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Alkyl vinyl ketones have two conformations, s-cis and s-trans. The ratios of the two conformers are given by comparing their IR with NMR data. The conformer of s-cis is given by the equation, Percentage of s-cis=180. (Δδ−0.15) (%), where Δδ is the chemical shift difference between cis and trans protons for carbonyl group. The value of ΔF obtained by means of the equation is related to steric factors Esc of bearing alkyl groups. The ratio s-cis/s-trans is determined by the bulkiness of the alkyl group.
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Naito et al. (1976) studied this question.
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