Electron spin resonance studies of atom transfer reactions involving crown ether-tight ion pair complexes

1977 ◽  
Vol 81 (20) ◽  
pp. 1928-1932 ◽  
Author(s):  
M. P. Eastman ◽  
Y. Chiang ◽  
G. V. Bruno ◽  
C. A. McGuyer
Keyword(s):  
Electron Spin Resonance ◽  
Crown Ether ◽  
Electron Spin ◽  
Ion Pair ◽  
Transfer Reactions ◽  
Atom Transfer ◽  
Spin Resonance ◽  
Atom Transfer Reactions

Characterization of Cu(II) Bipyridine Complexes in Halogen Atom Transfer Reactions by Electron Spin Resonance

2003 ◽  
Vol 36 (22) ◽  
pp. 8291-8296 ◽  
Author(s):  
Bernhard Knuehl ◽  
Tomislav Pintauer ◽  
Atsushi Kajiwara ◽  
Hanns Fischer ◽  
Krzysztof Matyjaszewski
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Halogen Atom ◽  
Transfer Reactions ◽  
Atom Transfer ◽  
Spin Resonance ◽  
Atom Transfer Reactions

A PARAMAGNETIC RESONANCE STUDY OF HINDERED DIARYLMETHYL RADICALS AND RELATED COMPOUNDS: I. ANALYSIS OF THE SPECTRA

1966 ◽  
Vol 44 (12) ◽  
pp. 1387-1395 ◽  
Author(s):  
H. R. Falle ◽  
F. C. Adam
Keyword(s):  
Electron Spin Resonance ◽  
Electron Spin ◽  
Ion Pair ◽  
Coupling Constants ◽  
Methyl Groups ◽  
Steric Repulsion ◽  
Paramagnetic Resonance ◽  
Spin Resonance ◽  
Phenyl Rings ◽  
Related Compounds

Several ortho-substituted radicals of the benzhydryl type and a variety of diaryl ketyls have been studied through the nuclear hyperfine structure of their electron spin resonance spectra. A strong similarity is found between the spectra of a given ketyl and its hydrocarbon analogue. This suggests that when ketones are reduced, a very tight ion pair is formed between the ketyl anion and its cation. Although the coupling constants of the protons vary with different reducing agents, larger variations are observed when bulky groups are substituted into ortho positions. These larger changes are attributed to a forced internal rotation of the phenyl rings. The distortion results from the steric repulsion between the ortho groups. The effect of 'buttressing' of ortho methyl groups is also studied. Deuterium and 13C substitutions have been effected in some of the compounds.

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