负载Pt,Pd催化剂上NO—TPD和NO催化还原性能

负载Ｐｔ、Ｐｄ催化剂上ＮＯ－ＴＰＤ和ＮＯ催化还原性能１）钟依均（浙江师范大学化学系金华３２１００４）罗孟飞周碧袁贤鑫（杭州大学催化研究所杭州３１００２８）关键词负载Ｐｔ、Ｐｄ催化剂ＮＯ－ＴＰＤＣＯ－ＮＯ反应分类号Ｏ６４３．３２氮氧化物（ＮＯｘ）污染是...     

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．     

亚胺膦钌配合物RuCl2P2N2的合成和催化性能

ＲｕＣｌ２（Ｐｈ３Ｐ）４或ＲｕＣｌ２（ＤＭＳＯ）４在甲苯中直接与等摩尔的亚胺膦配体Ｎ，Ｎ－双－［邻－（二苯基膦苯亚甲基）］乙二胺（Ｐ２Ｎ２）在甲苯中回流反应，高产率地合成了反式配位的双亚胺双膦钌配合物ｔｒａｎｓ－ＲｕＣｌ２Ｐ２Ｎ２．在温和条件下，该配合物作为新型催化剂有效地催化α，β－不饱和酸和几种功能团烯烃的选择加氢反应．讨论了可能的催化活性物种．     

两亲性聚酯配体及其钆（Ⅲ）配合物的合成和弛豫性能研究

通过二乙三胺五乙酸二酐（ＤＴＰＡＡ）分别与Ｌ－Ｎ，Ｎ－双（２－羟乙基）取代的丙氨酸、苯丙氨酸、缬氨酸、亮氨酸、异亮氨酸和Ｎ，Ｎ－双（２－羟乙基）甘氨酸共聚，制备了六个大分子聚酯配体及其轧（Ⅲ）配合物。对所合成的配体和钆配合物进行了表征，并测试了部分钆配合物的弛豫性能。     

3-吡唑基-6-取代均三唑并[3,4-b]-1,3,4-噻二唑的合成及生物活性

以１－甲基－３－乙基（－４－氯）－５－吡唑甲酰肼作原料，经两步得到４－氨基－３－（１－甲基－３－乙基（－４－氯）－５－吡唑基）－１，２，４－三唑－５－硫酮（３），３再与取代羧酸反应，得到一系列３－（１－甲基－３－乙基（－４－氯）－５－吡唑基）－６－取代均三唑并［３，４－ｂ］－１，３，４－噻二唑（４、５、６）．元素分析、１ＨＮＭＲ、ＩＲ和ＭＳ确定了它们的结构．初步生测结果表明：３具有植物生长调节活性，４ｂ、４ｄ、６具有杀菌活性．     

新的多氨基多羧酸荧光螯合剂DTPA.2pAs的合成及其铽螯合物荧…

报道二乙三胺－Ｎ’（双对乙酰氨基水杨酸－Ｎ’，Ｎ″－三乙酸的合成，表征及其敏化铽离子发光的性能。利用光滴定方法确定了水溶液中螯合物的组成。研究了浓度，ＰＨ对荧光强度的影响，测量了螯合激发态的寿命，研究了ＤＴＰＡ．２ｐＡｓ从Ｔｂ－ＥＤＴＡ中取代ＥＤＴＡ引起的荧光变化。结果表明ＤＴＰＡ．２ｐＡｓ可望在荧光免疫分析中用作荧光增强溶液。     

中位－四（邻－硝基苯基）四苯并卟啉及其d过渡金属配合物的电化学性质

用微电极技术和循环伏安法研究了中位－四（邻硝基苯基）四苯并卟啉［ＴＰ（ｏ－ＮＯ＿２）ＴＢＰ］及其Ｆｅ（Ⅲ）、Ｃｏ（Ⅱ）、Ｎｉ（Ⅱ）和ｚｎ（Ⅱ）配合物在ＤＭＦ介质中的电化学行为。测得其电子转移过程的半波电位、标准速率常数及在ＤＭＦ中的扩散系数。并研究了吡啶轴向配位对Ｃｏ（Ⅱ）ＴＰ（ｏ－ＮＯ＿２）ＴＢＰ的氧化还原电位和速率的影响。提出了标题配位化合物在ＤＭＦ一吡啶混合溶剂中的电子转移机理。     

异阿玛瑞卡诺A甲醚、异阿玛瑞卡宁A甲醚和(±)┐3┐甲氧基┐4,9,9┐三羟基苯并二氧六环木脂素的合成

异阿玛瑞卡诺Ａ（７）［ＩｓｏａｍｅｒｉｃａｎｏｌＡ（７）］，异阿玛瑞卡宁Ａ（８）［ＩｓｏａｍｅｒｉｃａｎｉｎＡ（８）］及（±）－３－甲氧基－４，９，９－三羟基苯并二氧六环木脂素（９）［（±）－３－ｍｅｔｈｏｘｙ－３，７－ｅ－ｐｏｘｙ－８，...     

