Dicopper(II) Metallacyclophanes with Oligo(<i>p</i>-phenylene-ethynylene) Spacers: Experimental Foundations and Theoretical Predictions on Potential Molecular Magnetic Wires
作者:María Castellano、Francisco R. Fortea-Pérez、Abdeslem Bentama、Salah-Eddine Stiriba、Miguel Julve、Francesc Lloret、Giovanni De Munno、Donatella Armentano、Yangling Li、Rafael Ruiz-García、Joan Cano
DOI:10.1021/ic400754m
日期:2013.7.1
−JS1·S2 with S1 = S2 = SCu = 1/2]. Density functional calculations on the BS singlet (S = 0) and triplet (S = 1) spin states of the model complexes 1 and 2 with an ideal orthogonal molecular geometry (ψ = 0° and ϕ = 90°) support the occurrence of a spin polarization mechanism for the propagation of the exchange interaction between the two unpaired electrons occupying the dxy orbital of each square planar
Linking metal centres with diimido ligands: synthesis, electronic and molecular structure and electrochemistry of organometallic ditungsten complexes [{WCl2(Ph2PMe)2(CO)}2(N–X–N)] (X = π-conjugated organic)
作者:Graeme Hogarth、David G. Humphrey、Nikolas Kaltsoyannis、Woo-Sung Kim、Mo-yin (Venus) Lee、Tim Norman、Simon P. Redmond
DOI:10.1039/a904001c
日期:——
Tungsten(IV) diimido-bridged complexes [WCl2(Ph2PMe)2(CO)}2(µ-N–X–N)] have been prepared via oxidativeaddition of diisocyanates to two equivalents of [WCl2(Ph2PMe)4]. para-Substituted monoimido complexes [WCl2(Ph2PMe)2(CO)(NC6H4X-p)] (X = I, Br or CCPh) have also been prepared but attempts to couple the X = I complex as a route to diimido-bridged complexes were unsuccessful. All complexes are air-stable
通过将二异氰酸酯氧化加成到两当量的[WCl 2(Ph )中,制备了钨(IV)二亚胺基桥接的络合物[WCl 2(Ph 2 PMe)2(CO)} 2(µ-N–X–N)。2 PMe)4 ]。对位取代的单亚氨基配合物[WCl 2(Ph 2 PMe)2(CO)(NC 6 H 4 X- p)](X = I,Br或C也已经制备了CPh),但是尝试将X = I络合物偶联为通往二亚氨基桥连络合物的途径失败。所有络合物均为空气稳定的结晶固体和五个二亚氨基(N–X–N = p -NC 6 H 4 N,p -N- o -MeC 6 H 3 N,p -N(o -MeOC 6 H 3 C 6 H 3 OMe- o)N,1,5-NC 10 H 6 N或m -NC 6 H 4N)和一种单亚胺基络合物(X = I)在晶体学上已得到表征。全部显示出相同的总体结构特征,即膦和顺式氯化物的反式排列。中心芳基环通常大致位于Cl
Synthesis of Structurally Diverse Emissive Molecular Rotors with Four-Component Ugi Stators
作者:Ma. Carmen García-González、Andrés Aguilar-Granda、Angel Zamudio-Medina、Luis D. Miranda、Braulio Rodríguez-Molina
DOI:10.1021/acs.joc.7b02858
日期:2018.3.2
of the multicomponentUgireaction to rapidly prepare a library of dumbbell-like molecular rotors is highlighted here. The synthetic strategy consisted of the atom-economic access to 15 bulky and structurallydiverse iodinated stators, which were cross-coupled to the 1,4-diethynylphenylene rotator. From those experiments, up to six rotors 1a–c and 1l–n were obtained, with yields ranging from 35 to 69%
Polyacetylinic oligomers suitable for high-temperature polymer-matrix composites are provided. The polyacetylinic oligomers have the formula:
D-A-D
wherein
D is an endcap including at least one crosslinking functionality; and
A is backbone selected from the group consisting of imidesulfone; ether; ethersulfone; amide; imide; ester; estersulfone; etherimide; amideimide; oxazole; oxazole sulfone; thiazole; thiazole sulfone; imidazole; and imidazole sulfone. At least one ethynyl functional group, however, is incorporated into the backbone such that crosslinking is not only realized at the endcaps but also at the ethynyl groups within the backbone of the oligomer itself.
Synthesis of functionalized alkynes via palladium-catalyzed Sonogashira reactions
作者:Mansur B. Ibrahim、Bassam El Ali、Imran Malik、Mohammed Fettouhi
DOI:10.1016/j.tetlet.2015.12.086
日期:2016.2
A highly efficient protocol for the copper and phosphine free Sonogashira cross-coupling reactions of aryl iodides with terminal alkynes under aerobic conditions has been developed. Using 1 mol % of the palladium-bis(oxazoline) complex, Pd-BOX A, in the presence of KOH, and a CH3CN-H2O solvent system allowed for the cross -coupling reactions to proceed at room temperature or 60 degrees C. This new catalytic system was found to be highly active for the cross-coupling reaction of aryl diiodo substrates with unactivated alkyl alkynes to produce various symmetrical dialkynes, as well as for the cross -coupling of terminal dialkynes with aryl iodides to generate symmetrical disubstituted internal alkynes. (C) 2015 Elsevier Ltd. All rights reserved.