2—（6—硝基—2—苯并噻唑偶氮）—5—二甲氨基苯甲酸与铜显色反应的研…

本研究了２－（６－硝基－２－苯并噻唑偶氮）－５－二甲氨基苯甲酸（６－ＮＯ２－ＢＴＡＭＢ）与铜的显色反应。结果表明，在ｐＨ２．０￣４．５的乙醇水溶液中６－ＮＯ２－ＢＴＡＭＢ与铜形成一种稳定的蓝绿色络合物，其最大吸收波长位于６５０ｎｍ处，表观摩尔吸收系数为７．７５×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１，络合物的组成为６－ＮＯ２－ＢＴＡＭＢ∶Ｃｕ＝１∶１，铜浓度在０￣１０μｇ／１０ｍｌ范围内服从比尔定     

1—（5—溴—2—吡啶偶氮）—2—萘酚—6—磺酸与铁（Ⅱ）显色反应的研究及其应用

本研究了１－（５－溴－２－吡啶偶氮）－２－萘酚－６－磺酸（５－Ｂｒ－ＰＡＮ－Ｓ）与铁（Ⅱ）的显色反应，试验表明，在ｐＨ３－１０范围内铁（Ⅱ）与５－Ｂｒ－ＰＡＮ－Ｓ型成稳定的络合物，络合物在５５０ｎｍ和７５０ｎｍ有二个吸收峰，其表现摩尔吸光系数分别为２．３１×１０＾４和１．７７×１０＾４Ｌ．ｍｏｌ＾－＾１．ｃｍ＾－＾１。络合物组成比为铁（Ⅱ）：５－Ｂｒ－ＰＡＮ－Ｓ＝１：２，络合物稳定常数为１．８２     

3,3′,5,5′—四甲基联苯胺吸光光度法测定水中NO2^——N

提出用３,３′,５－５′－四甲基联苯胺（ＴＭＢ）吸光光度法测定水中ＮＯ２＾－－Ｎ。在ＨＯＡｃ－ＮａＯＡｃ缓冲液（ｐＨ３．６）中,ＴＭＢ与ＮＯ２＾－反应生成蓝色的ＴＭＢ－ＴＭＢ亚胺传荷络合物,其最大吸收波长为６５０ｎｍ,表观摩尔吸光系数为２．５９×１０＾４,ＮＯ２＾－－Ｎ与０～０．５μｇ·ｍｌ＾－１范围内服从比耳定律。运用此法测定了环境水样并进行了加标回收试验,结果满意。     

Meso—四—（3,5—二溴—4—羟基苯）卟啉分光光度测定食品中微量铅

研究了溴代卟啉试剂（ＤＢＨＰ）Ｐ分光光度法测定食品中微量铅。在０．０８ｍｏｌ／ＬＮａＯＨ介质中,铅与Ｔ（ＤＢＨＰ）Ｐ反应生成一橙黄色配合物,λｍａｘ＝４７９ｎｍ,ε＝２．２×１０＾５Ｌ·ｍｏｌ＾－１·ｃｍ＾－１。铅在０－１２μｇ／２５ｍＬ范围内符合比耳定律,用于食品中微量铅的测定,获得满意结果。     

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     

大量锆存在下铪镧钼杂多酸—耐尔蓝体系测定给

本文研究了耐尔蓝（ＮＢ）－给镧钼杂多酸（ＨｆＬａＭｏ－聚乙烯醇（ＰＶＡ）体系测定铪的超高灵敏光度法。在ＰＶＡ存在下，铪，镧和钼酸铵形成杂多酸，继而与耐尔蓝形成离子缔合物。其适宜条件为〔ＨＣｌｏ４〕＝１．２ｍｏｌ／Ｌ，〔Ｌａ×３＋〕＝２．９×１０＾－７ｍｏｌ／Ｌ，〔ＭｏＯ４×２－〕＝１．１×１０＾－３ｍｏｌ／Ｌ，〔ＮＢ〕＝２．７×１０＾－６ｍｏｌ／Ｌ，ＰＶＡ０．０８％。离子缔合物的最大吸收波长在５９     

钍（Ⅳ）与偶氮溴膦—mB和溴化十四烷基吡啶在乙醇—水溶液中的显色反应及其分

在ｐＨ１￣２的酸性介质中,钍（Ⅳ）与偶氮溴膦－ｍＢ（ＢＰＡｍＢ）形成最大吸收波长（λｍａｘ位于６８６ｎｍ的蓝色络合物,摩尔吸光系数（ε）为８．２７×１０＾４Ｌ·ｍｏｌ＾－１·ｃｍ＾－１。在有少量乙醇存在的０．５￣１．０ｍｏｌ／Ｌ盐酸溶液中,钍（Ⅳ）能与ＢＰＡｍＢ和溴化十四烷基吡啶形成更灵敏的三元络合物,最大吸收位于６９５ｎｍ,具有更大的对比度（Δλ＝１３５ｎｍ）和更高的灵敏度。ε值达１．４１×１０     

显色剂交换萃取光光度法测定微量铜

用三氯甲烷萃取Ｃｕ－ＤＤＴＣ络合物，然后在ｐＨ＝９．２三羟甲基氨基甲烷（Ｔｒｉｓ）缓冲液中用５－Ｂｒ－ＰＡＤＡＰ交换络合物中ＤＤＴＣ，形成了Ｃｕ－ＰＡＤＡＰ络合物。该络合物最大吸收波长λｍａｘ＝５２０ｎｍ，表观摩尔吸光系数ε５２０＝１．２２×１０＾５，铜量在０．２￣１０．０μｇ／１２ｍｌ范围内服从比耳定律。本法应用于食品、生物材料中微量铜测定，得到较为满意的结果。     

新试剂3,3‘—二甲基联苯重氮氨基—4—苯基—2—噻唑分光光度法测定？…

研究了新试剂３,３’－二甲基联苯重氮氮基－４－苯基－２－噻唑（ＤＭＰＤＰＡＰＴ）在表面活性剂Ｎ－氨代十六烷基吡啶存在下,与汞（Ⅱ）显色反应的适宜条件。在ＰＨ７．２－９．２范围内,汞（Ⅱ）与ＤＭＤＰＤＡＰＴ形成２：２紫红色配合物,其最大吸收波长为５６０ｎｍ,配合物的表观摩尔吸光系数ε＝９．０１＊１０＾４Ｌ．ｍｏｌ＾－１。ｃｍ＾－１。汞（Ⅱ）浓度在０－１２μｇ／２５ｍＬ范围内符合比尔定律。此法已用于水     

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％。     

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.