新的多氨基多羧酸荧光螯合剂DTPA·2pAs的合成及其铽螯合物荧光性能研究

报道二乙三胺Ｎ′，Ｎ（双）对乙酰氨基水杨酸Ｎ′，Ｎ″，Ｎ三乙酸（ＤＴＰＡ·２ｐＡＳ）的合成、表征及其敏化铽离子发光的性能。利用荧光滴定方法确定了水溶液中螯合物的组成，研究了浓度、ｐＨ对荧光强度的影响，测量了螯合物激发态的寿命，研究了ＤＴＰＡ·２ｐＡＳ从ＴｂＥＤＴＡ中取代ＥＤＴＡ引起的荧光变化。结果表明ＤＴＰＡ·２ｐＡＳ可望在荧光免疫分析中用作荧光增强溶液。     

Gd－DTPA氨基酸、短肽衍生物的合成及其磁共振成像造影性能的研究

合成了一系列二乙三胺五乙酸（ＤＴＰＡ）的疏水性氨基酸、短肽衍生物的Ｇｄ（Ⅲ）螯合物，研究了其磁共振成像造影性能。结果表明：螯合物的急性毒性与Ｇｄ－ＤＴＰＡ相当，自旋－晶格弛豫性能Ｒ＿１比Ｇｄ－ＤＴＰＡ略高。Ｇｄ－ＤＴＰＡ，氨基酸，短肽，急性毒性，自旋－晶格弛豫性能     

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.     

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.     

A carbanion induced synthesis of highly congested pyrazole and imidazole containing heterocycles

An efficient approach to the synthesis of highly congested di, penta and hexacyclic pyrazoles as well as imidazole fragment containing novel heterocyclic molecule has been developed through a carbanion induced transformation of suitably functionalized 2H-pyran-2-ones, benzo[h]chromene and thiochromeno[4,3-b]pyrans. Due to the presence of fluorescence, we report their prime application metal sensor as off/on switching in ferric ions.     

Synthesis of pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles by Curtius reaction in Morita-Baylis-Hillman derivatives

Synthesis of substituted pyrrolo[1,2-a]pyrazines and pyrazino[1,2-a]indoles from the Morita-Baylis-Hillman derivatives of acrylates via saponification followed by Curtius reaction is described.     

正丁胺对激光染料荧光谱影响的研究

用正丁胺作为碳源,采用射频辉光放电制备碳膜,选用激光染料R6G和聚乙二醇混合液作为蒸气源,采用单源热蒸发,在蒸发室与染料同时沉积得到混合膜,用拉曼光谱和红外光谱分析了碳膜的结构和键合方式,分析表明:碳膜中存在胺基团和氢原子.混合膜的荧光谱测量结果表明,认为正丁胺对染料荧光谱的影响是因为胺基和氢原子的存在.     

Selective synthesis of 4,5-dihydroimidazo- and imidazo[1,5-a]quinoxalines via modified Pictet–Spengler reaction

An efficient tandem approach for the selective synthesis of 4,5-dihydroimidazo[1,5-a]quinoxalines 6a–g and imidazo[1,5-a]quinoxalines 7a–h by the reaction of 2-imidazolyl anilines 4a–c with aryl aldehydes 5a–k under mild reaction conditions is described. Introduction of electron releasing alkyl groups in substrates 4a–b was found to be instrumental for the success of the reaction.     

Understanding the Diels-Alder reactivity of 1,2-azaborine analogues

The Diels-Alder reactivity of 1,2-heteroborines (H₄C₄B(H)X, X?=?NH, PH, AsH; O, S, Se) has been computationally explored by means of Density Functional Theory (DFT) calculations. The influence of the HB?=?X fragment on the reactivity of the system has been quantitatively analyzed in detail by means of the so-called Activation Strain Model (ASM) of reactivity. It is found that the interaction between these species and the dienophile is significantly stronger than that computed for their all-carbon isoelectronic counterpart, benzene. In addition, the strain energy plays a key role in the observed reactivity trends. The role of the aromaticity strength of these heteroarenes on the reactivity is also assessed.