Abstract
Proton magnetic resonance (PMR) and 13CH satellite spectra have been obtained and analyzed for acrolein, crotonaldehyde, α-methacrolein, and tiglaldehyde. The aldehyde proton spectrum exhibits an interesting concentration dependence which is accounted for in the analysis. The β-proton shifts are also sensitive to concentration, probably reflecting a tendency toward dipolar association. 13CH coupling constants have been evaluated for every position in the series studied and, in addition, some long-range 13CH couplings are essential to account for the spectra. The chemical shifts of acrolein have been compared with those in ethylene and butadiene. The effects of methyl substitution upon the various chemical shifts in acrolein show little regularity, possibly because of cross-conjugation in the substituted systems.
Published Version
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