5-Br-PADAP-NO2--SCN-三元离子缔合物分光光度法测定微量NO2-的研究

研究了在硫酸介质中５－Ｂｒ－ＰＡＤＡＰ与ＮＯ＾－２和ＳＣＮ＾－形成三元离子缔合物的最佳条件,其表观摩尔吸光系数ε５５０＝２．４＊１０＾４Ｌ／（ｍｏｌ．ｃｍ）,缔合物组成比为ｎ（５－Ｂｒ－ＰＡＤＡＰ）：ｎ（ＮＯ＾２）：ｎ（ＳＣＮ＾＿＝１：１：１。     

Mo（Ⅵ）－PAN与Mo（Ⅵ）－PAR体系的极谱性质对比研究

本文比较了Ｍｏ（Ⅵ）－１－（２－吡啶基偶氮）－２－萘酚（ＰＡＮ）与Ｍｏ（Ⅵ）－４（２－吡啶基偶氮）间苯二酚（ＰＡＲ）的极谱性质，讨论它们在作为吸附波试剂时的优缺点，以求得在选择络合剂时的感性和理性认识．本文还报道了Ｍｏ（Ⅵ）－ＰＡＮ－ＫＢｒＯ３吸附催化波体系，最佳实验条件，０．１ｍｏｌ／ＬＨＡｃ－－ＮａＡｃ，ｐＨ＝４．６，０．０１ｍｏｌ／ＬＫＢｒＯ３，２．５×１０－５ｍｏｌ／ＬＰＡＮ．峰电位为－０．７１Ｖ（ｖｓ．ＳＣＥ），检出限１×１０－９ｍｏｌ／Ｌ，线性范围０～６×１０－７ｍｏｌ／Ｌ     

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。     

金属离子与卟啉的嵌入反应动力学研究──Ⅶ．一元酸根催化Cu(Ⅱ)与溴化间－四(N－乙酸甲酯基－3－吡啶基)卟啉的配位反应

研究了在３５±０．１℃、离子强度０．５ｍｏｌ／Ｌ（ＫＣｌ）条件下，甲酸根、乙酸根、丙酸根和丁酸根分别催化Ｃｕ（Ⅱ）离子与四溴化间－四（Ｎ－乙酸甲酯基－３－吡啶基）卟啉（Ｈ２Ｔβ－Ｎ－ＡＣＭｓｐｙＰＢｒ４）的反应动力学及其机理，该类反应对卟啉和Ｃｕ（Ⅱ）离子均为一级反应，反应动力学方程为：ｄ［ＣｕＰ＾４＋］／ｄｔ＝ｋ｛１．０＋ｂ［Ａ＾－］）／（１．０＋Ｋ３，４．［Ｈ＾＋］＾２｝［Ｃｕ＾２＋］［Ｐ］Ｔ     

SYNTHESTS OF 5-SUBSTITUTED PHENYLAMINO 6-PHENY-1. 2. 4-TRIAINE-3-ONES

ＳＹＮＴＨＥＳＴＳ　ＯＦ　５－ＳＵＢＳＴＩＴＵＴＥＤ　ＰＨＥＮＹＬＡＭＩＮＯ　６－ＰＨＥＮＹ－１．２．４－ＴＲＩＡＩＮＥ－３－ＯＮＥＳ￥ＺｈｏｎｇＥＬＵ；ＷｅｎＱｉｎＺＨＥＮＧ；ＲｕｎＳｈｅｎｇＺＥＮＧ；ＪｉａｎＰｉｎＺＨＯＵ；ＫｅＱｉａｎＣＨＥＮ（...     

