β-Diketone interactions Part 12. The structure and properties of 3-(3′,4′,5′- trimethylphenyl)-pentane-2,4-dione, C14H18O2; the hydrogen-bond energy of the enol tautomers of β-diketones
作者:John Emsley、Lewina Y.Y. Ma、Stanley C. Nyburg、Adrian W. Parkins
DOI:10.1016/0022-2860(90)80496-7
日期:1990.11
Abstract The X-ray crystal structure of 3-(3′,4′,5′-trimethylphenyl) pentane-2,4-dione shows it to be the enol tautomer, with a hydrogen bond length R O&…o of 2.460 A, and the enol ring remarkably symmetrical indicating a strong hydrogen bond. The hydrogen-bond energy is estimated to be 110±10 kJ mol −1 , a value derived from the infra-red spectrum. In CDCl 3 solutin 8% of the keto tautomer is present
摘要 3-(3',4',5'-trimethylphenyl)pentane-2,4-dione 的 X 射线晶体结构表明它是烯醇互变异构体,氢键长度 R O&…o 为 2.460 A,烯醇环非常对称,表明有很强的氢键。氢键能估计为 110±10 kJ mol -1 ,该值来自红外光谱。在CDCl 3 溶质中,存在8%的酮互变异构体。