1—N—（6—硝基苯并咪唑—1—乙酰基）—4—苯基氨基硫脲及其过渡金属配合物

以新配体１－Ｎ－（６－硝基苯并咪唑－１－乙酰基）－４－苯基氨基硫脲（ＮＢＰＭＳ）合成了Ｍｎ（Ⅱ）、Ｃｕ（Ⅱ）、Ｃｏ（Ⅱ）、Ｚｎ（Ⅱ）、Ｃｄ（Ⅱ）、Ｎｉ（Ⅱ）、Ｐｂ（Ⅱ）等金属离子的配合物，并进行了表征。这些化合物的红外光谱表明，配体以四齿方式通过烯醇式羰基氧原子，烯醇式硫羰基硫原子，以及Ｃ＝Ｎ↑１、Ｃ＝Ｎ↑２的红外光谱表明，配体以四齿方式通过烯醇式羰基氧原子，烯醇式硫羰基硫原子，以及Ｃ＝Ｎ↑１、Ｃ     

稀土—苯甲酰三氟丙酮—4,4‘—联吡啶—N,N’—二氧化物三元配合物的合成与表征

合成了稀土珉本甲酰三氟丙酮（ＢＴＡ〈以Ｌ代表）和４,４’－联吡啶－Ｎ,Ｎ‘－二氧的的三元配合物。通过元素分析,确定其组成分别为Ｌａｌ３Ｌ和ＬｎＬ３Ｌ０．５。通过元素分析,ＩＲ、ＵＶ,荧光光谱和电导测试,对它们的物理化学性质进行了研究。     

2—二甲胺基—6羟基—4—甲基嘧啶与铜（Ⅱ）,锌（Ⅱ）配合物的研究

本文合成了２－二甲胺基６－羟基－４－基嘧啶与铜（Ⅱ），锌（Ⅱ）的配合物，并用元素分析，红外，紫外光谱，差热－热重和摩尔电导等方法对产的性质进行了表征。     

4—氟—2,2''—联吡啶钴(Ⅱ)(Ⅲ)镍(Ⅱ)配合物的合成及几何异构

本文报道4-氟-2,2′-联吡啶(fbpy),[Co(fbpy)_3]3ClO_4(Ⅰ),[Co(fbpy)_3](Ⅱ)和[Ni(fbpy)_3]Cl_2(Ⅲ)的合成和后三者的几何异构体.从~(19)F NMR光谱证实;配合物(Ⅰ)在水溶液中是d~6抗磁体系,存在面式(fac)和径式(mer)两种刚性几何异构体,两者比例是1:3;配合物(Ⅱ)和(Ⅲ)分别是d~7和d~8顺磁体系,~(19)F NMR光谱是宽峰但仍可辨认出也都存在1:3的fac和mer.此外用~1H NMR测磁矩的方法验证了三个配合物的磁性。     

铁系元素冠醚配合物的研究——Ⅲ.三氯化铁与3′,4′—二硝基苯并—15—冠—5配合物的合成和性质

本文报道,三氯化铁(水合物)与3’,4’—二硝基苯并—15—冠—5固态配合物的合成。对合成的新配合物,作了元素定量分析。进而对该配合物的红外光谱、紫外光谱、热重、差热分析和X—射线粉末衍射分析等进行了研究。从而证明,该配合物为1:1型,非溶剂化和不含结晶水的固态配合物。 在同样条件下,3’,4’—二硝基苯并—15—冠—5与CoCl_2、NiCl_2(均为水合物)不形成配合物。     

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.     

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.     

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.     

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.     

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.