共查询到20条相似文献,搜索用时 15 毫秒
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《Polyhedron》1999,18(6):799-806
The anion 2-(5-amino-3,4-dicyano-2H-pyrrol-2-ylidene)-1,1,2-tricyanoethanide (L′, C11H2N7−), after isomerization to 1,2,6,7-tetracyano-3,5-dihydro-3,5-diimino-pyrrolizinide (L), forms different metal-complexes with mercury depending on the experimental conditions. Pure compounds were isolated from the reactions HL+CH3HgAc in CH3CN and NaL′+HgAc2 in AcH/H2O. They are CH3HgL and HgL2. From their optical spectra, compared to those of phthalocyaninato- or other well-known pyrrolizinato-complexes, the coordination geometry of Hg(II) in these species is supposed to be trigonal planar and trigonal monopyramidal, respectively. CH3HgL was characterized also by 1H NMR: (CD3CN, δ, ppm) 0.886 (CH3), 8.733 (NH). From the reactions in water between NaL′ and HgCl2 or HgClO4 complex mixtures of polynuclear complexes were isolated of composition: 0.826 [Hg2ClL2(OH)]·0.174 [Hg4L3(OH)5]·2.06 H2O (A) or 0.588 [Hg2L2]·0.412 [Hg2L(OH)3]·3.53 H2O (B), respectively. The formulae A and B were based on thermogravimetric and elemental analysis data. Indirect evidences, based on XPS data, for the existence of the pyrrolizinato–Hg(I) complex are also given. 相似文献
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Daniel Barillier 《Phosphorus, sulfur, and silicon and the related elements》2013,188(2):251-255
Abstract Sulfurization of 2-acetoxy or 2-benzoyloxy-1,3-propanediones gives the corresponding 1,2-dithiolylium salts which are used as starting materials for preparation of 1,2-dithiolylium-4-olates. The reaction was studied under different conditions in order to obtain the best sulfurization yields. A new 3-p-dimethylaminophenyl-5-phenyl-1,2-dithiolylium-4-olate is also described. It is formed by nucleophilic attack on a 3-alkylthio substituted or a 5 unsubstituted position of a 1,2-dithiolylium ion by N, N-dimethylaniline. 相似文献
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B. V. Suvorov A. D. Kagarlitskii N. A. Belova R. T. Kutzhanov 《Chemistry of Heterocyclic Compounds》1973,9(6):751-752
Pyridine-3,5-dicarboxylic acid was synthesized by oxidative ammonolysis of 3,5-lutidine and hydrolysis of the resulting 3,5-dicyanopyridine.Communication XCIV from the series Oxidation of Organic Compounds; see [1] for communication XCIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 819–820, June, 1973. 相似文献
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A series of 3,5-disubstituted-1,2,4-oxadiazoles ( 2 ) were prepared from a mono- or dichlorophenyl-substituted amidoxime and (i) an acid chloride, (ii) an isatoic anhydride, or (iii) a β-keto ester. Although cyclizations of the same amidoximes with acetaldehyde gave 4,5-dihydro-5-methyl-substituted derivatives ( 5 ), that annulation procedure either failed or gave low yields with other aldehydes. A novel alternative method, the diborane reduction of 2 , has been found to be a generally applicable procedure for preparing 5 . The reduction is regioselective, i.e., only the 4,5-(C=N) linkage is reduced even when a large excess of diborane is present. 相似文献
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Nobuhiro Kanomata Hisashi Nagahara Masaru Tada 《Journal of heterocyclic chemistry》1992,29(6):1567-1571
