共查询到20条相似文献,搜索用时 515 毫秒
1.
L. Sommer 《Analytical and bioanalytical chemistry》1964,202(5):359-360
2.
Jackson M. Chitanda J. Wilson Quail Stephen R. Foley 《Journal of organometallic chemistry》2009,694(9-10):1542-1548
Reaction of acetato-bridged dinuclear palladacycles, [Pd(iminoisoindoline)(μ-OAc)]2, with stoichiometric amounts of PR3 (where R = Ph or Cy) resulted in formation of the corresponding mononuclear phosphine-ligated, six-membered palladacycles with the general formula [Pd(iminoisoindoline)(OAc)PR3]. The analogous chloride complexes were synthesized by reaction of [Pd(iminoisoindoline)(μ-OAc)]2 with LiCl in acetone followed by addition of phosphine to afford the monomeric derivatives [Pd(iminoisoindoline)(Cl)PR3]. Representative crystal structures of both types of mononuclear palladacycles confirmed the mononuclear nature of the complexes and showed a trans-arrangement of the phosphine ligand to the heterocyclic imine-nitrogen of the palladacycles. 相似文献
3.
An aminophenol ligand, N,N,N'-tri(2-hydroxy-5-methylbenzyl)-l,2-ethanediamine, was prepared through the Marmich reaction, and structurally characterized by NMR, IR, MS and single-crystal X-ray diffract... 相似文献
4.
Summary
N,N,N,N-Tetramethylisophthalthioamide (Hmpt) was cyclopalladated with PdCl2 in hot dimethylsulphoxide to give [PdCl(mpt)]. The structure was determined by X-ray analysis. The thioamide is metallated at C(2) to act as an S528-01C528-02S tridentate anionic ligand. There is appreciable steric repulsion between the benzene ring H(4, 6) and the dimethylamino groups. The hydrogens and the methyl groups mutually deviate from the coordination plane in opposite directions. The stability of the fused 5,5-membered chelate ring formed by the S528-03C528-04S ligand seems to overcome the steric hindrance. Derivatives were prepared by replacement of the chloride ion with iodide, diethyldithiocarbamate, 4-tert-butylpyridine, or tri-n-butylphosphine, and characterized spectroscopically. The S528-05C528-06S-fused chelate ring was maintained in these derivatives. 相似文献
5.
《Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy》1989,45(2):187-201
The ground state and protonated state (quaternized salt) vibrational spectra (200–1800 cm−1) of the title amines are reported for various ring and/or methyl deuterated derivatives. Complete assignments are proposed and compared to those established for the parent hydrocarbons, benzene and biphenyl, and for the parent primary amines, aniline, p-phenylenediamine and benzidine. The electronic distribution, N(n)→ring(π) charge-transfer character and inductive effects are characterized from a vibrational point of view. Finally changes in the vibrational and electronic conformation upon protonation of the nitrogen atom are discussed. These results provide a fundamental basis for the vibrational investigation of excited states and reactive transients of aromatic amines. 相似文献
6.
É. E. Korshin L. G. Zakharova Ya. A. Levin L. Kh. Ashrafullina E. A. Podval'nyi Yu. Ya. Efremov 《Russian Chemical Bulletin》1992,41(11):2082-2090
Triaryl-substituted -aminoamidines were obtained by the reaction of ,-unsaturated N-arylimidoyl chlorides with arylamines. Acylation of the products gave the products from monosubstitution at the -amino group. Triaryl-substituted -aminoamidines react with phosgene and with oxalyl chloride to form 4-aryliminoperhydropyrimidin-2-ones and 5-aryliminoperhydro-1,4-diazepine-2,3-diones, respectively.For previous communication, see [1].A. E. Arbuzov Institute of Organic and Physical Chemistry, Kazan' Scientific Center, Russian Academy of Sciences, 420083 Kazan'. Translated fromIzvestiya Akademii Nauk, Seriya Khimicheskaya, No. 11, pp. 2633–2642, November, 1992. 相似文献
8.
在四氢呋喃中合成了Schiff碱配体N,N'-二(2-羟基苄烯)-2-羟基苯甲基二胺(SB)与二阶过渡金属镍、铜、锌的三核或双核配合物;用钠汞齐还原SB得到了其氢化物N,N'-二(2-羟基苄基)-2-羟基苯甲基二胺(HSB),并在乙醇中合成了经与铜的双核配合物。对这些配合物进行了元素分析和热分析,并测定了电导、红外光谱和紫外光谱,确定了分子式,讨论了可能的配位结构。 相似文献
9.
Hongsheng Lu Youlin Ma Baogang Wang Zhiyu Huang 《Journal of Dispersion Science and Technology》2017,38(11):1618-1624
Here, we report a CO2 stimulus-responsive system with anionic surfactant sodium oleate (NaOA) and N, N, N′, N′, N″-Pentamethyldipropylenetriamine (PMDPTA). The microstructure transition from spherical micelles to worm-like micelles was confirmed by rheology measurements, dynamic light scattering (DLS), and cryogenic transmission electron microscopy (Cyro-TEM). There were three types of CO2?responsive groups in PMDPTA. However, because of PMDPTA ionization degrees, just one responsive group of PMDPTA could be ionized by CO2 to work with OA?, resulting in structure transformation from spherical micelles to worm-like micelles. Besides, this system could be switchable between low-viscosity fluid and high viscoelastic by CO2/N2. 相似文献
10.
