共查询到20条相似文献,搜索用时 31 毫秒
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Udo Beckmann Gerhard Hägele 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):404-430
Abstract Planar chiral and achiral arenido(triphenylphosphane)nickel(II) complexes (arenido = mesitylenido, 2-toluenido) comprising electronically delocalised N,O chelating ligands were studied by 1H and 19F NMR using 1D and 2D techniques. Results from complexes and corresponding ligands are discussed in the light of molecular structures obtained from X-ray diffraction. GRAPHICAL ABSTRACT 相似文献
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M. T. Ben Dhia M. A. K. Sanhoury K. Essalah M. R. Khaddar 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1922-1931
Abstract Four octahedral complexes of the type SnCl4.2L [L = (R2N)3P(E): E = Se; R = Me(1), Et(2) and E = S; R = Me(3), Et(4)] have been studied in solution by multinuclear (31P, 77Se, and 119Sn) NMR spectroscopy. 31P and 77Se NMR data were informative of changes associated with complex formation. The solution structure of the complexes was confirmed by their 119Sn NMR spectra that showed two triplet features for each complex, attributed to a mixture of the expected cis and trans isomers. The triplet signal is due to the coupling with two equivalent phosphorus atoms, consistent with an octahedral geometry around the tin center. In addition, density functional theory (DFT)/B3LYP calculations have been carried out to support the interpretations of NMR data. The results are discussed and compared with those reported for related complexes. GRAPHICAL ABSTRACT 相似文献
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Nazariy T. Pokhodylo Vasyl S. Matiychuk 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1895-1901
Abstract 1-Aryl-1H-1,2,3-triazole-4-carbonyl chlorides were selected as starting materials for the Boulton–Katritzky rearrangement. When 3-amino-5-methylisoxazole was acylated by 1-aryl-1H-1,2,3-triazole-4-carbonyl chlorides, 1-aryl-5-methyl-N-(5-methylisoxazol-3-yl)-1H-1,2,3-triazole-4-carboxamides 5 were obtained and no further rearrangement occurred. On the other hand, when 1-aryl-1H-1,2,3-triazole-4-carbonyl chlorides were first converted into isothiocyanates by the reaction with KSCN and then were allowed to react with 3-amino-5-methylisoxazole 4 in one pot, intermediate thioureas were formed and spontaneously transformed in statu nascendi into 1,2,4-thiadiazole derivatives 6. GRAPHICAL ABSTRACT 相似文献
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Dariusz Cal Piotr Zagórski 《Phosphorus, sulfur, and silicon and the related elements》2013,188(12):2295-2302
Abstract New trifluoromethyl-functionalized 2-phosphonopyrroles were obtained by 5-exotrig cyclization of trifluoromethyl and phosphonyl functionalized enaminoketones. GRAPHICAL ABSTRACT 相似文献
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Faramarz Rostami Charati Zinatossadat Hossaini Mohammad R. Hosseini-Tabatabaei 《Phosphorus, sulfur, and silicon and the related elements》2013,188(7):1443-1448
Abstract Stable derivatives of oxaphospholes were obtained from the reaction between electron-deficient acetylenic compounds and phenacyl bromide or its derivatives in the presence of triphenylphosphine in acetonitrile as the solvent in excellent yields. GRAPHICAL ABSTRACT 相似文献
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Sergey A. Lermontov Alena N. Malkova El'mira Kh. Lermontova Andrei V. Churakov 《Phosphorus, sulfur, and silicon and the related elements》2013,188(1):178-188
Abstract A new method of silica dissolution is described. It involves the formation of a stable SiF4 · n ROH complex (1, 1a) just from SiO2 and anhydrous alcoholic HF generated in situ from commercially available hexafluoropropene oxide. Alcoholic SiF4 complexes can be easily converted to different organosilicon compounds of the type SiF4L2 and (LH)2SiF6 [L = 1,10-phenantroline (2a), 2,2′-dipyridyl (2b), Me2SO (2c), pyridine (2d), triethanolamine (3a)]. Different silica-containing compounds can be used in this strategy—silicagel, sand, alumosilicates, and even rice husk. GRAPHICAL ABSTRACT 相似文献
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Mehmet Gülcan Mehmet Sönmez 《Phosphorus, sulfur, and silicon and the related elements》2013,188(9):1962-1971
Abstract Monobasic tridentate Schiff base ligand having ONS donor sequence was prepared by condensing N-aminopyrimidine-2-thione with o-vanillin. The complexes were formed by reacting ligand and the metal acetates of Cu(II), Ni(II), Co(II), Mn(II), and Cd(II) in methanol to get a series of mononuclear and dinuclear complexes. The characterization of ligand and metal complexes were carried out by elemental analyses, conductivity measurements, magnetic susceptibility data, FTIR, UV-vis, NMR, and API-ES mass spectral data. The structure of the complexes was confirmed on the basis of elemental analyses, magnetic susceptibility, API-ES mass spectral data and thermal gravitational analysis (TGA). GRAPHICAL ABSTRACT 相似文献
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Mohanbabu Maradolla G. V. P. Chandramouli 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):1650-1654
Abstract A simple and environmentally benign synthesis of 2-amino-1,3-selenazoles by microwave irradiation using 1-butyl-3-methylimidazolium tetrafluoroborate ([Bmim]BF4) ionic liquid (IL) is described. Acyl halides, phenacyl halides, and α-bromo-β-keto esters easily undergo condensation with selenourea in ([Bmim]BF4) by microwave irradiation to afford the desired products of good purity in excellent yields. The ionic liquid can be easily recovered and reused at least 10 times without losing its activity. The duration of the reaction ranges from 4–6 min. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. GRAPHICAL ABSTRACT 相似文献
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Rolfe H. Herber Israel Nowik 《Phosphorus, sulfur, and silicon and the related elements》2013,188(6):1336-1340
Abstract Temperature-dependent Mössbauer effect spectroscopy has been used to elucidate the dynamics of the metal atom in a number of tin organometallics. The vibrational amplitudes so obtained have been compared to those extracted from single crystal X-ray diffraction data, and the differences between these two sets are rationalized. GRAPHICAL ABSTRACT 相似文献
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Sheng-Qin Chen Fei Ding Fang-Ming Liu 《Phosphorus, sulfur, and silicon and the related elements》2013,188(3):574-581
Abstract Novel ring opening compounds, (Z)-2-((Z)-((E)-1,3-diaryl-2-(1H-1,2,4-triazol-1-yl)allylidene)amino)aryl N-hydroxybenzimidothioates 4a–r, were obtained from the reaction of 2,4-diaryl-3-(1H-1,2,4-triazol-1-yl)-2,5-dihydro-1,5-benzothiazepines 3a–f and arylonitrile oxides. The structure of these products has been elucidated by spectroscopic analysis and, in one case, X-ray crystallographic analysis. According to the result, it was presumed that this reaction did not proceeded through 1,3-dipolar cycloaddition reaction. Supplemental materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements to view the free supplemental file. GRAPHICAL ABSTRACT 相似文献