Abstract
A negative 1H, 1H three-bond coupling 3 J( CHO), H) was found for glycolaldehyde by varying solvent composition. A negative 3 J( CHO), C) is demonstrated for di- tert-butyl ethanal by following the temperature dependence of the coupling. 3 J g B( CHO), H) of −0.73 and 3 J g ( CHO), C) of −0.26 Hz (g = gauche) for the compounds were estimated by fitting the temperature dependence of the couplings by using the two-site approach. The conformational behavior of the vicinal couplings in aliphatic aldehydes and the conformations of the title compounds are briefly discussed.
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