μｇ／２５ｍＬ范围内符合比尔定律，方法用于水样中镉的测定，获得满意结果。     

新显色剂—6硝基—苯并噻唑重氮氨基偶氮苯与汞的显色反应及其应用研究

研究了新显色试剂６－硝基－苯并噻唑重氮氨基偶氮苯与Ｈｇ（Ⅱ）的显色反应。在乳化剂ＯＰ存在下，于ｐＨ１０．０的缓冲溶液中，Ｈｇ（Ⅱ）与显色剂形成１：２的稳定红色络合物。络合物的λｍａｘ＝５１５ｎｍ，其表观摩尔吸光系数为１．５３×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，Ｈｇ（Ⅱ）含量在０￣５μｇ／１０ｍＬ范围符合比尔定律，样品分析结果令人满意。     

2—[2‘—（6—溴—苯并噻唑）—偶氮]—1,8—二羟基萘—3,6—二磺酸的合成及…

本合成了一种新的苯并噻唑类显色试剂－－２－〔２′－（６－溴－苯并噻唑）－偶氮〕－１，８－二羟基萘－３，６－二磺酸（简称Ｂｒ－ＢＴＣＡ），并研究了其与钛的显色反应。在ＣＴＭＡＢ存在下，钛与试剂形成稳定的络合物，其ε６１６＝１．１５×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，组成为Ｔｉ（Ⅳ）：Ｒ：＝１：１，钛浓度在０－０．５ｍｇ／Ｌ范围内符合比尔定律，该方法灵敏度高，选择性好，并用于铝合金及硅铁试样中微     

安替比林基重氮氨基—2,4—二硝基苯与银（I）的显色反应及其应用

本文报道了安替比林基重氮氨基－２，４－二硝基苯（ＡＰＤＮＢＴ）与银（Ｉ）的显色反应，在吐温－８０存在下，ＰＨ＝９．０－１０．０的范围内，试剂与银（Ｉ）形成２：１的配合物；配合物对试剂的最大吸收在４８５ｎｍ处，ε为７．２×１０＾４Ｌ＾－１．ｍｏｌ．ｃｍ＾－１提出了消除阳离子干燥的银镜分离法；方法用于洞察工样及照相显影液中银的含是一定回收率为９６－１０３％，相对标准偏差小于２．０％。     

新显色剂二胺替比林基—4—羟基苯基甲烷与铈（Ⅳ）的显色反应

合成了二安替比林基－４－羟基苯基甲烷。研究了它与铈的显色反应，在稀磷酸介质和Ｔｗｅｅｎ－６０存在下，试剂与铈生成橙红色化合物，λｍａｘ＝４５０ｎｍ，ε＝６．８＊ｄ１０＾ｄ５Ｌ．ｍｏｌ＾－１．ｃｍ，Ｃｅ（Ⅳ）量在０．１－０．８μｇ／２５ｍＬ间符合比尔定律。用于镁合金和锌矿石中微量铈的测定，结果满意。     

α-Amino acid derived enaminones and their application in the synthesis of N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates and other heterocycles

A new and simple synthesis of novel N-protected methyl 5-substituted-4-hydroxypyrrole-3-carboxylates, which exist in equilibrium with their 4-oxo tautomers, has been developed in two steps starting from N-protected α-amino acids. The key intermediates are enaminones, which can also be isolated, characterized, and used for the construction of other functionalized heterocycles, before they spontaneously decompose to pyrrole products. 4-Hydroxypyrroles are prone to partial aerial oxidation but can be efficiently alkylated or reduced to stable polysubstituted pyrrolidine derivatives.     

