1,2-二（二苯基膦）乙烷氯化钯(II)的合成及催化活性

以卤化钯（X=Cl、 Br、 I）为原料,乙腈为溶剂,与1,2-二（二苯基膦）乙烷反应,合成了1,2-二（二苯基膦）乙烷卤化钯[Pd(dppe)X₂, dppe=1,2-二（二苯基膦）乙烷],产率均高于96％,其结构经¹H NMR, XRD和元素分析确证。以Suzuki反应和Stille C—C偶联反应为模板反应,研究了Pd(dppe)Cl₂的催化活性。结果表明：Pd(dppe)Cl₂对2-氯噻吩和对甲氧基苯硼酸的Suzuki偶联反应、4,7-二氯苯并噻二唑核或其他含苯并噻二唑核的卤代芳烃与其他芳香核的锡试剂的Stille C—C偶联反应的催化转化率分别为80%~85%和52%~60%,催化活性优于四（三苯基膦）钯(70%~85%和43%~50%)。     

Complexation Properties and Synthesis of 1,2-Bis(2,2'-bipyridinyl)ethylene and 1,2-Bis(2,2' -bipyridinyl)ethane Ligands with Cu(I)

l,2-Bis(2,2'-bipyridinyl)ethylene(1) ligand was synthesized by Wittig-Horner reaction and 1, 2-Bis(2, 2'-bipyridinyl)ethane(2) ligand(which can be obtained via another route ) was prepared by hydrogenation of (1). The formation of complexes of (1) and (2) with copper (I) has been studied. The influence of the different bridge chains (CH =CH, CH2CH2) on complexation is discussed on the basis of 1H NMR spectra. Keywords Dipyridine aldehyde, Dipyridine derivative, Copper complex     

Efficient Synthesis of 1,2-Bis(2,2′-bipyridinyl)ethane and 1,2-bis(1,10-phenanthrolinyl)ethane ligands by oxidative coupling of the corresponding monomeric methylene carbanions

Several dimeric 1,2-bis (2,2′-bipyridinyl)ethane (1,2,6,7, and 9 and 1,2-bis(1,10-phenanthrolinyl)) ethane (3,4, and 5) ligands have been synthesized in high yield by oxidative coupling of the corresponding monomeric methylene carbanions using as oxidating agents Br₂, I₂, and 1,2-dibromoethane. The structure of the compounds obtained from three tetramethyl-2,2′-bipyridines and one tetramethyl-1,10-phenanthroline have been assigned on the basis of their ¹H-NMR spectra. The electronic absorption and emission properties of these new ligands are reported. They display intense fluorescence spectra.     

meso-1,2-Bis­(methyl­azo)-1,2-di­phenyl­ethane

The title compound, meso-1,2-bis­(methyl­diazenyl)-1,2-di­phenyl­ethane, C₁₆H₁₈N₄, is arranged in a disordered manner around an inversion point. The N—N atom distances in the azo group of 1.192 (8) and 1.195 (8) Å, and the C—C atom distances in the ethyl­ene moiety at 1.512 (8) and 1.503 (8) Å in the two models [refined to 51.7 (6) and 48.3 (6)% occupancies] were not significantly different.     

Coordination Compounds of Silver Methanesulfonate with Triphenylphosphine and 1,2-Bis(4-Pyridyl)ethane

The reaction of Ag(CH₃SO₃) with PPh₃ gave the compound [Ag(CH₃SO₃)(PPh₃)₂] (I) and the reaction of Ag(CH₃SO₃) with PPh₃ and 1,2-bis(4-pyridyl)ethane (Dpe) affords the mixed complex [Ag(CH₃SO₃)(PPh₃)(Dpe)] (II). The crystal structures of I and II were determined by X-ray diffraction (CIF file CCDC no. 1563357 (for I)). In I, the centrosymmetric binuclear complex [Ag(CH₃SO₃)-(PPh₃)₂]₂ is formed. The Ag atom has a distorted tetrahedral coordination composed of two bidentate bridging O atoms of the sulfonate anion and two P atoms of two PPh₃ ligands. The structure of II is based on the centrosymmetric binuclear molecule with two bridging Dpe ligands between two [Ag(CH₃SO₃)(PPh₃)] complexes. The O atoms of the methanesulfonate ion are statistically disordered, which induces a considerable distortion of the silver polyhedron with C.N. 5. Both compounds tend to emit in the blue and green regions of the PL spectra.     

Crosslinking of styrene–butadiene rubber with 1,2-bis(benzocyclobutenyl)ethane

1,2-Bis(benzocyclobutenyl)ethane (BBCB) was used as a thermally activated crosslinking agent in styrene–butadiene rubber (SBR), both in the raw and carbon black-filled materials. Diels–Alder crosslinking reactions occurred to a significant degree, despite the lack of substituents of opposing electronic effects. The reaction is free of toxic crosslinking promoters and evolved by-products. Various physical properties such as ultimate elongation, tensile strength, and modulus were measured and compared to those properties of a sulfur-cured sample of SBR. Linear relationships were found between the amount of BBCB present and the modulus of the materials, as well as the amount of BBCB and solvent uptake in swell tests. © 1993 John Wiley & Sons, Inc.     

One Dimensional Coordination Polymer Constructed by 1,2-Bis(4-pyridinecarboxamido)ethane and Copper(II)

IntroductionInrecentyears ,thesynthesisandcharacterizationofco ordinationpolymershavebeenrapidlyexpandingowingtoafundamentalinterestintheirfascinatingstructuraldiversityandpotentialapplicationsasfunctionalmaterials .1 4 Thesyn thesisofcoordinationpolymerswith 4 ,4′ bipyridine (4 ,4′ bipy)orrelatedspeciesasbifunctionalligandandmetalionhasgeneratedaconsiderablenumberofnoveltopologicalframeworks ,suchasT shaped ,5ladder,6 brickwall,7squareorrectangulargrid8,9andotheruncommonmotifs .Herewereport…     

1,2-二(2-胺基苯氧基)乙烷银配合物的合成与晶体结构

本文采用配体1, 2-二(邻氨基苯氧基)乙烷(L)分别与AgPF6, AgCF3SO3, AgNO3和AgSbF6 进行配位反应,依次得到了四个配合物1 [Ag2(L)2(PF6)]、2 [Ag2(L)2(CF3SO3)2]、3 [Ag(L)NO3]n 和4 [Ag(L)2SbF6]n,并通过FTIR、元素分析、以及X射线单晶衍射等对配合物的结构与组成进行了表征。单晶衍射结果表明,配合物1和2为双核银(I)配合物,3和4为银(I)的配位聚合物。配合物1具有穴状结构,2经Ag?Ag键桥连两个配体形成扭曲的非平面结构。聚合物3的结构为一维(1D)“之”字链,4具有三维(3D)多孔的结构框架。在四个配合物结构中,相应的抗衡阴离子均未参与Ag(I)进行配位作用。