签字笔中油墨成分的检验方法研究进展

介绍了常见签字笔的分类,并综述了近十年中签字笔油墨成分检测方法的研究进展,包括光谱法(拉曼光谱法、红外光谱法、显微分光光度法、紫外-可见导数光谱法),色谱法(薄层色谱法、气相色谱-质谱法、高效液相色谱法、高效毛细管电泳法、裂解气相色谱法)和综合分析法等(引用文献19篇)。     

现代分析技术在罂粟碱检测中的应用

综述了近年来光谱(包括分光光度法、荧光分析法、化学发光法、红外光谱法、拉曼光谱法)、色谱(包括薄层色谱法、气相色谱法、液相色谱法)、质谱(包括气相色谱-质谱法、液相色谱-质谱法)、电化学、免疫等现代分析技术在罂粟碱检测中的应用,并对其发展趋势进行了展望(引用文献93篇)。     

生物样本中丙二醛测定方法的研究进展

综述了生物样本(主要包括生物体液、尿液、动物组织)中丙二醛的测定方法,主要包括紫外-可见分光光度法、荧光光谱法、高效液相色谱法、气相色谱-质谱法、酶联免疫吸附法和拉曼光谱法等,并对生物样本中丙二醛的测定方法进行了展望(引用文献36篇)。     

甲醛测定方法的研究进展

综述了甲醛测定方法(包括光谱法、电化学法、色谱法、生物学方法、化学方法和其他方法)的研究进展,并对其发展前景进行了展望(引用文献55篇)。     

水生生物中砷的提取和形态分析的研究进展

综述了水生生物中不同形态砷(包括无机砷、甲基砷、砷甜菜碱、砷胆碱、砷糖、砷脂)的提取方法、分离方法(包括气相色谱法、高效液相色谱法、毛细管电泳法等)和检测方法(包括原子吸收光谱法、原子发射光谱法、原子荧光光谱法、电感耦合等离子体质谱法等)的研究进展,并对其前景进行了简要展望(引用文献74篇)。     

非离子表面活性剂测定方法的研究进展

综述了非离子表面活性剂测定方法(包括色谱法、质谱法、液相色谱-质谱法、气相色谱-质谱法、电化学法、红外光谱法、化学发光法和分光光度法等)的研究进展(引用文献82篇)。     

草甘膦分析方法的研究进展

介绍了1990—2010年间草甘膦的定性、定量分析方法,包括红外光谱法、核磁共振法、分光光度法、色谱法、化学发光法等(引用文献50篇)。     

水中氯化物检测及样品前处理技术研究进展

综述了近年来我国水中氯化物检测及样品前处理技术的研究进展。样品前处理技术包括试剂法和离子交换树脂法;检测方法包括常规化学分析法(容量法和分光光度法)、电分析方法(电位滴定法和电化学法)、离子色谱法、光谱法(原子吸收光谱法和共振光散射光谱法)、连续流动注射法等(引用文献37篇)。     

工作场所空气中挥发性有机物的分析方法研究进展

综述了2002-2016年工作场所空气中挥发性有机物(VOCs)的分析方法,包括色谱法、光谱法、电化学法和直读法等,并对工作场所空气中挥发性有机物的检测分析方法的发展前景作了展望(引用文献94篇)。     

中药中痕量铅测定方法的研究进展

综述了近年(2000-2016年)来国内外中药中痕量铅的测定方法的研究进展,包括原子吸收光谱法、紫外-可见分光光度法、原子发射光谱法、原子荧光光谱法、电化学分析法、高效液相色谱法、质谱法和生物传感器法等(引用文献112篇)。     

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.     

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.     

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.     

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.     

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.     

Microwave-assisted copper-catalyzed stereoselective ring expansion of three-membered heterocycles with α-diazo-β-dicarbonyl compounds

Microwave-assisted copper-catalyzed ring expansions of three-membered heterocycles with α-diazo-β-dicarbonyl compounds were investigated. Thiiranes generated 3-acyl-5,6-dihydro-1,4-oxathiines in the presence of copper sulfate and trans-3-acyl-5,6-dihydro-1,4-oxathiines as stereospecific products for 1,2-disubstituted cis-thiiranes through an intramolecular S_N2 process. Oxiranes gave rise to 2-acyl-5,6-dihydro-1,4-dioxines under the catalysis of copper hexafluoroacetylacetonate and cis-3-acyl-5,6-dihydro-1,4-dioxines as stereospecific products for 1,2-disubstituted cis-oxiranes via an intimate ion-pair mechanism. The current method provides a direct and simple strategy in efficient preparation of 3-acyl-5,6-dihydro-1,4-oxathiines and 2-acyl-5,6-dihydro-1,4-dioxines, important agents in medicinal and agricultural chemistry, from readily available thiiranes and oxiranes, respectively.     

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.     

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.