VT 1H NMR investigations of resonance-assisted intramolecular hydrogen bonding in 4-(dimethylamino)-2'-hydroxychalcone.
[reaction: see text] Resonance-assisted intramolecular hydrogen bonding in both polar aprotic and nonpolar solutions of 4-(dimethylamino)-2'-hydroxychalcone (DMAHC) has been investigated by variable-temperature proton NMR spectroscopy. In both nonpolar and polar solvents, the signal for the phenolic hydrogen moves downfield as the temperature is lowered. In each solvent system studied, a linear relationship between chemical shift and temperature was observed.
Wachter-Jurcsak
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Department of Chemistry, Hofstra University, Hempstead, New York 11549, USA. Chmnwj@hofstra.edu
Detmer
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