Structural modification of NAD(P) model compounds, N,N,N',N'-tetramethylpyridine-3,5-dicarboxamide ( 1 ), pyridine-3,5-dicarbonitrile ( 2 ), and 4-methylpyridine-3,5-dicarbonitrile ( 3 ), have been explored by the reaction with alkyl radicals such as the 1-adamantyl, tert-butyl, and isopropyl radicals. The alkyl substitutions of compounds 1 , 2 , and 3 with the 1-adamantyl and the tert-butyl radical gave both 2-mono and 2,6-disubstitution products, whereas the reaction of compound 2 with the isopropyl radical gave 2-mono 6c , 2,4-di 7c, 2,6-di 8c , and 2,4,6-trisubstitution 9c products. 相似文献
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Jensen JO 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2002,58(7):1461-1471
The vibrational frequencies and corresponding normal mode assignments of 3,5-dibromo-1,2,4-trithia-3,5-diborolane (B2S3Br2) are examined theoretically using the Gaussian98 set of quantum chemistry codes. All normal modes were successfully assigned to one of six types of motion predicted by a group theoretical analysis (B-S stretch, B-Br stretch, S-S stretch, S-B-S bend, B-Br wag, B(SSBr) umbrella motion) utilizing the C2v symmetry of the molecule. The vibrational modes of the naturally isotopically substituted (1-10B and 2-10B) forms of B2S3Br2 were also calculated and compared against experimental data. The molecular orbitals of B2S3Br2 are examined. The calculations suggest that a considerable amount of pi bonding occurs in B2S2Br2. 相似文献
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SEIKEL MK 《Journal of the American Chemical Society》1948,70(10):3344-3347
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The title compounds, C7H4I2O2 1 and C13H7I2N2O3 2, have been synthesized and characterized by single-crystal X-ray diffraction. Compound 1 crystallizes in monoclinic, space group P21/c with a = 9.802(2), b = 13.867(3), c = 7.364(2) A, β = 109.74(3)°, V= 942.1(3) A^3, Dc= 2.636 g/cm^3, C7H4I2O2, Mr= 373.90, F(000) = 672, μ = 6.627 mm^-1, Z = 4, R = 0.0459 and wR = 0.1018 for 1805 observed reflections (I 〉 2 σ(I)). Compound 2 belongs to the monoclinic system, space group P21/n with a = 9.015(2), b = 12.024(2), c = 14.072(3) A, β = 103.91(3)°, V = 1480.6(5) A^3, Dc= 2.216 g/cm^3, C13H7I2N2O3, Mr= 494.01, F(000) = 920, p = 4.255 mm^-1, Z = 4, R = 0.0777 and wR = 0.1757 for 2896 observed reflections (I 〉 2σ(I)). Compounds 1 and 2 were assayed for antibacterial activities against three Gram positive bacterial strains (B. subtilis, S. aureus and S. faecalis) and three Gram negative bacterial strains (E. coli, P. aeruginosa and E. cloacae) by MTr method. Fortunately, compound 2 is found to show potent antibacterial activity against these six bacterial strains. 相似文献
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3,5-二烷氧基甲苯的溴化反应研究 总被引:1,自引:0,他引:1
3,5-二甲氧基甲苯在偶氮二异丁腈的存在下与N-溴代丁二酰亚胺(NBS)反应,产物不是3,5-二甲氧基苄溴,而是2-溴-3,5-二甲氧基甲苯和2,6-二溴-3,5-二甲氧基甲苯.同样条件下,3,5-二乙酰氧基甲苯与NBS反应则生成3,5-二乙酰氧基苄溴.GAUSSIAN 03计算的结果表明,3,5-二甲氧基甲苯中苯环碳原子上的电荷密度高于侧链上碳原子上的电荷密度,因此溴自由基更容易取代苯环上的氢,而3,5-二乙酰氧基甲苯的情况恰好相反,故产物是3,5-二乙酰氧基苄溴. 相似文献
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K. Garkushenko M. A. Makarova O. P. Sorokina N. V. Poendaev M. A. Vorontsova G. P. Sagitullina 《Chemistry of Heterocyclic Compounds》2011,47(4):482-486
Previously unknown 3,5-diaroylpyridines have been synthesized by the condensation of 1,3-diketones according to the Hantzsch
reaction. 相似文献