共查询到20条相似文献,搜索用时 46 毫秒
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《化学通报》1989,(2)
O协。N00。闪00。NO仍。门00。价00.州O叭。N00。N00。价00。曰00。仍00。NO叭。N00。NO叭。NON。1O叭。N00。NO口户N00。N00。N00 .2O叭。NO仍。阶O叭。N恤习l四1尺!浑号。补半甥冷坎卜O﹃邢日补牟欢咨比解琴劣卞穴答.’补妞小佘褪众吝︸补牟别滓穴名︸朴牟澎褥尺g︹补习书叹权一09旧哄习。谧补故补半哭长习汉任中成外曰州。066一闪一。一协6一Z一.一66一内一。1661州一。1661刊一.一66一10.16伍一刊︸。1661叫︻.0661州一。1661N一。︻661N工.1661N一。︻661N一。一66︻囚州。1661一0.州66一囚一。工比61一O。叫6小︻州0.问… 相似文献
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以wag/P”-AI。O。为固体电解质的CO。、SO。、NO。等气体传感器的研究已有很多报道[‘-‘],多采用的是个AI。O。结构的电解质。AI刀。和p”-AI刃。的结构具有一定的相似性,但后者具有更高的迁移离子浓度和更开放的晶体结构,表现出更好的离子导电性‘’‘.由于卢”-AI。O。为介稳结构,需要加入如Li。O、MgO等作为稳定剂才能稳定存在.以Li对稳定的产”-al。O。烧结较容易,P”-AI。O。相转化率高,但以MsO为稳定剂制备的”-AI刃。其显微结构和抗吸湿性能更为优越.LJLi对和MgO共同稳定的产”-AI。O。可以… 相似文献
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第26届国际化学奥林匹克竞赛理论试题答案吴国庆编译(北京师范大学化学系100875)8一@(a)HL十H。O—H。O十十L-K。。一1.4·10-‘;C。。一3.00·回旷’K。。一[H。O”]’/{C。。一[H。O”」}(·;C/K—3·10-’/... 相似文献
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TiO2-Al2O3作为Mo催化剂担体的研究 总被引:6,自引:0,他引:6
Tio。-AI。oa二元氧化物的制备at艺大体可分为两种.一种是利用液相浸渍或气相沉积方法将Tio。担载在AI。0。上,使Tio。主要覆盖在AI。0。表面上[‘-1另一种是通过Ti盐和AI盐混合溶液共沉淀方法使Tio。和AI。0。均匀混合在一起【‘-’1.不同的制备工艺对Tio。-AI。03的表面结构和表面性质有很大影响问.我们曾报导用TICly蒸气化学气相沉积方法制备出了D02在1川2O3表面呈现十分均匀分布的DoZ一周。03复合氧化物担体*’1.本文进一步考察D0。在周。0。表面的沉积对川。0。孔结构的影响,以及Ti02-A1203作为加氢精制MO催… 相似文献
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Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction
Laurent Gavara Thomas Boisse Jean-Pierre Hénichart Adam Daïch Philippe Gautret 《Tetrahedron》2010,66(38):7544-5571
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. 相似文献
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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. 相似文献
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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. 相似文献
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N. A. Nedolya 《Chemistry of Heterocyclic Compounds》2008,44(10):1165-1219
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. 相似文献
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Uroš Grošelj Mojca Žorž Amalija Golobič Branko Stanovnik Jurij Svete 《Tetrahedron》2013,69(52):11092-11108
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. 相似文献
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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. 相似文献
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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. 相似文献
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Rebecca J. Burton Mandy L. CrowtherNeal J. Fazakerley Shaun M. FilleryBarry M. Hayter Jason G. KettleCaroline A. McMillan Paula PerkinsPeter Robins Peter M. SmithEmma J. Williams Gail L. Wrigley 《Tetrahedron letters》2013
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. 相似文献
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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%). 相似文献