The synthesis and characterisation of europium terpyridine-N-oxide complexes
作者:Angelo J. Amoroso、Miles W. Burrows、Robert Haigh、Malcolm Hatcher、Mark Jones、Ulrich Kynast、K. M. Abdul Malik、Dorota Sendor
DOI:10.1039/b616758f
日期:——
Europium complexes of a series of terpyridine-N-oxide ligands have been prepared and structurally characterised by crystallographic studies. While the addition of three equivalents of terpyridine-1-oxide or terpyridine-1,1'-bisoxide results in complexes with nine co-ordinate tricapped trigonalprismatic or monocapped square antiprismatic geometries, respectively, three equivalents of the terpyridine-1
The synthesis and structure of terpyridine-N-oxide complexes of copper(<scp>ii</scp>) perchlorate
作者:Angelo J. Amoroso、Miles W. Burrows、Simon J. Coles、Robert Haigh、Robert D. Farley、Michael B. Hursthouse、Mark Jones、K. M. Abdul Malik、Damien M. Murphy
DOI:10.1039/b713444d
日期:——
The co-ordination of a series of terpyridine-N-oxide ligands to the Cu(II) ion is reported. Addition of two equivalents of ligand results in the formation of the expected 2 : 1 six co-ordinate product, while the addition of one equivalent of ligand allows the isolation of 1 : 1 species if the ligand has a meridonal binding mode. The five complexes isolated were characterised in the solid state by X-ray crystallography while they are studied in solution using EPR, UV-vis spectroscopy and IR spectroscopy.
Base-promoted, deborylative secondary alkylation of N-heteroaromatic N-oxides with internal gem-bis[(pinacolato)boryl]alkanes: a facile derivatization of 2,2′-bipyridyl analogues
作者:Chiwon Hwang、Woohyun Jo、Seung Hwan Cho
DOI:10.1039/c7cc03731g
日期:——
A base-promoted, secondary alkylation of N-heteroaromatic N-oxides using internal gem-bis[(pinacolato)boryl]alkanes as alkylation reagents is reported. The reaction exhibit broad scope, providing deoxygenated secondary alkylated N-heteroaromatic compounds with high efficiency. The usefulness of the developed protocol is evidenced by sequential direct alkylation of 2,2′-bipyridine-N-oxide.
Complexation of lanthanides, actinides and transition metal cations with a 6-(1,2,4-triazin-3-yl)-2,2′:6′,2′′-terpyridine ligand: implications for actinide(iii)/lanthanide(iii) partitioning
作者:Frank W. Lewis、Laurence M. Harwood、Michael J. Hudson、Michael G. B. Drew、Michal Sypula、Giuseppe Modolo、Daniel Whittaker、Clint A. Sharrad、Vladimira Videva、Véronique Hubscher-Bruder、Françoise Arnaud-Neu
DOI:10.1039/c2dt30522d
日期:——
behavior to related BTBP complexes. In methanol, the stabilityconstants of the Ln(III) complexes are slightly lower than those of the analogous quadridentate bis-triazine BTBP ligands, while the stabilityconstant for the Yb(III) complex is higher. 1H NMR titrations and ESI-MS with lanthanide nitrates showed that the ligand forms only 1 : 1 complexes with Eu(III), Ce(III) and Yb(III), while both 1 : 1 and
四齿N-杂环配体6-(5,5,8,8-四甲基-5,6,7,8-四氢-1,2,4-苯并三嗪-3-基)-2,2':6',合成了2''-吡啶(CyMe 4 -hemi-BTBP),并通过X射线晶体分析Am(III),U(VI),Ln(III)和一些过渡金属阳离子对其相互作用进行了评估。 (III)/ Eu(III)溶剂萃取实验,紫外吸收分光光度法,NMR研究和ESI-MS。与Eu(III),Ce(III)和线性铀酰(UO 2 2+通过X射线晶体学分析获得离子,它们显示出与相关BTBP配合物相似的配位行为。在甲醇,Ln(III)配合物的稳定常数略低于类似四元体的稳定常数双三嗪BTBP配体,而Yb(III)配合物的稳定性常数更高。1 H NMR滴定法和硝酸镧系元素的ESI-MS分析表明,配体仅与Eu(III),Ce(III)和Yb(III)形成1:1的配合物,而与Eu(III),Ce(III)和Yb(III)形成的配合物均为1
Regioselective synthesis of 4-functionalized pyridines
作者:Chao Li、Zixi Yan、Bingding Wang、Jiaxing Li、Weiping Lyu、Zhixing Wang、Ning Jiao、Song Song
DOI:10.1016/j.chempr.2023.10.015
日期:2024.2
pyridine derivatives. However, this reaction is still unexplored because of the inert property of pyridine and the challenge in the regioselectivity. Herein, we report an aromatic C-4 selective functionalization of pyridine -oxides with DABCO and TfO as the regioselective controller. The commercial availability of reagents, good tolerance of functional groups, and simple operability made it a promising