测定钴的化学发光新体系

研究了新吖啶衍生物９，１０－二甲基吖啶氟磺酸盐的化学发光特性。建立了测定Ｃｏ６２＋的化学发光新体系。方法线性范围为１．０×１０＾－１０－１．０×１０＾－７ｇ／ｍＬ；检测限为５．０×１０＾－１１ｇ／ｍＬＣｏ＾２＋。测定５．０×１０＾－９ｇ／ｍＬＣｏ６２＋的相对标准偏差为６．０％。方法选择性好，用于自来水，江水，池塘水中痕量钴的测定，结果令人满意。     

高锰酸钾-亚硫酸钠-核黄素化学发光体系的研究

研究了核黄素在酸性条件下与高锰酸钾和亚硫酸钠发生化学发光反应的行为,建立了流动注射化学发光测定核黄素的新方法。核黄素浓度在１．０×１０＾－７－１．０×１０＾－５ｇ／ｍＬ范围内与化学发光强度呈良好的线性关系,检出限为３×１０＾－８ｇ／ｍＬ。对４．。０×１０＾－７ｇ／ｍＬ的核黄素进行１１次平行测定,得方法的相对标准偏差为１．６％。     

偶合反应化学发光法测定痕量银的研究——K4Fe（CN）6—Luminol体系

将Ａｇ（Ｉ）催化Ｋ４Ｆｅ（ＣＮ）６的水合反应与Ｌｕｍｉｎｏｌ同Ｃｕ（ＣＮ）＾２－４的化学发光反应相偶合，建立起一种新的灵敏测定痕量银的化学发光分析法，在所研究的优化条件下，该法测定银的选择性较好，检测限达到４．０×１０＾－１３ｇ／ｍＬＡｇ线性浓度范围为１．０×１０＾－１２～１．０×１０＾－６ｇ／ｍＬＡｇ对４×１０＾－１１ｇ／ｍＬＡｇ（Ｉ）溶液连续１１次测定的ＲＳＤ≤３．５％，用于环境水和岩矿中银的     

空气中肼的流动注射化学发光分析

研究了肼在碱性条件下与鲁米诺和高磺酸钾产生化学发光行为，建立了流动注射化学发光测定痕量肼的新方法。肼的浓度在１．０×１０＾－８－１．０×１０＾－６ｇ／ｍＬ范围内与化学光强度成线性关系；检出限为４×１０＾－９ｇ／ｍＬ；相对标准偏差小于３％。     

流动注射化学发光法测定利血平

研究了利血平在酸性条件下与高锰酸钾和过氧化氢产生化学发光的行为，建立了流动注射化学发光测定利血平的新方法。利血平的浓度在１．０×１０＾－６￣８．０×１０＾－５ｈ／ｍＬ范围内与化学发光强度呈良好的线性关系；检出限为３×１０＾－７ｇ／ｍＬ。对６×１０＾－６ｇ／ｍＬ利血平进行１１次平行测定，得方法的相对标准偏差为１．３％。方法用于药剂中利血平含量测定，结果与药典标准方法测得值一致。     

流动注射化学发光法测定盐酸异丙嗪

在酸性溶液中，高锰酸钾能氧化盐酸异丙嗪产生化学发光反应，乙二醛的存在可使发光强度增强。据此，采用流动注射技术，建立了一种测定盐酸异丙嗪的化学发光分析分析。方法的检出限为３．５×１０＾－８ｇ／ｍＬ，相对标准偏差为２．８％（１．０×１０＾－６ｇ／ｍＬ盐酸异丙嗪，ｎ＝１１），线性范围为１．０×１０＾－７￣６．０×１０＾－５ｇ／ｍＬ。该法已用于盐酸异丙嗪针剂和片剂中盐酸异丙嗪含量的测定，并与药典标准方法进     

偶合反应化学发光法测定痕量银的研究

本将Ａｇ（Ⅰ）催化Ｓ２Ｏ＾２－８氧化Ｍｎ（Ⅱ）生成ＭｎＯ＾－４的催化反应与ＬｕｍｉｎｏｌＭｎＯ＾－４－ＯＨ＾－的化学发光反应相偶合，建立起一种新的灵敏测定痕量银的化学发光分析法，在所研究的优化条件下，该法测定银的选择性较好，检测限达到３．２×１０＾－１２ｇ／ｍＬＡｇ线性浓度范围为１．０×１０＾－１１－１．０×１０＾－５ｇ／ｍＬＡｇ，用于水样分析，结果较为满意。     

流动注射—吐温40化学发光新体系测定贵金属冶金物料中微量铱

本文研究了吐温４０－ＫＯＨ－Ｈ２Ｏ２－Ｉｒ化学发光新体系，采用流动注射进样技术，建立了测定铱的新的化学发光分析法，检测限为１．１×１０＾－１３ｇ／Ｌ；线性范围为每ｍＬ１．０×１０＾－９－１．０×１０＾－５ｇ。经离子交换分离Ａｕ和Ｏｓ离子后，测定贵金属冶金物料中微量铱，结果满意。     

流动注射示差动力学化学发光法测定微量硅

根据硅钼杂多酸氧化Ｌｕｍｉｎｏｌ产生化学发光的性质，以及硅钼杂多酸与磷钼杂多酸形成速度的差异，采用停流技术，在硅磷共存时，不经分离，实现了对和钢样中硅的选择性测定。该法检出限为２．０×１０＾－８ｇ／ｍＬ，线性范围１．０×１０＾－７－１．０×１０＾－５ｇ／ｍＬ，相对标准偏差为２．８％。     

高锰酸钾—连二亚硫酸钠—核黄素化学发光体系的研究

在酸性溶液中，高锰酸钾能氧化核素产生化学发光，连二亚硫酸钠的存在可使发光强度大大增强，采用流动注射技术，建立了测定核黄素的化学发光分析法，方法的检出限为６．２×１０＾－８ｇ／ｋｍＬ，线性范围为２×１０＾－７～１×１０＾－５ｇ／ｍＬ对４．０×１０＾－６ｇ／ｍＬ核黄素进行１１次平行测定，相对标准偏差为１．８％，方法用于针剂和片剂中核黄素测定，与药典标准方法－紫外分光光度法对照，相对误差不大于±２％。     

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.