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- W2003205458 abstract "The cis (Z) isomers of β-alkoxy-α,β-unsaturated ketones, R1COCH=CR2OR3, have been shown by IR spectra to exist as a mixture of s-cis (ZZ) and s-trans (ZE) rotamers, with the equilibrium shifting towards the former upon increasing the steric requirements of the R1 substituent. The trans (E) isomers have uniformly the s-cis (EZ) structure. O-s-trans (or non-planar) and O-s-cis conformations due to rotation around the Csp2–O bond have been proposed for the Z and E isomers, respectively. Based on known structures, a rationalization of the rule governing the chemical shifts of R1 and R2 protons, called here the “ene-one cross shielding rule”, has been offered." @default.
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- W2003205458 modified "2023-10-18" @default.
- W2003205458 title "Rotational Isomerism in β-Diketone<i>cis</i>and<i>trans</i>Enol Ethers. An IR and PMR Study" @default.
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- W2003205458 doi "https://doi.org/10.1246/bcsj.49.981" @default.
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