H-Abstraction from p-Substituted Benzaldehydes by Bis-perfluoroalkyl Nitroxides──A New Attempt for Establishing Substituent Constants of Spin Delocalization σ by EPR Method

Chem. J. Chinese Universities ›› 1994, Vol. 15 ›› Issue (1): 63.

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H-Abstraction from p-Substituted Benzaldehydes by Bis-perfluoroalkyl Nitroxides──A New Attempt for Establishing Substituent Constants of Spin Delocalization σ by EPR Method

ZHAO Cheng-Xue¹, QU Yan-Ling¹, ZHANG Wei-Xin¹, JIANG Xi-Kui², CHEN Guo-Fei²

1. Departmient of Chemistry, Huazhong University of Science and Technology, Wuhan, 430074;
2. Shanghai Institute of Organic Chemistry, Shanghai

Received:1993-03-10 Revised:1993-07-31 Online:1994-01-24 Published:1994-01-24

Abstract

Abstract: R_FN(O·)R_F and R_FNO dissolved in F113 reacted with a series of p-substituted benzaldehydes at r,t.and ended up with very stable p-substituted benzoyl perfluoroalkyl nitroxides.Correlation analysis(△a_N or △a_F^β vis σ only;△a_N vis σand σ both) disclosed that the polar effect is the major factor varying the spin density on the nitrtigen atom of the fluorinated acylnitroxides while the effect through spin delocalization is almost negligible.

Key words: Hydrogen abstraction, p-Substituted benzoyl fluoroalkyl nitroxides, Correlation analysis, Polar effects, Spin delocalization

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ZHAO Cheng-Xue, QU Yan-Ling, ZHANG Wei-Xin, JIANG Xi-Kui, CHEN Guo-Fei. H-Abstraction from p-Substituted Benzaldehydes by Bis-perfluoroalkyl Nitroxides──A New Attempt for Establishing Substituent Constants of Spin Delocalization σ by EPR Method[J]. Chem. J. Chinese Universities, 1994, 15(1): 63.

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H-Abstraction from p-Substituted Benzaldehydes by Bis-perfluoroalkyl Nitroxides──A New Attempt for Establishing Substituent Constants of Spin Delocalization σ by EPR Method

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