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231224s2011 xx |||||o 00| ||eng c |
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|a 10.1002/mrc.2710
|2 doi
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|a eng
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|a Julià, Luis
|e verfasserin
|4 aut
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|a An EPR analysis of β-dimerization in α-blocked pyrroles in oxidant conditions
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|c 2011
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
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|2 rdamedia
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|a ƒa Online-Ressource
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|a Date Completed 01.08.2011
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Copyright © 2011 John Wiley & Sons, Ltd.
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|a Electron paramagnetic resonance (EPR) analysis of neutral and acidic solutions of 2,5-dimethyl-1-phenylpyrrol (1) and meta-, para-, and ortho-bis(2,5-dimethylpyrrol-1-yl)benzenes (4-6) in the presence of Tl(III) trifluoroacetate as oxidant reveals the poor stability of their generated monomeric radical cations which dimerize through C(β)-C(β) bond formation. EPR spectra of the monomeric radical cations 4(•+) , 5(•+) , and 6(•+) coincide with that of 1(•+) , suggesting that the unpaired electron in these charged species is confined in one of the pyrrolic rings. The very twisted angles between pyrrolic and phenyl planes due to steric hindrance in the X-ray analysis of the molecular structure of 4 confirm the absence of extended conjugation in the π-system
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Fluoroacetates
|2 NLM
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|a Free Radicals
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|a Oxidants
|2 NLM
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|a Pyrroles
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|a thallium trifluoroacetate
|2 NLM
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|a 23586-53-0
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|a Thallium
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|a Trifluoroacetic Acid
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|a Rius, Jordi
|e verfasserin
|4 aut
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|a Torrelles, Xavier
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Magnetic resonance in chemistry : MRC
|d 1985
|g 49(2011), 4 vom: 01. Apr., Seite 164-7
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|x 1097-458X
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|g volume:49
|g year:2011
|g number:4
|g day:01
|g month:04
|g pages:164-7
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