共查询到19条相似文献,搜索用时 288 毫秒
1.
2.
3.
4.
5.
氮杂环丙烷类化合物是重要的有机合成子,其广泛存在于各种有机合成反应当中.因其独特的三元环结构,致使其具有较大的环张力.通常氮杂环丙烷类化合物可以与各种亲核试剂反应,合成各种传统方法难以合成的β-位取代的胺类化合物,其中包括氨基醇、氨基醚以及二胺类化合物.通过亲核试剂开氮杂环丙烷的反应研究已经相当成熟,此处不再赘述.此外,过渡金属催化的C—N活化是一类重要的合成方法.作为C—N活化重要底物,过渡金属催化氮杂环丙烷的开环偶联反应取得长足的发展.尤其是近十年来,镍催化氮杂环丙烷的开环偶联反应不断涌现.基于此,综述了镍催化在氮杂环丙烷开环偶联反应中的研究进展和设计原则,重点介绍氮杂环丙烷的开环原理,对比不同取代的氮杂环丙烷区域选择性,总结不同催化模式下的共性.本综述将从以下三个方面介绍氮杂环丙烷的开环偶联反应:其一是单独的镍催化模式;其二是光/镍协同共催化模式;其三则是电化学促进的镍催化模式.对于氮杂环丙烷的开环模式则可以分为:镍催化的SN2型亲核开环模式、卤素离子亲核开环模式以及电化学还原模式. 相似文献
6.
7.
在自制的直链淀粉-三(3,5-二甲基苯基氨基甲酸酯)(ADMPC)手性固定相上,对2种氮杂环丙烷对映体进行了手性拆分研究.系统选用了不同种类及不同含量的醇改性剂,详细考察了样品的保留时间和立体选择性. 相似文献
8.
9.
10.
以十五元三烯氮杂大环改性的不同代数聚丙烯亚胺树状聚合物(Gn-M,n=2,3,4)为模板,通过共络合-还原方法制备了一系列钌/铑双金属纳米粒子[Gn-M(RuxRh100-x)DTNs,x为Ru摩尔分数],并将其应用于丁腈橡胶(NMR)的催化氢化.用紫外-可见光谱(UV-Vis)、X射线衍射分析(XRD)及X射线能谱(EDS)表征DTNs的金属组成和结构,结果表明,DTNs上的双金属离子被还原成金属单质并负载于Gn-M上;粒度分析结果表明,G2-M(Ru50Rh50),G3-M(Ru50Rh50)和G4-M(Ru50Rh50)DTNs的平均粒径分别为7.5,8.1和4.5 nm.凝胶测试及核磁共振波谱(1H NMR)结果表明,Ru/Rh DTNs催化剂对丁腈橡胶的催化氢化反应具有良好的选择性.当以G4-M(Ru30Rh70)DTNs为催化剂时,NBR的氢化度最高可达99.51%,循环使用2次后,丁腈橡胶的氢化度仍可达到90.58%. 相似文献
11.
Diketocarbene generated by rhodium(II) acetate-catalyzed decomposition of diazodimedone reacts with benzene at room temperature to give 5,5-dimetlryl-2-phenylcyclohexane-1,3-dione in 88% yield.Translated from Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 491–493, February, 1996 相似文献
12.
13.
Jing Yan Yan-Bing Wang Senyao Hou Linlin Shi Xinju Zhu Xin-Qi Hao Mao-Ping Song 《应用有机金属化学》2020,34(12):e5954
An efficient NCC pincer Ni (II)-catalyzed hydrophosphination of nitroalkenes with diphenylphosphine has been developed. Under the optimized conditions, both (hetero)aromatic and aliphatic nitroalkenes were well tolerated, irrespective of electronic effect, to provide the corresponding products in up to 99% yield. 相似文献
14.
R. Hernández-Molina I. Kalinina P. Esparza M. Sokolov J. Gonzalez-Platas A. Estévez-Braun E. Pérez-Sacau 《Polyhedron》2007
Complexes of naturally occurring hydroxynaphtho-quinone, lapachol (2-hydroxy-3(3-methyl-2-buthenyl)-1,4-naphthoquinone = HL) with Co(II), Ni(II) and Cu(II) have been prepared by reaction of the corresponding acetates with the ligand (HL) in ethanol. The molecular and crystal structures were determined for [CoL2(EtOH)2] (1), [NiL2(EtOH)2] (2), and [CuL2(py)2] (3). In all cases the deprotonated lapachol behaves as chelating bidentate ligand. The complexes were also characterized by elemental analyses, cyclic voltammetry, and FAB-MS. 相似文献
15.
