Phenoxy-Linked Mesoionic Triazol-5-ylidenes as Platforms for Multinuclear Transition Metal Complexes
摘要:
The preparation and full characterization of a variety of mono- ([L1-H]), di- ([L2-H-2], [L2A-H2]), and tri-([L3-H-3]) 1,2,3-triazolium salts constructed form "clicked" hydroxybenzene derivatives are reported. Deprotonation with potassium hexamethyldisilazide, followed by in situ metalation, allowed for the synthesis of a series of mono- (Li.[M]), di(L2.[M](2), L2.[M](2)), and trinuclear (L3.[M](3)) group 9-11 (M = [Rh(CO)(2)Cl], [Pd(allyl)Cl], and [AuCl]) triazol-S-ylidene metal complexes. In solution, all metal complexes feature symmetrical patterns displaying C-2 and C-3 fold axes when supported by di- and tritriazol-S-ylidene ligands. The vibration frequencies of Ln.[Rh(CO)(2)Cl] (n = 1-3) complexes indicate that the electron-donor properties of the new ligands are comparable to those for previously reported MIC complexes and superior to classical NHCs. Prompting coordination of the vicinal phenoxy group to the metal centers proved unsuccessful after treatment of the Ln-[Rh(CO)(2)Cl](n) and Ln.[Pd(allyl)Cl](n) (n = 1-3) precursors with AgBF4; the expected chelated cationic complexes were highly unstable, indicating a weak or no coordination availability through the oxygen atom. Crystal structures of the complexes L1.[AuI] and L2A.[Pd(allyl)I](2) illustrated the metal center geometrical environment and confirmed the lack of coordination through the phenoxy moiety of the ligand. Preliminary catalytic trials established the enhanced performance of di- and trimetallic palladium complexes in cross-coupling reactions and the intramolecular cyclization of enynes catalyzed by gold complexes.
present methodology could be useful for the building up of multi-triazole libraries easily tunable with donor or attractor functional groups. A versatile one-pot synthesis of a series of mono-, bis- and tris-1,2,3-triazoles supported by commercially available hydroxybenzene scaffolds has been developed employing clickchemistry. The multicomponent copper(I)-catalyzed 1,3-dipolar cycloaddition of sodium azide
Structural diversity of phenoxy functionalized triazol-5-ylidene palladium(II) complexes and their application in C–N bond formation
作者:Daniel Mendoza-Espinosa、Rodrigo González-Olvera、Cecilia Osornio、Guillermo E. Negrón-Silva、Alejandro Álvarez-Hernández、Claudia I. Bautista-Hernández、Oscar R. Suárez-Castillo
DOI:10.1016/j.jorganchem.2015.12.021
日期:2016.2
palladium acetate and the cationic precursors was carried out with equimolar amounts in presence of sodium iodide, the μ2-I2 bridged complexes 5 and 6 of the type [(MIC)PdI2]2 were obtained as unique products. Additionally, the preparation of the heteroleptic PEPPSI-type complexes ([Py(PdI2)MIC]) 7 and 8 was readily achieved by the thermal treatment of the triazolium precursors with PdCl2, K2CO3, and sodium
据报道制备和分离了多种单,双和杂配的中离子三唑-5-亚甲基钯(II)配合物。苯氧基官能化的三唑盐的治疗[ BN -MIC(H)] +我- (1)和[的Mes -MIC(H)] +我- (2)用乙酸钯的一半当量,所产生的复合物3和4与一般的[(MIC)2 Pd(I)2 ]的结构为顺式/反式异构体混合物。当乙酸钯与阳离子前体的反应在碘化钠存在下以等摩尔量进行时,μ获得[[MIC] PdI 2 ] 2型的2- I 2桥接复合物5和6作为独特产物。另外,通过用吡啶中的PdCl 2,K 2 CO 3和碘化钠对三唑鎓前体进行热处理,可以容易地制备杂配PEPPSI型复合物([Py(PdI 2)MIC])7和8。所有配合物均已通过1 H和13 C NMR,FT-IR,元素分析以及在2、3反式,6,和7单晶X射线衍射。钯系列的初步催化结果建立了在温和的反应条件下,Buchwald-Hartwing催化的芳基
Copper(<scp>ii</scp>) complexes supported by click generated mixed NN, NO, and NS 1,2,3-triazole based ligands and their catalytic activity in azide–alkyne cycloaddition
作者:Daniel Mendoza-Espinosa、Guillermo Enrique Negrón-Silva、Deyanira Ángeles-Beltrán、Alejandro Álvarez-Hernández、Oscar R. Suárez-Castillo、Rosa Santillán
DOI:10.1039/c4dt00323c
日期:——
new copper(II) complexes supported by click generated mixed NN, NO, and NS 1,2,3-triazoles are reported. The four complexes display a 1 : 2 copper/ligand ratio and give monomeric units in the solidstate. Crystal structures demonstrate that depending on the flexibility of the ligand NX (X = O, N, S) pendant arm, the coordination environment around the metal center can feature squareplanar or octahedral
Electrochemical assessment of phenol and triazoles derived from phenol (BPT) on API 5L X52 steel immersed in 1 M HCl
作者:A. Espinoza-Vázquez、F. J. Rodríguez-Gómez、R. González-Olvera、D. Angeles-Beltrán、D. Mendoza-Espinosa、G. E. Negrón-Silva
DOI:10.1039/c6ra09832k
日期:——
long immersion times, the organic inhibitor BPTI showed good corrosionprotection during 504 hours of immersion with η > 80%. Furthermore, the hydrodynamic conditions proved that organic molecules experience a desorption process related to the different rotation velocities employed. Finally, it was demonstrated by SEM that the corrosion velocity is diminished when using the BPTI inhibitor at 50 ppm
1,2,3-Triazole derivatives as antitubercular agents: synthesis, biological evaluation and molecular docking study
作者:Mubarak H. Shaikh、Dnyaneshwar D. Subhedar、Laxman Nawale、Dhiman Sarkar、Firoz A. Kalam Khan、Jaiprakash N. Sangshetti、Bapurao B. Shingate
DOI:10.1039/c5md00057b
日期:——
A library of thirty one 1,2,3-triazole derivatives efficiently preparedviaclick chemistry and evaluated for their antitubercular, antioxidant, and cytotoxic activities.