SYNTHESIS OF 4－S－（1＂－ARYL－TETRAZOLE－5＂－YL）－4－DEOXY－4＇－DEMETHYL－EPIPODOPHYLLOTOXIN ANALOGUES

ＳＹＮＴＨＥＳＩＳ ＯＦ ４－Ｓ－（１＂－ＡＲＹＬ－ＴＥＴＲＡＺＯＬＥ－５＂－ＹＬ）－４－ＤＥＯＸＹ－４＇－ＤＥＭＥＴＨＹＬ－ＥＰＩＰＯＤＯＰＨＹＬＬＯＴＯＸＩＮ ＡＮＡＬＯＧＵＥＳ￥ＫｕａｎＫｅＬＵ；ＦａｎｇＭｉｎＬＩＵａｎｄＹａｏＺｕＣＨＥＮ（Ｄ...     

1,9-双(1'-苯基-3'-甲基-5'-氧代吡唑-4'-基)壬二酮-[1,9]与三辛基氧膦对镧(Ⅲ)、镝(Ⅲ)的协同萃取

研究了１，９－双（１－苯基－３－甲基－５－氧代吡唑－４－基）壬二酮－［１，９］（ＢＰＭＰＮＤ，Ｈ２Ａ）与三辛基氧膦（ＴＯＰＯ，Ｂ）的氯仿溶液，从硝酸介质中对Ｌａ（Ⅲ）、Ｄｙ（Ⅲ）的协同萃取，计算了体系的酸性协萃系数ＲＡ和协萃系数Ｒ，用斜率法测得协萃合物的组成为ＬａＡ·ＨＡ·Ｂ和ＤｙＡ·ＨＡ·Ｂ，计算了协萃平衡常数，研究了温度对协萃反应的影响，用萃取法制得了固态协萃合物，并对其组成、ＩＲ及ＴＧ－ＤＴＡ进行了研究．     

流动注射—氢化物发生—非色散原子荧光光谱法直接测定海水中的砷（Ⅲ）和砷（

用流动注射－氢化物发生－非色散原子荧光光谱法对海水中Ａｓ（Ⅲ）和Ａｓ（Ⅴ）的直接测定进行了研究,氢化物发生的最佳条件为：ＫＨＢ４溶液浓度为５ｇ．Ｌ＾－１（含ＫＯＨ５ｇ．Ｌ＾－１）,流速１０．０ｍＬ．ｍｉｎ＾－１;样品酸度为１．３ｍｏｌ．Ｌ＾－１ＨＣｌ,流速４．２ｍＬ．ｍｉｎ＾－１。对基体ＮａＣｌ,ＭｇＣｌ２,ＣａＣｌ２,Ｎａ２ＳＯ４以及微量共存金属离子（Ｃｄ,Ｚｎ,Ｐｄ,Ｃｕ）的干扰实验结果表明,基体和微量共存金属离子对Ａｓ（Ⅲ）的测定没有干扰。样品中Ａｓ（Ⅴ）的测定用硫脲进行预还原,通过总量和Ａｓ（Ⅲ）的含量的差减得到Ａｓ（Ⅴ）含量,在优化实验条件下下测量方法的检出限（３σ）为０．０８ｎｇ．ｍＬ＾－１;７次测定的相对标准偏差为０．４８％－１．３０％（８．０ｎｇ．ｍＬ＾－１标准溶液）。标准曲线和标准加入法对海水     

2—取代—1,7—二氧螺（4.4）壬—8—酮的合成研究

分别用Ｋ２ＣＯ３，１，５－二氮双环（４．３．０）壬－５－烯（ＤＢＮ）和四丁基氟化铵（ＴＢＡＦ）等碱催化３－（３－羟基丙基）－γ－丁烯酸内酯的分子内Ｍｉｃｈｅａｌ加成反应合成了２－取代－１，７－二氧螺（４．４）壬－８－酮     

5-[2-(4-氯苯酚)偶氮]-若丹宁与铂(Ⅱ)的显色反应研究及应用

研究了新显色剂５－［２－（４－氯苯酚）偶氮］－若丹宁与铂（Ⅱ）的显色反应．在Ｈ２ＳＯ４－Ｈ３ＰＯ４介质中和ＣＴＭＡＢ存在下，试剂与Ｐｔ（Ⅱ）形成有色配合物，λｍａｘ位于４２６ｎｍ，摩尔吸光系数为３．２４×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，Ｐｔ（Ⅱ）量在４．００～１０μｇ／２５ｍＬ符合比耳定律，方法用于铂催化剂中铂的测定，获得较好的结果．     

