Table 7.

Thermodynamic Data (kJ/mol) of Tautomeric Ketones and β-Diketones.

Compound	Keto Form ∆Hf Calc.	Enol Form ∆Hf Calc.	Experiment ∆Hf Exp	a	Ref.
1-(N-Phenylformimidoyl)-2-naphthol	70.23	46.53		+	[66]
Acetone	−243.18	−234.38	−248.1	+	[63]
Cyclohexanone	−281.24	−296.04	−276.1	−	[63]
Cyclopentanone	−233.35	−251.75	−240.2	−	[64]
Phenol	−57.50	−166.90	−165.2	+	[67]
2-Pyridone	−120.62	−136.32	−166.3	−	[68,69,70]
4-Pyridone	−98.82	−120.52	−148.9	+	[68,69,70]
Carbostyril	−74.43	−90.53	−144.9	−	[71,72,73]
Acetylacetone	−415.25	−429.25	−427.6	+	[65]
Bis(trifluoroacetyl)methane	−1659.98	−1676.28		+	[65]
Dibenzoylmethane	−203.72	−221.02		+	[65]
1,1-Bis(benzoyl)ethane	−231.31	−258.91		−	[65]

^a Conformance with experimental data.