共查询到20条相似文献,搜索用时 343 毫秒
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A. A. Krauze Z. A. Kalme Yu. É. Pelcher É. É. Liepin'sh I. V. Dipan G. Ya. Dubur 《Chemistry of Heterocyclic Compounds》1983,19(11):1202-1207
3-Cyano-4, 6-diaryl-3, 4-dihydropyridine-2-thiones have been synthesized for the first time by the condensation of arylideneacetophenones or 1-piperidino-1-phenyl-2-benzoylethane with cyanothioacetamide and the 1, 1-dicyano-2-aryl-3-benzoylpropane with hydrogen sulfide in the presence of bases. It has been established by PMR spectroscopy that 3-cyano-3,4-dihydropyridine-2-thiones exist in solutions in the form of mixture of cis and trans isomers.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1515–1520, November, 1983. 相似文献
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L. D. Smirnov K. M. Dyumaev N. I. Shuikin I. F. Bel'skii 《Russian Chemical Bulletin》1962,11(12):2148-2149
Summary A new method was proposed for the synthesis of 2,4,6-trialky1-3-hydroxypyridines by the reactions of 3,5-dialkyl-2-acylfurans with ammonia. 相似文献
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Magdesieva N. N. Koloskova N. M. Le Ngi Nguyen 《Chemistry of Heterocyclic Compounds》1977,13(11):1177-1180
A preparative method was worked out for the synthesis of 3,4,6-triaryl-2-pyrones by 1,3-dipolar cycloaddition of selenium arylacylmethylides to diphenylcyclopropenone.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1475–1478, November, 1977. 相似文献
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Sologub L. S. Moshchitskii S. D. Markovskii L. N. Ivashchenko Ya. N. 《Chemistry of Heterocyclic Compounds》1970,6(9):1150-1153
2,3,5,6-Tetrachloropyridine-4-sulfenyl chloride has been prepared, and its reactions with nucleophilic reagents have been examined.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp 1232–1235, September, 1970. 相似文献
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4-(3-Alkylureido)-2, 2, 6, 6-tetramethylpiperidine-1-oxyls are rapidly oxidized by N2O4 or NOCl to 4-(3-alkylureido)-2, 2, 6, 6-tetramethyl-1-oxopiperidinium nitrates and chlorides, which are then nitrosated to 4-(3-alkyl-3-nitrosoureido)-2, 2, 6, 6-tetramethyl-1-oxopiperidinium salts. The perchlorates of the latter were prepared by an exchange reaction with HClO4. The nitrosation of alkylureidooxoammonium salts is the first example of chemical modification of oxoammonium derivatives in which the highly reactive >N+=O group is inert toward the reagent.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 542–547, March, 1993. 相似文献
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New Syntheses and Crystal Structures of Bis(fluorophenyl) Mercury, Hg(Rf)2 (Rf = C6F5, 2, 3, 4, 6‐F4C6H, 2, 3, 5, 6‐F4C6H, 2, 4, 6‐F3C6H2, 2, 6‐F2C6H3) Bis(fluorophenyl) mercury compounds, Hg(Rf)2 (Rf = C6F5, C6HF4, C6H2F3, C6H3F2), are prepared in good yields by the reactions of HgF2 with Me3SiRf. The crystal structures of Hg(2, 3, 4, 6‐F4C6H)2 (monoclinic, P21/n), Hg(2, 3, 5, 6‐F4C6H)2 (monoclinic, C2/m), Hg(2, 4, 6‐F3C6H2)2 (monoclinic, P21/c) and Hg(2, 6‐F2C6H3)2 (triclinic, P1) are described. 相似文献