新型1,1-二氧代-4H-苯并[1,2,4]-噻二嗪类衍生物的合成及其抗肿瘤活性

以2-硝基苯磺酰氯为起始原料,经多步反应合成了12种新型1,1-二氧代-4H-苯并[1,2,4]-噻二嗪类衍生物,产物收率高,水溶性好,并经¹H NMR、¹³C NMR、MS-ESI和元素分析法确证结构。 用MTT法测试了这类衍生物对肝癌细胞HepG-2生长的抑制作用,结果显示目标化合物能不同程度地抑制肿瘤细胞生长,其中7-氨甲基-3-环丙基-1,1-二氧代-4H-苯并[1,2,4]-噻二嗪 (7c)对肝癌细胞HepG-2的抗性显著,最高抑制率达到79.3%。     

对硝基甲苯合成3,4-二甲基苯胺的研究

以对硝基甲苯为原料,经胺甲基化、水解、还原3步反应合成了目标化合物。通过单因素实验,分析每一步反应的关键影响因素,初步得到适宜的合成条件。最终产物的结构经核磁氢谱、质谱、元素分析进行确证,纯度经气相色谱分析。3,4-二甲基苯胺的总收率56.6%,纯度大于98.5%。该合成路线原料易得,成本较低,操作简单。     

Improved synthesis of the thiophenol precursor N-(4-chloro-3-mercaptophenyl)picolinamide for making the mGluR4 PET ligands

Recently [¹¹C]mG4P012 (previously [¹¹C]KALB012 and presently named as [¹¹C]PXT012253 by Prexton Therapeutics) had been used as a biomarker during the preclinical development of a potential therapeutic drug, PXT0002331 (an mGluR4 PAM), for PD and l-dopa-induced dyskinesia. [¹¹C]mG4P012 was shown to be a promising PET radioligand for mGluR4 in the monkey brain and for further development in human subjects. However, the previously reported multi-step synthesis of the thiophenol precursor suffered from low yields and difficult workup procedures. To support the translational research of [¹¹C]mG4P012 and the other potential applications, we have developed a new route for synthesis of the thiophenol precursor and optimized the reaction conditions. The synthesis of N-(4-chloro-3-mercaptophenyl)picolinamide from 1-chloro-4-nitrobenzene has been greatly improved from 8% to 52% total yield with easy handling and in gram scales.     

含吡唑1,2,4-三唑噻二嗪衍生物的合成及抑菌活性

1-苯基-3-甲基-5-氯-4-吡唑甲醛与4-氨基-5-取代苯基-1,2,4-三唑-3-硫酮缩合生成4-(1-苯基-3-甲基-5-氯吡唑次甲亚胺基)-5-(取代苯基)-2H-1,2,4-三唑-3(4H)-硫酮,再烷基加成化为新型含吡唑基5,6-2H-1,2,4-三唑[3,4-b][1,3,4]噻二嗪衍生物。 化合物结构经¹H NMR、IR以及元素分析确认。 初步生物活性测试结果表明,在100 mg/L浓度下,化合物8a(3-(2-甲基苯基)-6-(5-氯-2-甲基-4-苯基吡唑)-7-(4-硝基苯基)-5H-1,2,4-三唑[3,4-b][1,3,4]噻二嗪)对黄瓜炭疽病的抑制率达90%。     

A convenient method for N-1 arylation of uracil derivatives

1-(4-Nitrophenyl)- and 1-(2,4-dinitrophenyl)uracil derivatives have been obtained by direct arylation of uracil and its 5-substituted derivatives using 1-fluoro-4-nitrobenzene or 1-fluoro-2,4-dinitrobenzene in the presence of a base. The application of the newly obtained uracil derivatives in further synthesis is also presented.     

