13.1Enolsandenolateions（烯醇和烯醇负离子）OHB:O - O H HB HO+B Resonance-stabilizedanionKetoform(酮式，Stable)烯醇阴离子，Enolateion OHH+HOHHOH-H+ Enolform(烯醇式，unstable)HO Resonance-stabilizedcationKetoform(酮式，Stable)Enolform(烯醇式，unstable)Ketoandenoltautomers(酮和烯醇互变异构体）Ke...
Owing to the ICT effect from electronic donor to acceptor, introducing TPA into the side of oxazole and TPB into the para-position of phenolic hydroxyl is conducive to an enol-form emission (6a). Exchanging the two substituents, namely introducing TPB into the side of oxazole and TPA into ...
ketohexose- a monosaccharide having six carbon atoms and a ketone group monosaccharide,monosaccharose,simple sugar- a sugar (like sucrose or fructose) that does not hydrolyse to give other sugars; the simplest group of carbohydrates Based on WordNet 3.0, Farlex clipart collection. © 2003-2012...
Chapter 13 α-Substitution and Condensations of Enols and Enolate Enols and enolate ions (烯醇和烯醇负离子)Enol form(烯醇式,unstable)Resonance-stabilized anion烯醇阴离子,Enolate ionKeto form(酮式,Stable)Keto form(酮式, Stable)Enol form(烯醇式, unstable)Resonance-stabilized cationKeto and enol ...
1.The characteristics of these compounds and their keto-enol tautomeric phenomena were investigated by ESI MS,UV,IR and 1H NMR spectroscopy.合成了5种不同结构的β-二酮化合物,采用电喷雾质谱、紫外光谱、红外光谱和核磁共振法对其结构进行表征,并讨论了它们的酮式-烯醇式互变异构现象。 2)Keto form enol...
the azo form always predominates; substitution of diazonium salt and at N3 nitrogen does not significantly affect the position of the tautomeric equilibrium... ?im?nek, Petr,M Svobodov?,V Bertolasi,... - 《New Journal of Chemistry》 被引量: 43发表: 2007年 Keto-enol tautomeric equilibrium...
For the case of the keto forms, pulse radiolysis experiments have revealed the existence of a triplet acceptor (from energy transfer from different donors) for the indigo, purple, and indirubin compounds. It is shown that with the keto form the major deactivation pathway involves internal ...
The predictions of electronic structure calculations by B3LYP/6-311++G(d,p) and MP2/cc-pVTZ methods are found to be consistent with the measured tautomeric distribution in the cold inert gas matrix. The larger dipole moment of the diketo tautomer (5.61 D) compared to enol form (3.60 D) ...
keto form (ˈkiːtəʊ) n (Chemistry) the form of tautomeric compounds when they are ketones rather than enols. Seeketo-enol tautomerism Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009...
Combining this with pKT gives pKaEH 8.15 for the enol form of 2PAT. Comparison of these values with those previously reported for 2-phenylacetylfuran and deoxybenzoin shows a significant influence of both five-membered heterocyclic rings (a) in increasing the acidity of the enol and (b) in ...