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Two Cobalt(II) Complexes Derived from the Hydrolysis Product of Di-Schiff Base Ligand N,N'-Bis-(1-benzimidazo-2-yl-ethylidene)-ethane-1,2-diamine:Preparation,Characterization and Crystal Structure of the 6-Coordinate Species [CoL_2]X·H_2O (X = ClO_4^-, N 被引量:1
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作者 夏昌坤 吴小园 +2 位作者 吴鼎铭 蒋晓瑜 卢灿忠 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 北大核心 2008年第7期805-811,共7页
The reactions of Co(C1O4)2·6H2O and Co(NO3)2.6H2O with the di-Schiff base ligand N,N'-bis-(1-benzimidazo-2-yl-ethylidene)-ethane-1,2-diamine (LA) in ethanol have been investigated. The reactions of LA wi... The reactions of Co(C1O4)2·6H2O and Co(NO3)2.6H2O with the di-Schiff base ligand N,N'-bis-(1-benzimidazo-2-yl-ethylidene)-ethane-1,2-diamine (LA) in ethanol have been investigated. The reactions of LA with excess amount of cobalt salts yield the six-coordinate complexes [CoL2](ClO4)E·H2O 1 and [CoL2](NO3)E·H2O 2 as isolatable products (L= N-(1- benzimidazo-2-yl-ethylidene)-ethane-1,2-diamine), where L is a tri-dentate mono-Schiff base ligand, resulting from the hydrolysis of the precursor di-Schiff base LA. Both complexes were characterized by X-ray crystallography. Crystal data for complex 1: monoclinic, space group P21/c, a = 11.9214(10), b = 23.5828(17), c = 14.0387(12)A, β = 135.219(4)°, C22H30Cl2CoN8O9, Mr = 680.37, V = 2780.1(4) A^3 ,Z = 4, Dc = 1.625 g/cm^3,μ(MoKa) = 0.876 mm^-1, F(000) = 1404, the final R = 0.0725 and wR = 0.1530 for 5726 observed reflections (I 〉 2σ(I)). Crystal data for complex 2: monoclinic, space group P21/c, a = 18.2162(16), b = 10.0610(6), c = 18.593(2)A, β = 130.099(3)°, C22H30CoN10O7, Mr = 605.49, V = 2606.5(4) A3 Z = 4, Dc = 1.543 g/cm^3,μ(MoKa) = 0.722 mm^-1, F(000) = 1260, the final R = 0.0619 and wR = 0.1429 for 5194 observed reflections (I 〉 2σ(I)). X-ray diffraction analysis reveals that each cobalt atom in the two complexes is chelated by six nitrogen atoms from two tridentate iigands L, exhibiting a slightly distorted octahedral coordination sphere. In both complexes, the strong hydrogen-bonding interactions between the lattice waters and N-H groups of the ligands result in 1D chains which are further connected by ClO4^- (or NO3^-) groups to form a 3D framework. In complex 2, the strong π-π interactions increase the stability of the structure. 展开更多
关键词 2-acetylbenzimidazole di-Schiff base ligand crystal structure hydrolysis hydrogen-bonding interactions coordination complex N N -bis-(1-benzimidazo-2-yl-ethylidene)-ethane- 1 2-diamine N-(1-benzimidazo-2-yl-ethylidene)-ethane- 1 2-diamine
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Kinetic Resolution of 1,2-Diamines via Organocatalyzed Asymmetric Electrophilic Aminations of Anilines 被引量:2
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作者 Jinglei Xie Zheng Guo +3 位作者 Wei Liu Dekun Zhang Yu-Peng He Xiaoyu Yang 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2022年第14期1674-1680,共7页
An efficient kinetic resolution(KR)protocol for 1,2-diamines has been developed through asymmetric electrophilic aminations of anilines enabled by chiral phosphoric acid catalysis.A wide array of substituted 1,2-diami... An efficient kinetic resolution(KR)protocol for 1,2-diamines has been developed through asymmetric electrophilic aminations of anilines enabled by chiral phosphoric acid catalysis.A wide array of substituted 1,2-diamines were compatible with this method,generating both the recovered staring materials and the amination products with high enantioselectivities(with s-factor up to 218).Notably,this method is amenable to the kinetic resolution of 1,2-diamines bearingα-tertiary amine moieties,which represents the first KR of this type of 1,2-diamines.Facile removal of the introduced hydrazine group and oxidative cleavage of the N-aryl group to release the free primary amine demonstrate the value of this method. 展开更多
关键词 Asymmetric catalysis 1 2-diamines Kinetic resolution Chiral phosphoric acids AMINATION
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Keggin type heteropolyacids-catalyzed synthesis of quinoxaline derivatives in water 被引量:4
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作者 Tai Kun Huang Lin Shi Rui Wang Xing Zhou Guo Xiao Xia Lu 《Chinese Chemical Letters》 SCIE CAS CSCD 2009年第2期161-164,共4页
Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in exc... Keggin type heteropolyacids was found to be an efficient and reusable catalyst for the synthesis of biologically active quinoxaline derivatives from the condensation of 1,2-diamine with 1,2-dicarbonyl compounds in excellent yields in water. This method provides a new and efficient protocol in terms of small quantity of catalyst, a wide scope of substrates, and simple work-up procedure. 展开更多
关键词 Keggin type heteropolyacids 1 2-diamines 1 2-Diketones Quinoxaline derivatives WATER
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An Efficient Solid Acid Promoted Synthesis of Quinoxaline Derivatives at Room Temperature
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作者 AHMAD, Shaabani ALI, Maleki 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2007年第6期818-821,共4页
Quinoxaline derivatives have been synthesized in a very short time with excellent yields by the condensation of 1,2-diamines with aliphatic or aromatic 1,2-dicarbonyl compounds or benzilmonoxime in the presence of sil... Quinoxaline derivatives have been synthesized in a very short time with excellent yields by the condensation of 1,2-diamines with aliphatic or aromatic 1,2-dicarbonyl compounds or benzilmonoxime in the presence of silica sulfuric acid as a very inexpensive solid acid catalyst at room temperature. The recovery and reuse of the catalyst are also satisfactory. 展开更多
关键词 silica sulfuric acid QUINOXALINE 1 2-diketone 1 2-diamine benzilmonoxime
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An Efficient and Convenient Synthesis of Imidazolines and Benzimidazoles via Oxidation of Carbon-Nitrogen Bond in Water Media
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作者 Shaikh,Kabeer A. Patil,Vishal A. Shaikh,Parveen A. 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2012年第4期924-928,共5页
The metal coordination complex K4[Fe(CN)6] is an efficient and environmentally benign catalyst for the syn- thesis of imidazolines and benzimidazoles from various aldehydes and 1,2-diamines in aqueous medium at room... The metal coordination complex K4[Fe(CN)6] is an efficient and environmentally benign catalyst for the syn- thesis of imidazolines and benzimidazoles from various aldehydes and 1,2-diamines in aqueous medium at room temperature. This protocol gives excellent yield of product with desired purity. 展开更多
关键词 ALDEHYDE 1 2-diamines Ka[Fe(CN)6] IMIDAZOLINES BENZIMIDAZOLES water
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