Table 2.

β-Diketones with aromatic and heteroaromatic substituents. Solvent CDCl₃. Percentage of enol-form ^a.

R1 b	R2	% Enol	Reference
CH3	2-Thiophene	84, 94.4	[26,27]
C3F7	2-Thiophene	100	[28]
2-Thiophene	2-Thiophene	82	[26,27]
Ph	2-Thiophene	94.3, 92.8	[27]
CF3	2-Thiophene	94.4	[26]
Ph	2-Furane	95.5	[27]

^a See also Table 3 and the paper by Sloop et al. above [19]. ^b R₁ and R₂ refer to Figure 1.