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Lyubimtsev A. V. Zheglova N. V. Smirnova E. N. Syrbu S. A. 《Russian Chemical Bulletin》2015,64(8):1933-1941
Russian Chemical Bulletin - A higher reactivity of 4-nitrophthalonitrile as compared to phthalonitrile and 4-amino-phthalonitrile in the reaction with sodium methoxide in methanol was demonstrated... 相似文献
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D. Kh. Zheglova D. G. Genov A. V. Gribanov A. I. Kol'tsov S. N. Smirnov 《Monatshefte für Chemie / Chemical Monthly》1994,125(12):1443-1446
Summary
1H,13C, and CP/MAS13C NMR spectra of sixp-substituted 1-aryl-3-arylamino-2-propen-1-ones in solution and in the solid state are reported and discussed. In the proteon-accepting solvent dimethylsulfoxide, electronegative substituents shift the isomeric equilibrium to the (E)-isomer. Bulky substituents promote crystallization of the (Z)-form.
NMR-Spektroskopische Untersuchung der (Z)/(E)-Isomerie von 1-Aryl-3-arylamino-2-propen-1-onen in Lösung und im Kristallzustand (Kurze Mitt.)
Zusammenfassung 1H-,13C- und CP/MAS-13C-NMR Spektren von sechsp-substituierten 1-Aryl-3-arylamino-2-propen-1-onen in gelöstem und festem Zustand werden berichtet und diskutiert. In protonenakzeptierendem Dimethylsulfoxid verschieben elektronegative Substituenten das Gleichgewicht zum (E)-Isomer. Große Substituenten begünstigen die Kristallisation in der (Z)-Form.相似文献
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The paper deals with a quantitative characterization of the influence of multiple intramolecular hydrogen bonds on the tautomeric equilibrium of 1,3-diketones by means of NMR-spectroscopy. The contents of the keto- and two enol forms of 1-(o-hydroxyphenyl) -1,3-butandione and 1-(o-methoxyphenyl)-1,3-butandione in tetrachloromethane, deuterochloroforme, acetone-d6 and acetonitrile-d3 are compared.The intramolecular hydrogen bond between the phenolic hydroxyl group and the aromatic carbonyl group in 1-(o-hydroxyphenyl)-1,3-butandione shifts are keto-enol equilibrium toward the keto-tautomer and enol-enol equilibrium toward the tautomer with an enolized aliphatic carbonyl group. 相似文献
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