%0 Journal Article %A Zhang Benli %A Zhuo Jincong %A Gui Mingde %A Gao Zhenheng %T Study on Intramolecular Hydrogen-Bonding and Keto-Enol Tautomerism of Some Asymmetrical β-Diketones by1H NMR %D 1990 %R %J Chemical Journal of Chinese Universities %P 376-379 %V 11 %N 4 %X The intramolecular hydrogen-bonding and keto-enol tautomerism of a series of 1-aryl-3-tolyl-1,3-propanediones were studied by 1H NMR. Both δOHand lgK(K=[enol]/[keto]) can be correlated with substituent constants satisfactorily. +1 and +Rsubstituents enhance the hydrogenbond-ing and decrease the content of enol form. %U http://www.cjcu.jlu.edu.cn/EN/abstract/article_11252.shtml