Conformations of cycloalkenyl radicals: A dynamic EPR study of the cyclohept‐4‐enyl radical

John C. Walton

doi:10.1002/mrc.1260260512

Conformations of cycloalkenyl radicals: A dynamic EPR study of the cyclohept‐4‐enyl radical

John C. Walton^*

^*Corresponding author for this work

School of Chemistry

Research output: Contribution to journal › Article › peer-review

Abstract

Cyclopent‐3‐enyl, cyclohex‐3‐enyl and cyclohept‐4‐enyl radicals were generated and their EPR spectra obtained in solution over a range of temperatures. The spectral data were consistent with a fully planar conformation for cyclopent‐3‐enyl radicals and a slightly flattened half‐chair conformation for cyclohex‐3‐enyl radicals. Cyclohept‐4‐enyl radicals showed exchange broadening in their EPR spectra which indicated inversion from one chair conformer to another with an Arrhenius activation barrier of 16.5 ± 0.3 kJ mol^‐1.

Original language	English
Pages (from-to)	412-415
Number of pages	4
Journal	Magnetic Resonance in Chemistry
Volume	26
Issue number	5
DOIs	https://doi.org/10.1002/mrc.1260260512
Publication status	Published - 1 Jan 1988

Keywords

Cycloalkenyl radicals
EPR
Radicals
Ring conformations

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abstract = "Cyclopent‐3‐enyl, cyclohex‐3‐enyl and cyclohept‐4‐enyl radicals were generated and their EPR spectra obtained in solution over a range of temperatures. The spectral data were consistent with a fully planar conformation for cyclopent‐3‐enyl radicals and a slightly flattened half‐chair conformation for cyclohex‐3‐enyl radicals. Cyclohept‐4‐enyl radicals showed exchange broadening in their EPR spectra which indicated inversion from one chair conformer to another with an Arrhenius activation barrier of 16.5 ± 0.3 kJ mol‐1.",

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N2 - Cyclopent‐3‐enyl, cyclohex‐3‐enyl and cyclohept‐4‐enyl radicals were generated and their EPR spectra obtained in solution over a range of temperatures. The spectral data were consistent with a fully planar conformation for cyclopent‐3‐enyl radicals and a slightly flattened half‐chair conformation for cyclohex‐3‐enyl radicals. Cyclohept‐4‐enyl radicals showed exchange broadening in their EPR spectra which indicated inversion from one chair conformer to another with an Arrhenius activation barrier of 16.5 ± 0.3 kJ mol‐1.

AB - Cyclopent‐3‐enyl, cyclohex‐3‐enyl and cyclohept‐4‐enyl radicals were generated and their EPR spectra obtained in solution over a range of temperatures. The spectral data were consistent with a fully planar conformation for cyclopent‐3‐enyl radicals and a slightly flattened half‐chair conformation for cyclohex‐3‐enyl radicals. Cyclohept‐4‐enyl radicals showed exchange broadening in their EPR spectra which indicated inversion from one chair conformer to another with an Arrhenius activation barrier of 16.5 ± 0.3 kJ mol‐1.

KW - Cycloalkenyl radicals

KW - EPR

KW - Radicals

KW - Ring conformations

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DO - 10.1002/mrc.1260260512

M3 - Article

AN - SCOPUS:84947424047

SN - 0749-1581

VL - 26

SP - 412

EP - 415

JO - Magnetic Resonance in Chemistry

JF - Magnetic Resonance in Chemistry

IS - 5

ER -

Conformations of cycloalkenyl radicals: A dynamic EPR study of the cyclohept‐4‐enyl radical

Abstract

Keywords

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