Specific intramolecular aromatic CH insertion of diazosulfonamides

The chemoselectivity in the intramolecular CH insertion of various diazosulfonamides has been experimentally studied. The results reveal that the aliphatic 1,4-, 1,5-, or 1,6-C(sp³)?H insertions of diazosulfonamides are not accessible, while the aromatic 1,5-C(sp²)?H insertion can be realized specifically by adjusting the diazo-adjacent group. In addition, the general chemoselectivities in the intramolecular CH insertions of diazosulfonyl compounds are summarized. Generally, diazosulfones undergo both aromatic 1,5-C(sp²)?H and aliphatic 1,5- and 1,6-C(sp³)?H insertions, while diazosulfonates undergo aliphatic 1,5- and 1,6-C(sp³)?H insertions. However, diazosulfonamides only undergo aromatic 1,5-C(sp²)?H insertion.     

N-Heterocyclic carbene-palladacyclic complexes: synthesis,characterization and their applications in the C-N coupling and α-arylation of ketones using aryl chlorides

N-Heterocyclic carbene-palladacyclic complexes 3 were successfully achieved in a one-pot procedure under mild conditions. The structure of 3a was unambiguously confirmed by X-ray single crystal diffraction and it was an active catalyst in the Buchwald-Hartwig amination and α-arylation of ketones even at very low catalyst loadings (0.01?mol%).     

Iodine-mediated oxidative Pictet-Spengler reaction using terminal alkyne as the 2-oxoaldehyde surrogate for the synthesis of 1-aroyl-β-carbolines and fused-nitrogen heterocycles

An efficient iodine-mediated oxidative Pictet-Spengler reaction in dimethyl sulphoxide (DMSO) using terminal alkynes as the 2-oxoaldehyde surrogate for the synthesis of aryl (9H-pyrido[3,4-b]indol-1-yl)methanones is described. The scope of the protocol includes the total synthesis of Fascaplysin, Eudistomins Y₁ and Y₂. The methodology is extended for preparing pyrrolo[1,2-a]-quinoxaline and indolo[1,5-a]quinoxaline derivatives. The utility of 1-aroyl-β-carbolines was demonstrated by performing palladium-catalyzed β-carboline directed ortho-C(sp2)-H functionalization of the phenyl ring with thiomethyl (SMe) group using DMSO as source and for accessing 4-aryl-canthin-6-ones.     

Facile synthesis of bicyclic 1-arylpyrazol-5-ones

In this Letter, we described a facile method for constructing fused bicyclic 1-arylpyrazol-5-one ring system. We employed various methylene-containing carboxylic acids as the substrates and proved that the pyrazolone ring closure requires activated methylene group in intermediate II. Accordingly, a series of structurally diversified, fused bicyclic 1-arylpyrazol-5-ones was prepared in moderate to high yields using the requisite substrates.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Cu0-catalysed 1,3-dipolar cycloadditions of α-amino acid derived N,N-cyclic azomethine imines to ynones

A series of 20 CuAIAC reactions between eight 4-acylamino substituted pyrazolidine-3-one-1-azomethine imines and four terminal ynones were performed using Cu⁰ as catalyst. The corresponding fluorescent cycloadducts were obtained in very high yields upon simple workup. Thus, Cu-metal turned out to be a better catalyst than Cu^I in terms of yield and ease of isolation. Availability of azomethine imines, mild reaction conditions, and simple workup enable a “click” access to libraries of densely substituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazol-1-ones. Reactivity of differently substituted dipoles was evaluated experimentally and by quantum chemical methods (DFT).     

Synthesis and antioxidative/anti-inflammatory activity of novel fullerene–polyamine conjugates

(E)-4-(Fullerenopyrrolidin-1-yl)-3-methylbut-2-enoic acid and its corresponding succinimidyl ester, readily obtained through Prato-type modification of C₆₀, were used for the selective N-acylation of polyamines. The thus obtained conjugates were evaluated for their antioxidative and anti-inflammatory activity and their cytotoxicity was determined. Members of this family of compounds showed interesting anti-lipid peroxidation, anti-lipoxygenase and anti-inflammatory activity and comparable cytocompatibility to spermidine.