Synthesis, spectroscopy, thermal analysis, magnetic properties and biological activity studies of Co(II) and Co(II) complexes with Schiff base dye ligands

Three azo group-containing Schiff base ligands, namely 1-{3-[(3-hydroxypropylimino) methyl]-4-hydroxyphenylazo}-4-nitrobenzene (2a), 1-{3-[(3-hydroxypropylimino) methyl]-4-hydroxyphenylazo}-2-chloro-4-nitrobenzene (2b) and 1-{3-[(3-hydroxypropylimino) methyl]-4-hydroxyphenylazo}-4-chloro-3-nitrobenzene (2c) were prepared. The ligands were characterized by elemental analysis, FTIR spectroscopy, UV-Vis spectroscopy, 13C- and 1H-NMR spectroscopy and thermogravimetric analysis. Next the corresponding copper(II) and cobalt(II) metal complexes were synthesized and characterized by the physicochemical and spectroscopic methods of elemental analysis, FTIR spectroscopy, UV-Vis spectroscopy, magnetic moment measurements, and thermogravimetric analysis (TGA) and (DSC). The room temperature effective magnetic moments of complexes are 1.45, 1.56, 1.62, 2.16, 2.26 and 2.80 B.M. for complexes 3a, 3b, 3c, 4a 4b, and 4c, respectively, indicating that the complexes are paramagnetic with considerable electronic communication between the two metal centers.     

抗球虫药妥曲珠利的合成工艺改进

对妥曲珠利的合成工艺进行了改进。从4-三氟甲硫基苯酚和2-甲基-4-硝基氯苯出发,经5步反应合成了妥曲珠利。在光化反应中用固体光气代替光气,减少了环境污染,提高了总收率(71%)。     

HPLC Determination of the Antiseptic Agent Chlorhexidine and its Degradation Products 4-Chloroaniline and 1-Chloro-4-Nitrobenzene in Serum and Urine

Chlorhexidine (1,1-hexamethylene-bis-[5-(p-chlorophenyl)-biguanide]-digluconate; CHD) is one of the most frequently used antiseptics. In spite of this, its resorption and elimination has hardly been investigated. One of the main reasons for this is the lack of suitable procedures for its analysis in biological materials. Samples of CHD also may contain the carcinogen 4-chloroaniline which also may be formed as a degradation product in preparations.A HPLC method with end-capped stationary phase was developed which separates CHD, 4-chloroaniline and 1-chloro-4-nitrobenzene (a degradation product of 4-chloroaniline). Methods of solid-phase extraction and deproteinization for the purpose of isolating the analytes in serum and urine were also tested. In the latter process, isolation of all three compounds from the biological material using a single procedure was unsuccessful. Isolation of CHD, on the other hand, both from serum and from urine using solid-phase extraction with weak cation exchangers was successful and showed reliable retrieval rates.     

Microwave mediated reduction of heterocycle and fluorine containing nitroaromatics with Mo(CO)6 and DBU

Heterocycle containing nitroaromatics were reduced by Mo(CO)₆ and DBU in EtOH under microwave irradiation within 15 min. Under the same conditions, 4-fluoronitrobenzene was reduced to 4-fluoroaniline, whereas 2-chloro-1-fluoro-4-nitrobenzene afforded a mixture of 3-chloro-4-fluoroaniline and 3-chloro-4-ethoxyaniline. The extent of the competing S_NAr/reduction process could be influenced by the nature of the solvent, with t-BuOH the inert solvent of choice. The latter was used as solvent for S_NAr/reductions of 2-chloro-1-fluoro-4-nitrobenzene with S-nucleophiles to yield 3-chloro-4-mercaptoanilines.     

S<Subscript>N</Subscript>Ar Reaction of 1,5-Dichloro-2,4-dinitrobenzene with S-, O-, and N-Nucleophiles

A simple and convenient procedure has been proposed for the synthesis of 1,3,4-tris(4-R-phenylsulfanyl)- 6-nitrobenzene and 1,3,4,6-tetrakis(4-R-phenylsulfanyl)benzene by reaction of 1,5-dichloro-2,4-dinitrobenzene with various benzenethiols.