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The E.S.R. spectra of the fl-fluoroisopropyl radical and the fl-fluoro, fl,fl-difluoro and fl,fl, fl-trifluoroethyl radicals have been recorded in fluid solutions. The conformational preferences and barriers to internal rotation in these species have been determined from an investigation of the temperature dependence of the fi-fluorine and fi-proton hyperfine coupling constants. The experimental hyperfine splittings have been compared with theoretical values calculated by the INDO method.

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Mittels ESR‐Spektroskopie wird der Unterschied von 0‐ gegenüber S‐haltigen Radikalen hinsichtlich deren Planarität, Elektronendelokalisierung und Rotationsbarrieren an den Modellverbindungen (I)‐(IV) untersucht.