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Table 1 Chemical shifts for enolic H-atom and carbonyl carbon atom in cis keto-enol form of compounds 2, 3 and 4 in CDCl 3 solution

From: Structures in solid state and solution of dimethoxy curcuminoids: regioselective bromination and chlorination

Comp. δ(OH) δ(CO) Comp. δ(OH) δ(CO) Comp. δ(OH) δ(CO)
2a 15.91 183.6 3a 16.41 180.5 4a 16.86 181.3
2b 16.19 183.8 3b 16.78 180.6 4b 17.21 181.5
2c 15.96 183.6 3c 16.52 180.5 4c 16.96 181.4
2d 16.23 184.7 3d 16.77 181.6 4d 17.19 182.4
2e 16.02 183.2 3e 16.62 180.1 4e 17.05 181.0
2f 15.83 183.2 3f 16.34 180.1 4f 16.74 181.0