Observation of the keto tautomer of D-fructose in D(2)O using (1)H NMR spectroscopy.
Observation of the keto tautomer of D-fructose in D(2)O using (1)H NMR spectroscopy.
复制标题
使用 (1) H NMR 光谱观察 D(2)O 中 D-果糖的酮互变异构体。
DOI:
10.1016/j.carres.2011.11.003
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发表时间:
2012-01-10
影响因子:
3.1
通讯作者:
Petrovsky, Nikolai
中科院分区:
文献类型:
--
作者:
Barclay, Thomas;Ginic-Markovic, Milena;Johnston, Martin R.;Cooper, Peter;Petrovsky, Nikolai
D-Fructose was analysed by NMR spectroscopy and previously unidentified 1H NMR resonances were assigned to the keto and α-pyranose tautomers. The full assignment of shifts for the various fructose tautomers enabled the use of 1H NMR spectroscopy in studies of the mutarotation (5 – 25 °C) and tautomeric composition at equilibrium (5 – 50 °C). The mutarotation of β-pyranose to furanose tautomers in D2O at a concentration of 0.18 M was found to have an activation energy of 62.6 kJ.mol−1. At tautomeric equilibrium (20 °C in D2O) the distribution of the β-pyranose, β-furanose, α-furanose, α-pyranose and the keto tautomers was found to be 68.23%, 22.35%, 6.24%, 2.67% and 0.50%, respectively. This tautomeric composition was not significantly affected by varying concentration between 0.089 and 0.36 M or acidification to pH 3. Upon equilibrating at 6 temperatures between 5 and 50 °C there was a linear relationship between the change in concentration and temperature for all forms.
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影响因子:
1
作者:
COCKMAN, M;KUBLER, DG;WILSON, L
通讯作者:
WILSON, L
影响因子:
15
作者:
GOUX, WJ
通讯作者:
GOUX, WJ
影响因子:
3.6
作者:
MEGA, TL;CORTES, S;VANETTEN, RL
通讯作者:
VANETTEN, RL
影响因子:
3.6
作者:
Gottlieb, HE;Kotlyar, V;Nudelman, A
通讯作者:
Nudelman, A
影响因子:
3.1
作者:
AVIGAD, G;ENGLARD, S;LISTOWSKY, I
通讯作者:
LISTOWSKY, I