SYNTHESIS OF PROPYLENE GLYCOL AND DIMETHYL CARBONATE USING POLYMER－SUPPORTED CATALYSTS

ＳＹＮＴＨＥＳＩＳＯＦＰＲＯＰＹＬＥＮＥＧＬＹＣＯＬＡＮＤＤＩＭＥＴＨＹＬＣＡＲＢＯＮＡＴＥＵＳＩＮＧＰＯＬＹＭＥＲ－ＳＵＰＰＯＲＴＥＤＣＡＴＡＬＹＳＴＳＨｏｎｇＺＨＵ；ＬｉＢａｎＣＨＥＮ（ＧｕａｎｇｚｈｏｕＩｎｓｔｉｔｕｔｅｏｆＣｈｅｍｉｓｔｒｙ，...     

XPS IN VESTIGATION OF γ-Al_2O_3 SUPPORTED Pt-CONTAINING DUAL-COMPONENT CATALYSTS

ＸＰＳＩＮＶＥＳＴＩＧＡＴＩＯＮＯＦγ┐Ａｌ２Ｏ３ＳＵＰＰＯＲＴＥＤＰｔ┐ＣＯＮＴＡＩＮＩＮＧＤＵＡＬ┐ＣＯＭＰＯＮＥＮＴＣＡＴＡＬＹＳＴＳ＊ＪｉａＪｉｆｅｉ１，ＫｏｕＹｕａｎ２，ＸｕＺｈｕｓｈｅｎｇ１，ＺｈａｎｇＴａｏ１，ＺｈａｎｇＢｉｎｇ２，Ｌｉ...     

PREPARATION AND PROPERTIES OF COATED SEMICONDUCTOR CdS/ZnS NANOPARTICLES

ＰＲＥＰＡＲＡＴＩＯＮＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＣＯＡＴＥＤＳＥＭＩＣＯＮＤＵＣＴＯＲＣｄＳ／ＺｎＳＮＡＮＯＰＡＲＴＩＣＬＥＳ￥ＬｉＭｉｎＱＩ；ＪｉＭｉｎｇＭＡ；ＨｕＭｉｎＣＨＥＮＧａｎｄＺｈｅｎＧｕｏＺＨＡＯ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉ...     

THE TRANSPORT PROPERTY OF HYDROGEN THROUGH PALLADIUM IMPREGNATED γ－Al_2O_3 MEMBRANE

ＴＨＥＴＲＡＮＳＰＯＲＴＰＲＯＰＥＲＴＹＯＦＨＹＤＲＯＧＥＮＴＨＲＯＵＧＨＰＡＬＬＡＤＩＵＭＩＭＰＲＥＧＮＡＴＥＤγ┐Ａｌ２Ｏ３ＭＥＭＢＲＡＮＥＺｈａｏＨｏｎｇｂｉｎ，ＬｉＡｎｗｕ，ＧｕＪｉｎｇｈｕａ，ＸｉｏｎｇＧｕｏｘｉｎｇ＊（ＳｔａｔｅＫｅｙＬａ...     

ISS AND AES STUDIES OF CHANGES INDUCED ON Ni_3Ti(0001) BY OXYGEN EXPOSURE

ＩＳＳＡＮＤＡＥＳＳＴＵＤＩＥＳＯＦＣＨＡＮＧＥＳＩＮＤＵＣＥＤＯＮＮｉ_３Ｔｉ（０００１）ＢＹＯＸＹＧＥＮＥＸＰＯＳＵＲＥ￥ＬｉＪｕｎＹＡＯ；ＧｕｏＸｉｎｇＸＩＯＮＧ；ＤｅＺｈｅｎｇＷＡＮＧ；ＳｈｉＳｈａｎＳＨＥＮＧ；ＨｅｎｇＲｏｎｇＣＨＥＮａｎｄ?..     