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N. S. Prostakov N. N. Mikheeva Dkharvar Pkhal'gumani 《Chemistry of Heterocyclic Compounds》1967,3(2):539-540
1,2,5-Trimethylpiperid-4-one is used to prepare 1, 2, 5-trimethyl-4-aminopiperidine, which is then converted to 1, 2, 5-trimethyl-4-(diethylaminoacetylamino)piperidine. Amination of 2, 5-dimethyl-4-phenylpyridine is effected, and 3, 6-dimethyl-4-phenyl-2-aminopyridine is thereby obtained. 相似文献
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哌啶酮催化氢化制备哌啶醇催化剂的研究 总被引:1,自引:0,他引:1
研究了2,2,6,6-四甲基-哌啶酮-4-催化氢化合成2,2,6,6-四甲基-哌啶醇-4。重点研究催化剂种类对催化反应的影响。确定RaneyNi(4)为最适宜催化剂,并对其最佳用量进行了研究。对哌啶酮催化氢化的反应历程进行了探讨。选用常压塔式反应器进行氢化。对其它有关工艺参数进行研究,确定最佳条件:哌啶酮浓度为30%,20%异丙醇水溶液为溶剂、催化剂用量为20%、温度为80℃、时间为2h,哌啶醇产率97.3%,m.p.130.0-131.0℃。 相似文献
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N. S. Prostakov G. A. Vasil'ev V. P. Zvolinskii A. V. Varlamov A. A. Savina O. I. Sorokin N. D. Lopatina 《Chemistry of Heterocyclic Compounds》1975,11(8):971-975
The previously unknown 3-alkyl-2,4,6-triphenylpyridines were obtained from 1-methyl-3-alkyl-2, 6-diphenyl-4-piperidones. It was established that a mixture of 1,3-diphenyl-4-azafluorene and 1,3-diphenyl-2-azafluorene is formed in the dehydrocyclization of 3-methyl-2,4,6-triphenylpyridine. 相似文献
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2,2,4,4—四对羟甲基酚氧基—6,6—二苯基三聚磷腈的合成 总被引:10,自引:0,他引:10
通过Friedel-Crafts反应,将本基引入到六氯环三磷腈上,然后由亲核取代反应和氢化还原反应,合成了2,2,4,4-四对羟甲基酚氧基-6,6-二苯基三聚磷腈,探索了各步的合成、分离方法,并对化合物的结构进行了表征. 相似文献
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多硝基多氨基三唑类衍生物作为含能材料,具有高氮、致密、钝感等优点。本文通过3-氨基-1,2,4-三唑和三硝基三氯苯的缩合,再经过三唑碳原子上的硝化反应和芳环上的氨化反应,合成并鉴定了标题化合物。 相似文献
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V. I. Tyvorskii L. S. Stanishevskii I. G. Tishchenko 《Chemistry of Heterocyclic Compounds》1978,14(7):721-724
The reaction of a number of aliphatic and alicyclic acetloxiranes with perfluoroalkanoic acid esters was studied. It is shown that substituted 3-hydroxy-6-perfluoroalkyl-2,3-dihydro-4-pyrones are formed. The reverse reaction scheme, including the formation of an intermediate -diketone and cyclization of its enol form to a dihydropyrone, was confirmed in the case of the condensation of 3-methyl-2,3-epoxycyclohexanone with ethyl trifluoroacetate. The stereochemistry of the reaction products, which exist in a half-chair confirmation with a pseudoequatorial hydroxyl group, was examined by means of PMR spectroscopy.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 897–900, July, 1978. 相似文献
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M. Adnan Atfah 《Journal of heterocyclic chemistry》1989,26(3):717-719
The reactions of 3, 6-diphenyl-1, 2, 4, 5-tetrazine 1 and 3, 6-di(2-pyridyl)-1, 2, 4, 5-tetrazine 2 with the enamines 3a-d derived from morpholine and the 5-,6-,7- and 8-membered cyclic ketones have been investigated. A number of pyridazine derivatives 4–7 most of which are new have been reported. Moreover, a novel procedure for the aromatization of pyridazines 5a-d to the corresponding pyridazine 7b-d via oxidative elimination using hydrogen peroxide is described. The structures of products 4–7 were confirmed by spectral methods and elemental analysis. 相似文献