庆大霉素与3,5—二溴水杨醛的缩合反应及其应用

本文研究了庆大霉素与３，５－二溴水杨醛缩合成席夫碱的条件及其应用，在加热条件下，庆大霉素与３，５－二溴水杨醛缩合成亮黄色席夫碱，其分子反应比为，庆大霉素＋３，５－二溴水杨醛＝１＋１，据此提出了庆大霉素生物效价总量的光度测定法，庆大霉素在０～１１８．９μｇ／ｍＬ内符合比尔定律，λｍａｘ＝４３０ｎｍ表观摩尔吸光系数ε＝９．９８×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１本法干扰少，重现性好。     

水杨醛缩—5—碘—5—氨基喹啉的合成及荧光光度法测定煤渣中痕量镓的研究

报道了新息夫碱试剂水杨醛缩－５－碘－５－氨基喹啉（ＳＡＩＡＱ）的合成。用元素分析、红外光谱法确定了其结构。测定了ＳＡＩＡＱ的酸度常数Ｋａ１＝２．４０×１０＾－４，Ｋａ２＝２．９８×１０＾－９。在ｐＨ３．５０￣５．００范围内ＳＡＩＡＱ与Ｇａ＾３＋形成稳定的荧光螯合物，且在λｅｘ／λｅｍ＝４２８ｎｍ／５４０ｎｍ产生强烈荧光。其荧光强度与Ｇａ＾３＋的浓度在１．５μｇ／Ｌ￣２６０μｇ／Ｌ范围内呈线性关系，     

新席夫碱3,5—二溴水杨醛缩氨基硫脲的合成及其分析应用研究：Ⅰ…

本文研究了新席夫碱３，５－二溴水杨醛缩氨基硫脲（简称３，５－ＤＢＳＴＳ）的合成及其分析应用，提出了基于荧光熄灭测定微量银的分析方法。该法测定银简单，快速，灵敏。检出限为５．５４μｇ／Ｌ；选择性和再现性均佳。     

新西佛碱3．5－二溴水杨醛缩氨基硫脲的合成及其在荧光滴定中的应用

本文研究了新西佛碱３．５－二溴水杨醛缩氨基硫脲（简称３．５－ＤＢＳＴＳ）的合成，及其作为一种新型荧光滴定指示剂，应用于有色溶液中酸碱滴定的条件，建立了一种简便、准确、快速测定有色溶液中酸碱浓度的新方法，用于有色饮料中殴含量的测定，结果满意，指示剂发荧光的ｐＨ突跃范围为７．４８～９．７２，λ＿（ｅｘ）＝３８５ｎｍ，λ＿（ｅｍ）＝５００ｎｍ。     

新西佛碱3.5—二溴水杨醛缩氨基硫脲的合成及其在荧光滴定中的应用

本文研究了新西佛碱３．５－二溴水杨醛缩氨基硫脲（简称３．５－ＤＢＳＴＳ）的合成，及基为一种新荧光滴定指示剂，应用于有色溶液中酸碱滴定的条件，建立了一种简便，准确，快速测定有色溶液中酸碱浓度的新方法，用于有色饮料中酸含量的测定，结果满意，指示剂发光的ｐＨ突跃范围为７．４８－９．７２，λｅｘ＝５００ｎｍ。     

水杨醛缩-5-碘-8-氨基喹啉的合成及荧光光度法测定煤渣中痕量镓的研究

报道了新息夫碱试剂水杨醛缩－５－碘－８－氨基喹啉（ＳＡＩＡＱ）的合成。用元素分析、红外光谱法确定了其结构。测定了ＳＡＩＡＱ的酸度常数Ｋａ１＝２．４０×１０－４，Ｋａ２＝２．９８×１０－９。在ｐＨ３．５０～５．００范围内ＳＡＩＡＱ与Ｇａ３＋形成稳定的荧光螯合物，且在λｅｘ／λｅｍ＝４２８ｎｍ／５４０ｎｍ产生强烈荧光。其荧光强度与Ｇａ３＋的浓度在１．５μｇ／Ｌ～２６０μｇ／Ｌ范围内呈线性关系，检出限１．５μｇ／Ｌ，考察了共存离子的影响，选择性高。已应用于煤渣中痕量镓的分析。     