纳米刚性微粒与橡胶弹性微粒同时增强增韧聚丙烯的研究

通过力学性能测试、动态力学试验、ＤＳＣ 分析以及材料断面形貌与结构分析等手段,对以纳米二氧化硅（ＳｉＯ２） 为刚性微粒、以三元乙丙橡胶（ＥＰＤＭ） 为弹性微粒组成的聚丙烯（ＰＰ）／ 纳米ＳｉＯ２／ＥＰＤＭ 的同时增强增韧效果进行了研究．结果显示,上述两种微粒可同时大幅度提高ＰＰ 的韧性、强度和模量,当ＰＰ／ 纳米ＳｉＯ２／ＥＰＤＭ 为８０／３／２０ 时,两种微粒体现较明显的协同增韧效应．纳米ＳｉＯ２ 可提高ＰＰ 的结晶温度和结晶速度,并使球晶细化．纳米ＳｉＯ２ 刚性微粒在ＰＰ连续相中以微粒团聚体形态分布,构成团聚体的平均微粒数约为６ ～７ ,其与ＰＰ基体表现出较强的结合牢度．ＰＰ／ 纳米ＳｉＯ２／ＥＰＤＭ 的综合性能已接近或达到工程塑料的性能．     

INORGANIC MEMBRANE－BASED ROUTE TO THE SYNTHESIS OF NANO－PARTICLE PALLADIUM

ＩＮＯＲＧＡＮＩＣＭＥＭＢＲＡＮＥ┐ＢＡＳＥＤＲＯＵＴＥＴＯＴＨＥＳＹＮＴＨＥＳＩＳＯＦＮＡＮＯ┐ＰＡＲＴＩＣＬＥＰＡＬＬＡＤＩＵＭＺｈａｏＨｏｎｇｂｉｎ，ＬｉＡｎｗｕ，ＧｕＪｉｎｇｈｕａ，ＸｉｏｎｇＧｕｏｘｉｎｇ＊（ＳｔａｔｅＫｅｙＬａｂｏｒａｔｏ...     

THE SUPPORTED GOLD CATALYSTS FOR CLOSED CYCLE CO_2 LASER

ＴＨＥ　ＳＵＰＰＯＲＴＥＤ　ＧＯＬＤ　ＣＡＴＡＬＹＳＴＳ　ＦＯＲ　ＣＬＯＳＥＤ　ＣＹＣＬＥ　ＣＯ_２　ＬＡＳＥＲＴＨＥＳＵＰＰＯＲＴＥＤＧＯＬＤＣＡＴＡＬＹＳＴＳＦＯＲＣＬＯＳＥＤＣＹＣＬＥＣＯ_２ＬＡＳＥＲ￥ＺｈｅｎｇＰｉｎｇＨＡＯ；ＬｉＤｕｎＡＮ；...     

SYNTHESES AND PROPERTIES OF TWO BENZIMIDAZOLYLCONTAINING DICOPPER（I） COMPLEXES

ＳＹＮＴＨＥＳＥＳＡＮＤＰＲＯＰＥＲＴＩＥＳＯＦＴＷＯＢＥＮＺＩＭＩＤＡＺＯＬＹＬＣＯＮＴＡＩＮＩＮＧＤＩＣＯＰＰＥＲ（Ｉ）ＣＯＭＰＬＥＸＥＳＸｉａｏＹａｎＬＩ；ＨｏｎｇＪｉａｎＳＵＮ（ＤｅｐａｒｔｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ，ＳｈａｎｄｏｎｇＵｎ...     

STUDY ON A NEW COMB POLYMER ELECTROLYTE(Ⅲ)

ＳＴＵＤＹＯＮＡＮＥＷＣＯＭＢＰＯＬＹＭＥＲＥＬＥＣＴＲＯＬＹＴＥ（Ⅲ）￥ＬｉＭｉｎｇＤＩＮＧ；ＹｕｎＱｉｎｇＬＩＮ；ＸｉａｏＧｕａｎｇＳＵＮ（ＣｈａｎｇｃｈｕｎＩｎｓｔｉｔｕｔｅｏｆＡｐｐｌｉｅｄＣｈｅｍｉｓｔｒｙ，Ｃｈａｎｇｃｈｕｎ１３００２２）...     

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.     

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.     

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.