Keto−enol tautomerization of 3-formylacetylacetone has been studied by NMR spectroscopy, ab initio, and DFT calculations in the gas phase and continuum solvation. By employing very low temperatures in a freonic solvent, tautomeric and conformational equilibria in the slow exchange regime were analyzed in detail. The β-tricarbonyl compound always adopts a structure with an enolized keto group irrespective
已通过NMR光谱,从头算和DFT计算在气相和连续溶剂化中研究了3-甲酰基
乙酰丙酮的酮-烯醇互变异构。通过在
氟利昂溶剂中使用非常低的温度,详细分析了慢交换过程中的互变异构和构象平衡。当降低
氟利昂混合物的温度时,与溶剂的介电常数增加无关,β-三羰基化合物总是采用带有烯化的酮基的结构。通过连续溶剂化DFT计算可以正确地再现这种实验观察到的3-甲酰基
乙酰丙酮的互变异构分布。