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Anwendung der NMR-Spektroskopie chiraler Assoziate 6: rotation about the C(sp²)—C(aryl) bond in 2,6-disubstituted pivalophenones

Holík, M. ; Mannschreck, Albrecht



Abstract

For the investigation of the barrier to rotation about the C(sp2)—C(aryl) bond in non-planar pivalophenones five derivatives were prepared and their 1H and 13C NMR spectra assigned. Methyl and bromine groups in the 3-position have opposite substituent effects on the chemical shifts of the 1H and 13C signals of Me2 and Me4. The ΔGmath image values were determined from the coalescence temperatures ...

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