共查询到18条相似文献,搜索用时 78 毫秒
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低价钛引起的芳香醛肟的还原偶联反应史达清周龙虎高原戴桂元(徐州师范大学化学系221009)低价钛试剂在有机合成上的应用越来越受到人们的广泛重视。它能引起一元醛、酮和二元醛、酮发生脱氧偶联反应生成烯烃、环烯烃和杂环烯烃[1]。此外,低价钛还能引起其他官... 相似文献
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低价钛引起的醛酮发生脱氧偶联反应生成烯烃,已经成为形成碳—碳键的一种重要方法[1]。此外,低价钛试剂还能引起其它官能团化合物的还原偶联反应[2,3]。最近,我们报道了低价钛试剂引起的分子间不同官能团化合物的交叉还原偶联反应[4,5]。但低价钛试剂引起... 相似文献
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低价钛诱导的芳香邻二酮及α-羟基酮的还原偶联反应侯自杰,刘利军,张建华,李裕林(兰州大学有机化学研究所,兰州,730000)关键词低价钛,芳香邻二酮,芳香α-羟基酮,偶联羰基化合物在低价钛诱导下的还原偶联反应已有深入研究并在有机合成中得到广泛应用[1... 相似文献
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Treatment of aromatic 1 , 2-diketones or aromatic a-hydroxy ketones with an activated low-valent titanium reagent, prepared by reduction of TiCl3·1/3AlCl3 with a Zn-Cu reagent, gave an intermolecular coupling reaction leading to the (Z)-1, 2.3.4-tetraaryl-2-butenes. Apossible coupling reaction process was proposed for the aromatic a-hydroxy ketones. 相似文献
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羰基化合物还原偶合是形成碳-碳键的一种重要方法。本文首次发现此类反应的产物不仅与反应物本身的结构和还原试剂体系有关,还与操作次序有很大关系,且在活性钛表面反应。 相似文献
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The intermolecular reductive cyclization of o-nitrobenzene-sulfonamides with aliphatic ketones induced by TiCl4/Sm system was studied and a series of 3,3-disubstituted-3,4-dihydro-(2H)-1,2,4-benzothiadiazine-1,1-dioxides were synthesized in moderate to high yields under mild and neutral conditions. 相似文献
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Functionalized triarylphosphines are obtained with good yields in a one-step reaction of an equimolar mixture of chlorodiphenylphosphine and an aromatic bromide in NMP or DMF at 110°C in the presence of zinc dust and a catalytic amount of NiBr2(bpy). A possible catalytic pathway is discussed. 相似文献
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XueSenFAN XinYingZHANG YongMinZHANG GuiRongQU 《中国化学快报》2004,15(5):518-520
An efficient synthesis of 2, 3-disubstituted indole derivatives through low-valent titanium induced reductive cyclization of acylamido carbonyl compounds is described. 相似文献
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DU Da-Ming MENG Shuang-Ming WANG Yong-Mei MENG Ji-Ben ZHOU Xiu-ZhongDepartment of Chemistry Nankai University Tianjin China 《中国化学》1995,13(6):520-524
The solid state reactions of p-nitroacetophenone,acetyl-ferrocene with indole were catalyzed by anhydrous zinc chloride or aluminum chloride,and gave exclusively the 1:2 condensation products.The solid state condensation of aromatic ketones with l-phenyl-3-methyl-5-pyrazolone was also investigated,and the 1:1 and 2:1 condensation products were obtained.The structures of eleven new products were determined by IR,MS,1H NMR and elemental analysis. 相似文献
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研究了在低价钛(TiCl~4-Ga)试剂作用下,α,α,α-三卤甲基芳烃的还原偶联反应,得到了脱卤偶联产物-二卤代烯烃、炔烃。 相似文献
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T. Ya. Rubinskaya A. S. Mendkovich N. K. Lisitsina I. P. Yakovlev V. P. Gultyai 《Russian Chemical Bulletin》1993,42(10):1658-1661
Quantum-chemical calculations (CNDO/2) of the theoretical relationship between the rate constants for the dimerization and
self-protonation of radical anions show that dimer formation in the one-electron electroreduction of aromatic carboxylic acids
(benzoic (1), 1-naphthoic (2), and 9-anthroic (3) is most probable for1. It is established that during the constant potential electrolysis (CPE) of1 a mixture of “head-to-tail” dimers is formed in the presence of 0.1M Bu4NClO4 (DMF). Their ratio depends on the amount of electricity passed through the solution. The CPE of 2 in the presence of 20 %
H2O affords 1,4-dihydro-1-naphthoic acid in up to 70 % yield. The high yield (∼70 %) of 9,10-dihydro-9-anthroic acid during
the CPE of 3 can be accounted for by the decomposition of the dimeric product followed by protonation of the anionic species.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 1735–1738, October, 1993. 相似文献