《Journal of Coordination Chemistry》2012,65(11):1165-1171
Reactions of 3,6-bis(2′-pyridyl)pyridazine derivatives (n-dppn)¶ with MX2(PhCN)2 (M?=?Pd, Pt; X?=?Cl,?Br) have been investigated. The new complexes cis-[PdCl2(n-dppn)] (n?=?5,?6,?8,?12), cis-[PtCl2(n-dppn)]?·?H2O (n?=?5,?6), cis-[PtCl2(8-dppn)] and cis-[PtBr2(5-dppn)] have been characterized by elemental analyses, conductivity measurements, infrared, electronic and 1H-NMR spectra. 相似文献
16.
G. Muthusamy P. Viswanathamurthi M. Muthukumar K. Natarajan 《Phosphorus, sulfur, and silicon and the related elements》2013,188(8):2115-2124
Several new hexa-coordinated ruthenium(II) and penta-coordinated rhodium(I) complexes of the types [RuCl(CO)(PPh 3 ) 2 (TSC)], [RuH(CO)(PPh 3 ) 2 (TSC)], and [Rh(PPh 3 ) 3 (TSC)] (where TSC = anion of thiosemicarbazone Schiff bases) have been prepared by the reactions of [RuHCl(CO)(PPh 3 ) 3 ], [RuH 2 (CO)(PPh 3 ) 3 )], and [RhH(PPh 3 ) 4 ] with thiosemicarbazones of 2-furaldehyde (H-FTSC), thiophene-2-carboxaldehyde (H-TCTSC), p-anisaldehyde (H-ATSC), piperonaldehyde (H-PTSC), and cyclohexanone (H-CTSC). All the new complexes obtained have been characterized on the basis of elemental analysis, IR, 1 H NMR, 31 P NMR, and electronic spectral data. 相似文献
17.
W. J. Surga M. Z. Wisniewski A. G. Adach 《Journal of Thermal Analysis and Calorimetry》1995,44(3):697-705
Complexes of 2-mercapto-1-methylimidazole (TMZ) with PdII and PtII of the general formula M(TMZ)nX2 (whereM=Pd, Pt andX=Cl, Br, I or SO4 andn=2 or 4) were obtained. The thermal stabilities of the compounds were estimated by derivatographic measurements and lattice constants were estimated from their X-ray powder diffraction patterns. 相似文献
18.
Tamara R. Todorović Alessia Bacchi Nenad O. Juranić Dušan M. Sladić Giancarlo Pelizzi Tatjana T. Božić Nenad R. Filipović Katarina K. Anđelković 《Polyhedron》2007
New complexes of Cd(II), Zn(II) and Ni(II) with 2-quinolinecarboxaldehyde selenosemicarbazone (Hqasesc) were synthesized and structurally characterized. The structure of the ligand, Cd(II) and Zn(II) complexes was determined by NMR and IR spectroscopy, elemental microanalysis and molar conductivity measurements. Both complexes occur in solution in two forms, the major tetrahedral and minor octahedral. In the major Cd(II) complex one qasesc− ligand is coordinated as a tridentate, the fourth coordination site being occupied by acetate, while in the major Zn(II) complex two qasesc− ligands are coordinated as bidentates. In both minor complexes two qasesc− ligands are coordinated as tridentates forming the octahedral geometry around the central metal ion. The only paramagnetic complex in the series is Ni(II) complex for which X-ray structure analysis was performed. The complex has the angularly distorted octahedral geometry with two qasesc− ligands coordinated as tridentates, in a similar way as in the minor complexes of Cd(II) and Zn(II). 相似文献
19.
《Journal of Coordination Chemistry》2012,65(7):1067-1075
Three new mononuclear complexes [Co(2-Acpy)2(H2O)2](NO3)2 (1), [Ni(2-Acpy)2(H2O)2](NO3)2 (2) and [Cd(2-Acpy)2(NO3)2] (3) (2-Acpy = 2-acetylpyridine) have been synthesized and characterized by elemental analysis, IR and UV–Vis spectroscopy. The structures of 1 and 3 were accomplished by single crystal X-ray diffraction. Crystallographic investigation of 1 reveals monomeric, dicationic units in which the cobalt(II) ion is six-coordinate. The coordination sphere is formed by two N, O bidentate acetylpyridine ligands and two water molecules. The crystal structure of 3 consists of monomeric units in which the cadmium is eight-coordinate. Both the organic ligand and nitrate groups are bidentate chelators. The supramolecular solid-state architecture is sustained by π–π interactions. 相似文献