Synthesis and crystal structures of salen-type Cu(<scp>ii</scp>) and Ni(<scp>ii</scp>) Schiff base complexes: application in [3+2]-cycloaddition and A<sup>3</sup>-coupling reactions
作者:Bhumika Agrahari、Samaresh Layek、Rakesh Ganguly、Devendra D. Pathak
DOI:10.1039/c8nj01718b
日期:——
synthesis of two new salen-type Schiff base complexes of the type [Cu(L)]·0.5H2O, 1, and [Ni(L)], 2, from the reaction of a 6,6′-[(1E,1′E)-(cyclohexane-1,2-diylbis(azanylylidene))bis(methanylylidene)bis(3-(diethylamino)phenol)] salen-type Schiff base ligand (H2L) with Cu(OAc)2·H2O and Ni(OAc)2·4H2O in methanol at room temperature, respectively, is described. The complexes are isolated as coloured crystalline
的类型的两个新的沙仑型席夫碱配合物[铜(L)]·0.5H的合成2 O,1,和[镍(L)],2,从的6,6'的反应- [( 1 ë,1' ë) - (环己烷-1,2-二基二(azanylylidene))双(methanylylidene)双(3-(二乙基氨基)苯酚)]沙仑型席夫碱配体(H 2 L)与铜(OAC)2 ·H 2 O和Ni(OAc)2 ·4H 2描述了分别在室温下在甲醇中的O。将该配合物分离为有色结晶固体,并通过元素分析,FT-IR光谱,UV-可见光谱和单晶X射线衍射研究对其进行表征。具有g iso = 2.076的配合物1的顺磁性质已通过EPR研究得到证实,这表明配合物的方形平面几何形状发生了扭曲。与此相反,发现镍络合物本质上是抗磁性的,并且另外通过1 H NMR表征。配合物1和2的晶体结构证实了两种配合物的扭曲的正方形平面几何形状。综合大楼1被发现是一种较好的催化剂,可通过[3
Metal- and catalyst-free, one-pot, three-component synthesis of propargylamines in magnetized water: experimental aspects and molecular dynamics simulation
Magnetized water (MW), as a green-promoting medium, is applied for the one-pot, metal- and catalyst-free, practical, efficient, and environmentally benign three-component reactions of aldehydes, amines, and alkynes. The salient features of this novel methodology are its simplicity, low cost, short reaction time, high reaction yield, easy work-up, and absence of hazardous organic solvents. Moreover
Regioselective synthesis of unsymmetrical biheteroaryls <i>via</i> copper(<scp>ii</scp>)-catalyzed cascade annulation
作者:Sadhanendu Samanta、Alakananda Hajra
DOI:10.1039/c8cc00671g
日期:——
A facile and efficient copper-catalyzed cascade annulation of an imidazoheterocycle with salicylaldehyde, piperidine, and terminal alkyne was developed to afford unsymmetrical biheteroaryl derivatives. A variety of biheteroaryl structural motifs containing furans and imidazoheterocycles have been synthesized in ambient air in high yields. The experimental results suggest that the reaction proceeds
With a tandem DMAP-catalyzed reaction between o-AQM, in which it is generated in situ from propargylic amine, and acyl carbene surrogate (from pyridinium ylide), a variety of polyarylated chromenes are assembled in good yields. This process does not require transition-metal catalyst and exhibits easy manipulation of the arene group and good functional group compatibility, particularly the −Br group
Nano magnetite supported metal ions as robust, efficient and recyclable catalysts for green synthesis of propargylamines and 1,4-disubstituted 1,2,3-triazoles in water
Nano magnetite functionalized 2,2′-biimidazole complex of metal ions Cu(I), Cu(II), Ni(II) and Co(II) were successfully synthesized and characterized by different techniques such as elemental analysis, FT-IR spectroscopy, X-ray diffraction (XRD), thermo gravimetric analysis (TGA), transmission electron microscopy (TEM), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM with