Catalytically Active Cu(II)-Pybox Complexes: Insights by EPR Spectroscopy and DFT Computations

被引：0
作者：
V. Umamaheswari
Pawel Cias
Andreas Pöppl
Georg Gescheidt
机构：
[1] Graz University of Technology,Institute of Physical and Theoretical Chemistry
[2] NAWI Graz,Faculty of Physics and Earthscience
[3] University of Leipzig,Erlangen Catalysis Resource Center
[4] University of Erlangen-Nürnberg,undefined
来源：
Applied Magnetic Resonance | 2014年 / 45卷
关键词：
Electron Paramagnetic Resonance; Electron Paramagnetic Resonance Spectrum; Alder Reaction; Pulse Electron Paramagnetic Resonance; HYSCORE Spectrum;
D O I：
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中图分类号：
学科分类号：
摘要：
This paper addresses the geometry of the catalytic Cu(II) complexes formed in the course of stereoselective Diels–Alder reaction. The parent catalyst is [Cu(II)-isopropyl-pybox](OTf)2. Ethyl glyoxylate serves as dienophile and it reacts with 1,3-cyclohexadiene. The reaction is followed by CW EPR, HYSCORE, and (pulsed) ENDOR spectroscopy and the experimental results are supported by DFT computations. It is shown that during the catalytic process, the Cu(II) complex is pentacoordinated and one of the triflate counterions is coordinated to the Cu(II) center in axial position.
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页码：667 / 679
页数：12
相关论文
共 153 条
[1]  
Desimoni G(2008)undefined Chem. Eur. J. 14 3630-undefined
[2]  
Faita G(2010)undefined Tetrahedron 66 3024-undefined
[3]  
Toscanini M(2012)undefined Eur. J. Org. Chem. 15 2916-undefined
[4]  
Boiocchi M(2005)undefined J. Org. Chem. 70 5536-undefined
[5]  
Faita G(2003)undefined Chem. Rev. 103 3119-undefined
[6]  
Mella M(2007)undefined Chem. Eur. J. 13 9478-undefined
[7]  
Toscanini M(1999)undefined J. Am. Chem. Soc. 121 7582-undefined
[8]  
Desimoni G(1999)undefined J. Am. Chem. Soc. 121 669-undefined
[9]  
Desimoni G(1996)undefined Tetrahedron Lett. 37 7481-undefined
[10]  
Faita G(1996)undefined J. Am. Chem. Soc. 118 5814-undefined
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