Dianne D. Ellis Anthony L. Spek 《Acta Crystallographica. Section C, Structural Chemistry》2001,57(2):147-148
The title complex, [V(C7H7N)(C13H23N2Si2)2Cl], consists of a V metal centre coordinated to five N atoms and a Cl− ion in a pseudo-octahedral arrangement. The N atoms of the benzamidinate ligands form two four-membered chelate rings to V, with bite angles of 63.59 (8) and 64.36 (8)°, whilst the fifth N atom is from a p-tolylimido ligand [V—N—C 172.2 (2)°] located cis with respect to the Cl− ion [Cl—V—Nimido 96.96 (8)°]. 相似文献
11.
Samus' N. M. Strelkov E. A. Tsapkov V. I. Gulya A. P. 《Russian Journal of Coordination Chemistry》2004,30(4):275-279
Complexes of lanthanides with N,N-bis(2-hydroxybenzylidene)-2-hydroxyphenylmethanediamine (H3L) were synthesized and investigated by the elemental, IR, magnetochemical, and thermogravimetric methods. Using the data obtained, they were found to have compositions Ln2L2 · nH2O and La2L2 · MCl2 · 4H2O (Ln = La3+, Pr3+, Nd3+, Dy3+, Er3+; M = Cu2+, Co2+, Ni2+; n = 4, 6). Suggestions on their structures were made. In the interval of 20–140°C, these complexes were shown to be high-resistance semiconductors. 相似文献
12.
A. Ya. Strakov M. V. Petrova A. I. Gurkovskii O. Ya. Neiland 《Chemistry of Heterocyclic Compounds》1999,35(3):286-289
Reaction of 2-formyldimedone and 2-formyl-1,3-indanedione with 1,1-di(2-hydroxyethylamino)- and 1,1-di(4-morpholyl)-2-nitroethylenes produces 2-[3,3-di(2-hydroxyethylamino)-2-nitroprop-2-en-1-ylidene]- and 2-[3,3-di(4-morpholyl)-2-nitroprop-2-en-1-ylidene]-5,5-dimethyl-1,3-cyclohexanediones and the 1,3-indanediones, respectively. The reaction of the same 2-formyl-1,3-cyclanediones with 2-nitromethyleneimidazolidine yields 8,8-dimethyl-4-nitro-6-oxo-1,2,3,6,7,8-hexahydroimidazo[1,2-a]quinoline and 4-nitro-6-oxo-1,2-dihydro-6H-imidazo[1,2-c]-4-azafluorene.Riga Technical University, Riga LV-1658, Latvia; e-mail: marina@osi.lanet.lv. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 330–333, March, 1999. 相似文献
13.
14.
A simple, rapid, and efficient procedure for formylation of primary and secondary amines and alcohols using ethyl formate catalyzed with poly(N,N′-dichloro-N-ethyl-benzene-1,3-disulfonamide (PCBS), N,N,N′,N′-tetrachlorobenzene-1,3-disulfonamide (TCBDA), poly(N,N′-dibromo-N-ethyl-benzene-1,3-disulfonamide (PBBS) and also N,N,N′,N′-tetrabromobenzene-1,3-disulfonamide (TBBDA) was adopted. The reactions were performed under microwave irradiation with high yields. 相似文献
15.
16.
17.
《Tetrahedron: Asymmetry》2000,11(23):4709-4717
A new and general one-pot synthetic method for C2-symmetric N,N′-aryl-disubstituted bis(oxazolidin-2-ones) has been developed. Highly regioselective intramolecular cyclization reactions of 2,3-di(methanesulfonyloxy)-1,4-dihydroxybutane with arylisocyanates in the presence of sodium hydride afforded the corresponding C2-symmetric N,N′-aryl-disubstituted bis(oxazolidin-2-ones) in 82–92% yields. Hydrolytic ring opening of the bis(oxazolidin-2-ones) provided a convenient synthetic route for optically pure C2-symmetric N,N′-aryl-disubstituted 2,3-diamino-1,4-butanediols (58–86% yields). 相似文献
18.
19.
20.
Prem Singh Dhami C. Janardanan Poonam Jagasia S. Pahan S. C. Tripathi P. M. Gandhi P. K. Wattal 《Journal of Radioanalytical and Nuclear Chemistry》2013,296(3):1341-1347
This paper describes a method for the separation and purification of 90Sr from PUREX–HLLW employing solvent extraction and precipitation techniques. 30 % TBP in n-dodecane was used for the removal of residual uranium, plutonium and neptunium from HLLW. Trivalent actinides and lanthanides were subsequently removed using N,N,N’,N’-tetra(2-ethylhexyl) diglycolamide (TEHDGA, 0.20 M in 30 % isodecyl alcohol and n-dodecane). 90Sr was selectively extracted from actinides and lanthanides depleted HLLW using 0.3 M TEHDGA in 5 % isodecyl alcohol and dodecane. Loaded strontium was stripped using 0.01 M HNO3 and further purified by radiochemical precipitation technique after adding Fe and natural strontium as carriers. Based on the experimental results, a flow-sheet was formulated and mCi levels of 90Sr recovered. 相似文献