1,4—二氟四苯基苯的合成,结构与构象

借助电子转移催化反应的方法，用电子给予体１，４－二锂四苯基丁二烯将惰性的三溴氟甲烷活化，并与之发生反应。产物１，４－二氟四苯基苯的结构经ＭＳ、ＮＭＲ和Ｘ射线单晶衍射确证，并以分子力学的方法对其进行了构象分析。     

电子受体与诺氟沙星的电荷转移反应

本文研究了电子受体对苯醌、２，３－二氰－５，６－二氯－１，４－对苯醌、四氯对苯醌和四溴对苯酯与诺氟沙星［１－乙基－６氟－１，４－二氢－１，４－二氢－４－氧人－７－（１－哌嗪基）喹啉－３－羧酸］电子给体之间的荷移反应。     

三氟乙酸酐催化的Friedel—Crafts酰化反应—4—乙基—2,5—…

本文报道了在三氟乙酰酐催化下的Ｆｒｉｅｄｅｌ－Ｃｒａｆｔｓ酰化反应，即用８种不同取代基的脂肪酸与２－乙基－１，４－二甲氧基苯的酰化反应合成了相应的４－乙基－２，５－二甲氧基苯基烷基酮，并用ＩＲ、ＵＶ、ＮＭＲ及ＭＳ进行了结构鉴定，同时讨论了该反应的规律。     

强力杀虫剂氟铃脲的分析和鉴定

报道了用质谱法和高效液相色谱法对氟铃脲的分析和鉴定。１－［３，５－二氯－４－（１，１，２，２－四氟乙氧基）苯基］－３－（２，６－二氟苯甲酰基）脲，即氟铃脲，是一种能够抑制昆虫表皮几丁质合成的强力杀虫剂。由ＥＩ源质谱仪获得氟铃脲的ＭＳ图和丰度数据，并提出它的碎裂途径和特征离子。在高效液相色谱分析方法中采用ＭｉｃｒｏｐａｋＣＮ－１０柱，甲醇－水作淋洗液，检测波长２５４ｎｍ，主峰与杂质峰完全分离，用该法可分析氟铃脲粗品和制剂。     

（3—苄基—4—芳酰基—1,2,4—三唑—5—基）（5—苯基—1,3,4—E…

通过３－苄基－４－芳酰基－１，２，４－三唑－５－巯基负离子在２－甲磺酰基－５－苯基－１，３，４－Ｅ二唑环２－位上的亲核取代反应，制得１３个新的（３－苄基－４－芳酰基－１，２，４－三唑－５－基）（５－苯基－１，３，４－Ｅ二唑－２－基）硫醚衍生物。经元素分析、ＩＲ、＾１Ｈ ＮＭＲ和ＭＳ裂解碎片分析确认结构。初步观察了它们在０．０１％浓度时对大肠杆菌繁殖的抑制作用。     

两种新型杯（4）芳烃衍生物用作毛细管气相色谱固定相的研究

合成了两种新型的杯（４）芳烃衍生物：５－１′，１′－二甲基十一烯氧基苯基甲基－１１，１７，２３－三－１，１－二甲基乙基－２５，２６，２７，２８－四苄氧基杯（４）芳烃Ｃ（４）ＴＢ）及５－１′，１′－二甲基十一烯氧基苯基甲基－１１，１７，２３－三－１′，１′－二甲基－２５，２６，２７，２８－四乙氧羰甲氧基（Ｃ（４）ＴＥＣＭ）其结构经元素分析ＩＲ，＾１ＨＮＭＲ，ＭＳ的数据证实，分别将其与ＯＶ－１７０１固     

6,7—取代—1H—苯并（de）异喹啉—1,3（2H）二酮的合成

从二氢苊出发合成了６－溴－７－氨基２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮，６－甲氧基－７－氨基－２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮和６，７－二氨基－２－（２′，４′－二甲基）苯基－１Ｈ－苯并（ｄｅ）异喹啉－１，３（２Ｈ）－二酮，测定了它们的荧光量子产率，讨论了分子内重原子溴和给电子基对化合物荧光性质的影响。     

1－对甲苯磺酰基－3－芳基－4－苯基－1，4，2－二氮磷杂环戊－5－酮的合成及除草活性

通过１－苯基－３－对甲苯磺酰基脲与亚磷酸三苯酯和取代苯甲醛在甲苯中进行的类Ｍａｎ－ｎｉｃｈ反应合成１－对甲苯磺酰基－２－苯氧基－２－氧代－３－芳基－４－苯基－１，４，２－二氮磷杂环戊－５－酮．化合物的结构经元素分析、ＮＭＲ、ＭＳ及部分化合物的红外光谱所证实，对合成过程中所涉及到的副反应进行了初步探讨，生物测定实验表明，某些产物具有良好的选择性除草活性。     

2,6—二甲基—3—苯基—4α—对甲苯基—7—苯甲酰基—4α,5,6,12—四氢—1H,7H—1,3

通过２－甲基－４－对甲苯基－１－苯甲酰基－２，３－二氢－１Ｈ－１，５－苯并二氮杂Ｚｈｏｕ与由不对称１－苯基－２－偶氮－１，３－丁二酮热解产生的α－羰基烯酮的「２＋４」环加成反应制备了标题化合物（Ｃ３４Ｈ３０Ｎ２Ｏ３，Ｍｒ＝５１４．６２），用Ｘ射线衍射测定了其单晶结构。     

1—甲苯磺酰基—3—芳基—4—苯基—1,4,2—二氮磷杂环戊—5—酮的合成及除草…

通过１－苯基－３－对甲苯磺酰基脲与亚磷酸三苯酯和取代苯甲苯在甲苯中进行的类Ｍａｎｎｉｃｈ反应合成１－对甲苯磺酰基－２－苯氧基－２－氧代－３－芳基－４－苯基－１，４，２－二氮磷杂环戊－５－酮。生物测定实验表明，某些产物具有良好的选择性除草活性。     

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.     

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.     

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.     

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.     

Highly regioselective Buchwald–Hartwig amination at C-2 of 2,4-dichloropyridine enabling a novel approach to 2,4-bisanilinopyridine (BAPyd) libraries

The highly regioselective Buchwald–Hartwig amination at C-2 of the cheap and readily accessible reagent, 2,4-dichloropyridine with a range of anilines and heterocyclic amines is described. This new methodology is robust and provides a facile access to 4-chloro-N-phenylpyridin-2-amines on 0.25 mol scale. These intermediates undergo a further Buchwald–Hartwig amination at higher temperature to enable rapid exploration of the chemical space at C-4 and to provide a library of 2,4-bisaminopyridines.     

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%).