Carbon-13 and proton magnetic resonance spectra of 2,2-dialkyl-5,5-dimethylcyclohexane-1,3-diones (2,2-dialkyldimedones)

Abstract

Proton and natural abundance carbon-13 Fourier transform n.m.r. spectra of ten 2,2-dialkyldimedones have been examined at 100 and 20 MHz respectively. Chemical shifts have been assigned in each case. In contrast to the significant long-range anisotropic shielding observed in the ¹H n.m.r. spectra of 2-benzyl compounds, there was a slight deshielding of the corresponding carbon nuclei in the ¹³C spectra. The preparation of several new dialkyldimedones is also described.