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官能团化的联烯在过渡金属钯物种催化下的偶联环化反应作为一种有效的合成含氮、氧杂环的方法已经受到越来越多的重视[1].但是,联烯胺与烯丙基溴的偶联环化反应还没有被深入的研究过.我们组对钯催化下联烯醇与烯丙基溴的反应进行了一些研究[2],并基于此进行了联烯胺与烯丙基溴的偶联环化反应的研究.我们经过研究发现,可以通过二价钯催化,高效地经由α或β联烯胺与烯丙基溴的反应得到2,5-二氢吡咯或1,2,3,6-四氢吡啶类化合物,并且经过研究证明反应是通过二价钯的催化循环历程进行的. 相似文献
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Yamamoto等曾报道烯丙基型的锡有机化合物可与羰基化合物进行亲核加成反应,得到高烯丙基型的醇.他们还发现此反应具有立体选择性.此后又发现这个反应可以被溶剂中的微量水所催化,使反应加速进行.这些结果促使我们进一步探讨当醛分子中含有羟基、酚基、硝基、卤素等各种不同的反应活性基团时,与烯丙基锡进行的反应.希望找到一种用传统的Grignard试剂无法直接进行的烯丙基化反应. 我们选择了间和邻羟基苯甲醛、间和对硝基苯甲醛、对溴苯甲醛、7-羟基-3,7-二甲基辛醛等化合物作反应底物,在金属锡粉存在下使羰基化合物与烯丙基溴反应.结果都得到了相应的高烯丙基醇. 相似文献
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1968年(O)fele Wanzlick首次合成了N-杂环卡宾金属配合物,但是没有引起人们的重视[1-2],直到1991年Arduengo得到了稳定的N-杂环卡宾,才引起化学界的广泛注意与重视[3].随后,Herrmann等人将N-杂环卡宾金属配合物应用在催化领域,如烯烃复分解反应、偶联反应、硅氢化反应、烯烃氢甲酰化反应、炔烃聚合反应、烯烃环丙化反应、芳基硼酸对醛的加成反应、醛的烯丙基化反应等[4]. 相似文献
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G.-P. Blümer und M. Zander 《Fresenius' Journal of Analytical Chemistry》1977,288(4):277-280
Zusammenfassung Von 38 polycyclischen aromatischen Systemen (Biaryle, kondensierte Aromaten, Aza-aromaten) wurden die k-Werte an mit Nitrophenyl-Gruppen modifiziertem Kieselgel gemessen. Für die drei untersuchten Verbindungsklassen bestehen unterschiedliche Korrelationen zwischen k-Wert und C-Zahl. Da die Reihenfolge der Elution von kondensierten Aromaten und Aza-aromaten unabhängig von der C-Zahl ist, wird eine gruppenspezifische Trennung der beiden Verbindungsklassen möglich.
Behaviour of biaryls, condensed aromatics and azaaromatics in high-pressure liquid chromatography using silica modified with nitrophenyl groups (group separation of condensed aromatics and azaaromatics)
Summary k-Values have been measured of 38 polycyclic aromatic systems (biaryls, condensed aromatics, azaaromatics) using silica modified with nitrophenyl groups. Different correlations between k value and C number exist for the three classes of compounds studied. Since the order of elution of condensed aromatics and azaaromatics is independent of C number a group separation of both classes of compounds becomes possible.
Herrn G. Biadala danken wir für wertvolle experimentelle Hilfe. 相似文献
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Wanda Sliwa 《Chemistry of Heterocyclic Compounds》1994,30(2):131-153
In the present review dealing with the reactivity of N-substituted azaaromatics their reduction as well as reactions proceeding on ring carbon atoms and on nitrogen atoms are described; also the reactivity of porphyrins and of complexes possessing these systems is reported. 相似文献
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Wanda Sliwa 《Chemistry of Heterocyclic Compounds》1997,33(1):17-32
Cyclization reactions of quaternary salts of azaaromatics including inter- and intramolecular condensation as well as radical processes are described.Institute of Chemistry, Pedagogical University, Czestochowa, Poland. Published in Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 23–40, January, 1997. 相似文献
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Preparation of alkyl derivatives of thiouracils and thioxanthines has been carried out by ring cyclization1 and sulfurization of alkyl derivatives of uracil and xanthines with phosphorus pentasulfide.2–4 However, direct alkylation of thiouracils and thioxanthines has been described by a limited number of papers using dimethyl sulfate,5,6 methyl iodide,7,8 etc. Previously we reported that trimethyl phosphate (TMP) was useful for N-methylation of various azaaromatics.9 In view of the recent biological interest on methyl derivatives of natural products,10 we wish to communicate here the reactions of thiouracils and thioxanthines with TMP. 相似文献
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Alia Jouhara Eric Quarez Franck Dolhem Michel Armand Nicolas Dupr Philippe Poizot 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(44):15827-15831
The ever‐increasing demand for rechargeable batteries induces significant pressure on the worldwide metal supply, depleting resources and increasing costs and environmental concerns. In this context, developing the chemistry of anion‐inserting electrode organic materials could promote the fabrication of molecular (metal‐free) rechargeable batteries. However, few examples have been reported because little effort has been made to develop such anionic‐ion batteries. Here we show the design of two anionic host electrode materials based on the N‐substituted salts of azaaromatics (zwitterions). A combination of NMR, EDS, FTIR spectroscopies coupled with thermal analyses and single‐crystal XRD allowed a thorough structural and chemical characterization of the compounds. Thanks to a reversible electrochemical activity located at an average potential of 2.2 V vs. Li+/Li, the coupling with dilithium 2,5‐(dianilino)terephthalate (Li2DAnT) as the positive electrode enabled the fabrication of the first all‐organic anionic rechargeable batteries based on crystallized host electrode materials capable of delivering a specific capacity of ≈27 mAh/gelectrodes with a stable cycling over dozens of cycles (≈24 Wh/kgelectrodes). 相似文献
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聚吡咯的合成与新型双离子电池性能研究 总被引:10,自引:0,他引:10
用反相微乳聚合法制备了十二苯磺酸(DBSA)掺杂的导电聚吡咯纳米材料, DBSA既作为表面活性剂又作为掺杂剂, 能够提高聚吡咯的导电性. 用制备出的DBSA-PPy 为正极材料, 石墨为负极材料组装双离子电池, 测试结果表明, C/DBSA-PPy 电池的电化学性能已达到传统锂离子电池的水平, 这是因其具有较高的导电性和特殊掺杂结构的聚吡咯使其电化学性能得到优化. 相似文献
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本文考察了不同制备方法、不同种类的光敏剂对以苯并三氮唑银为银源的光敏热成像材料感光性能的影响。结果显示原位法中以AgI和AgBrI为光敏剂的PTG材料具有较高的感光度,分别为以AgBr为光敏剂的参比样片感光度的16倍和2.4倍;异位法制备的PTG材料中,以AgBrI乳剂为光敏剂的感光度比以AgBr为光敏剂的感光度高,是其3倍;此外,同是以AgBr为光敏剂、用异位法制备的PTG材料的感光度比原位法制备的PTG材料感光度高。文中初步分析讨论了出现以上实验结果的原因。 相似文献