13，15－苯并－1，4，8，11－四硫杂环十六烷及其钯（Ⅱ）络合物的合成和结构测定

报导了硫冠醚１３，１５－苯并－１，４，８，１１－四硫杂环十六烷（ＴＴｍＸ）及其钯（Ⅱ）络合物（ＴＴｍＸ·２ＰｄＣ＿ｌ２）的合成，并通过Ｘ射线衍射分析测定了该配体及其络合物的晶体结构。ＴＴｍＸ属单斜晶系，Ｐ＿２＿１／ｎ空间群，晶胞参数：ａ＝９．５４５（３），ｂ＝９．０６５（１），ｃ＝１９．６４５（３）Ａ，β＝９５．３８（１）°，Ｖ＝１６９２．３（５）Ａ￣３，Ｚ＝４，μ＝５．２６ｃｍ￣（－１），Ｄｃ＝１．３０ｇ·ｃｍ￣（－３）。ＴＴｍＸ·２ＰｄＣｌ＿２属正文晶系，Ｐｂｃａ空间群，晶胞参数：ａ＝１１．３９２（２），ｂ＝１４．５８０（４），ｃ＝２７．１４６（９）Ａ，β＝９０．００（０）°，Ｖ＝４５０９（２）Ａ￣３，Ｚ＝８，μ＝２４．１２ｃｍ￣（－１），Ｄｃ＝２．０２ｇ·ｃｍ￣（－３）。     

对称三唑Schiff碱与铜的配合物合成及性能

合成了４种新型对称三唑水杨醛Ｓｃｈｉｆ碱的铜配合物［ＣｕＬ１Ｃｌ２］（Ⅰ）和三核配合物［Ｃｕ３（Ｌ２－Ｌ４）２Ｃｌ４］·ｎＨ２Ｏ（Ⅱ～Ⅳ），其中Ｌ１，Ｌ２，Ｌ３和Ｌ４分别为４－氨基－１，２，４－三唑、４－氨基－３，５－二甲基－１，２，４－三唑、４－氨基－３，５－二乙基－１，２，４－三唑和４－氨基－３，５－二羟甲基－１，２，４－三唑的水杨醛Ｓｃｈｉｆｆ碱．经元素分析、电导、红外光谱、热重分析、电子光谱、ＥＳＲ和变温磁化率表征，该类配合物为畸变四方构型．配合物Ⅱ的变温磁化率表明，铜离子间存在弱的反铁磁相互作用，Ｊ＝－１８．９ｃｍ－１，ｇ＝２．０８，Ｆ＝２．７×１０－３．配合物对Ｂ细胞增殖有抑制作用．     

5，10，15，20－四（3－溴－4－磺酸苯基）卟啉光度法测定痕量铜的研究

本文研究了新水溶性卟啉试剂５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉［Ｔ（３－ＢｒＰ）ＰＳ＿４与铜的显色反应。在ｐＨ３，铜与５，１０，１５，２０－四（３－溴－４－磺酸苯基）卟啉形成１：１的稳定配合物。此配合物的最大吸收波长位于４１２．８ｎｍ，摩尔吸光系数为２．６１×１０￣５Ｌ·ｍｏｌ￣（－１）·ｃｍ￣（－１）。铜量在０～３．０μｇ／２５ｍＬ范围内符合比尔定律，工作曲线回归方程为ｙ＝０．００９４３、＋０．１６７ｘ，相关系数为ｒ＝０．９９９７。方法有较高的灵敏度和较好的选择性，直接用于大米和茶叶中痕量铜的测定，结果与ＡＡＳ法一致。     

β─烷氧羰乙基三氯化锡与2─羟基─1─萘醛缩苯胺类席夫碱配合物的合成与结构

合成并表征了１４种β－烷氧羰乙基三氯化锡与２－羟基－１－萘醛缩苯胺类席夫碱配合物。测定了其中β－丁氧羰乙基三氯化锡与２－羟基－１－萘醛缩对甲苯胺席夫碱配合物的晶体结构。晶体属于三斜晶系，Ｐ１－空间群。晶胞参数：ａ＝１．２４８７（６）ｎｍ，ｂ＝１．３５５１（７）ｎｍ，ｃ＝０．９３８５（３）ｎｍ，α＝９２．８５（３）°，β＝１０４．６８（３）°，γ＝７０．４３（４）°，Ｖ＝１．４４６４（１）ｎｍ３，Ｄｃ＝１．３３ｇ／ｃｍ３，Ｚ＝２，Ｆ（０００）＝５８８。配合物为畸变的八面体构型，配体以酚羟基氧原子与锡原子配位，分子内存在着羰基氧原子与锡原子的配键     

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%.     

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.     

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.     

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.     

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.     

Chemistry of heterocyclic compounds at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, over 50 years (Review)

The review contains a concise historical account and information on the most significant researches undertaken by the staff at the A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences on the Chemistry of Heterocyclic Compounds. Dedicated to Academician of the Russian Academy of Sciences B. A. Trofimov on his 70th jubilee. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1443–1502, October, 2008.