Diastereoselective synthesis, structure and reactivity studies of ferrocenyloxazoline gold(i) and gold(ii) complexes.
Diastereoselective synthesis, structure and reactivity studies of ferrocenyloxazoline gold(i) and gold(ii) complexes.
复制标题
二茂铁基恶唑啉金(i)和金(ii)配合物的非对映选择性合成、结构和反应性研究
DOI:
10.1039/c8dt00109j
复制
发表时间:
--
影响因子:
4
通讯作者:
R. Peters
中科院分区:
文献类型:
--
作者:
J. Holz;M. Ayerbe-García;W. Frey;F. Krupp;R. Peters
In the last few decades, gold complexes have demonstrated huge potential for soft Lewis acid catalysis. Despite the intensive research on Au complexes and planar chiral metallacycles, enantiopure ferrocenylgold complexes have – surprisingly – not been reported until the studies presented in this article. Herein, we report the asymmetric synthesis of planar chiral ferrocenyl Au(I) complexes. These dinuclear species form helically chiral ten-membered (NCCCAu)2 rings stabilized by aurophilic interactions. In supramolecular solid state structures, linear, zigzag or helical Au(I) wires with regular Au⋯Au separations were observed. The dissolved dinuclear entities could be oxidized by Au(I) to unique ferrocenyl Au(II) complexes featuring short Au(II)–Au(II) bonds, while the ferrocene core remained intact. However, our initial studies revealed the issue of configurational lability of the ferrocenyl Au(II) complexes in terms of the element of planar chirality in the presence of the gold source, (Me2S)AuCl. This was successfully addressed by a systematic study implementing permanent σ-donor ortho-protecting groups such as methyl and trimethylsilyl, which impede an epimerization event. Oxidation of the dinuclear Au(I) complexes was also accomplished by oxidative addition reactions with halogenated solvents, preferably CHCl3. Additional reactivity studies revealed that dinuclear Au(II) dihalide complexes are also formed with reactive alkylhalides such as iodomethane, benzylbromide and benzyliodide. Interestingly, the whole spectral range of colors (violet, blue, green, yellow, and red) is covered by the title complexes depending on the Au oxidation state and the anionic ligands in the Au(II) complexes. This appears to be quite unusual for ferrocenes, which typically adopt orange to red colors in a non-oxidized state.
登录
查看更多内容
影响因子:
15
作者:
Melhado, Asa D.;Brenzovich, William E., Jr.;Lackner, Aaron D.;Toste, F. Dean
通讯作者:
Toste, F. Dean
影响因子:
2.3
作者:
G. E. Herberich;U. Englert;T. Wirth
通讯作者:
G. E. Herberich;U. Englert;T. Wirth
DOI:
--
发表时间:
1979
期刊:
影响因子:
--
作者:
H. Schmidbaur;F. Wagner;Anette Wohlleben‐Hammer
通讯作者:
Anette Wohlleben‐Hammer
DOI:
--
发表时间:
1976
期刊:
影响因子:
--
作者:
H. Schmidbaur;J. Mandl;F. Wagner;D. V. D. Vondel;G. P. D. Kelen
通讯作者:
G. P. D. Kelen
DOI:
--
发表时间:
1998
期刊:
影响因子:
--
作者:
K. Jacob;F. Voigt;K. Merzweiler;C. Wagner;Piero Zanello;M. Fontani;C. Pietzsch
通讯作者:
C. Pietzsch