外消旋丙交酯与三齿与双齿钴 (II)、锌 (II) 和镉 (II) 配合物的合成、结构和催化效率-二甲基-1H-吡唑-1-基)甲基)胺配体
摘要:
由 1-(3,5-dimethyl-1 H -pyrazol-1-yl) -N -((3,5-dimethyl- ) 支持的一系列 Co( II )、Zn( II ) 和 Cd( II ) 配合物1 H-吡唑-1-基)甲基) -N- (呋喃-2-基甲基)甲胺(LA )和N , N-双((3,5-二甲基-1H-吡唑-1-基)甲基)-4-异丙基苯胺(LB )合成。CoCl 2 ·6H 2 O、ZnCl 2和CdBr 2 ·4H 2 O被配体直接螯合产生[L n MX 2] (L n = L A或 L B;M = Zn 或 Co,其中 X = Cl;M = Cd,其中 X = Br) 配合物具有高产率。结构研究表明,[L B CoCl 2 ]和[L B ZnCl 2 ]采用扭曲的四面体几何形状,因为 L B以双齿方式配位金属中心,而 L A通过氮原子以三齿方式配位金属中心吡唑和胺部分,因此[L A
Iron(ii) complexes with functionalized amine-pyrazolyl tripodal ligands in the cross-coupling of aryl Grignard with alkyl halides
作者:Fei Xue、Jin Zhao、T. S. Andy Hor
DOI:10.1039/c1dt10258c
日期:——
Structurally distinctive Fe(II) complexes with furan, thiophene and pyridine functionalized amine-pyrazolyl tripodal hybrid ligands have been synthesized and crystallographically characterized. The tether substituent at the central amine plays an active role in determining the coordination mode of the ligand and the metal geometry. All complexes are catalytically active towards cross-coupling of aryl Grignard reagents with primary and secondary alkyl halides with β-hydrogen under ambient conditions. ESI-MS spectra analysis revealed the ligand-stabilised Fe(II) and Mg(II) species.
Cross-coupling of alkyl halides with aryl or alkyl Grignards catalyzed by dinuclear Ni(ii) complexes containing functionalized tripodal amine-pyrazolyl ligands
作者:Fei Xue、Jin Zhao、T. S. Andy Hor
DOI:10.1039/c3dt32111h
日期:——
Structurally distinctive dinuclear Ni(II) complexes with furan or thiophene tethered amine-pyrazolyl tripodal hybrid ligands have been synthesized and crystallographically characterized. All complexes are catalytically active towards cross-coupling of aryl/alkyl Grignard reagents with β-H containing alkyl halides at room temperature in the presence of N,N,N′,N′-tetramethylethylenediamine (TMEDA). The catalytic efficacy of the complexes is dependent on the tether substituent at the central amine. Two species, Ni(II) TMEDA and Mg(II) TMEDA complexes, have been isolated from the catalytic reaction mixtures under different conditions. Some ligand-stabilized Ni(II) and Mg(II) bimetallic species have also been identified in the ESI-MS spectra.
Synthesis, structures, and catalytic efficiency in ring opening polymerization of <i>rac</i>-lactide with tridentate <i>vs.</i> bidentate cobalt(<scp>ii</scp>), zinc(<scp>ii</scp>), and cadmium(<scp>ii</scp>) complexes containing <i>N</i>-substituted <i>N</i>,<i>N</i>-bis((3,5-dimethyl-1<i>H</i>-pyrazol-1-yl)methyl)amine ligands
作者:Solhye Choe、Hyosun Lee、Saira Nayab
DOI:10.1039/d1ra02365a
日期:——
Cd(II) complexes supported by 1-(3,5-dimethyl-1H-pyrazol-1-yl)-N-((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-N-(furan-2-ylmethyl)methanamine (LA) and N,N-bis((3,5-dimethyl-1H-pyrazol-1-yl)methyl)-4-isopropylaniline (LB) were synthesized. The direct chelation of CoCl2·6H2O, ZnCl2, and CdBr2·4H2O by the ligands produced [LnMX2] (Ln = LA or LB; M = Zn or Co, with X = Cl; M = Cd, with X = Br) complexes in high
由 1-(3,5-dimethyl-1 H -pyrazol-1-yl) -N -((3,5-dimethyl- ) 支持的一系列 Co( II )、Zn( II ) 和 Cd( II ) 配合物1 H-吡唑-1-基)甲基) -N- (呋喃-2-基甲基)甲胺(LA )和N , N-双((3,5-二甲基-1H-吡唑-1-基)甲基)-4-异丙基苯胺(LB )合成。CoCl 2 ·6H 2 O、ZnCl 2和CdBr 2 ·4H 2 O被配体直接螯合产生[L n MX 2] (L n = L A或 L B;M = Zn 或 Co,其中 X = Cl;M = Cd,其中 X = Br) 配合物具有高产率。结构研究表明,[L B CoCl 2 ]和[L B ZnCl 2 ]采用扭曲的四面体几何形状,因为 L B以双齿方式配位金属中心,而 L A通过氮原子以三齿方式配位金属中心吡唑和胺部分,因此[L A