Reactions of ferrocenecarboxaldehyde with compounds containing active methylene group in aqueous solution

Ferrocenylmethylene containing ketones were achieved by the reactions of ferrocenecarboxaldehyde with compounds containing active methylene group, such as barbituric acid (2a), thiobarbituric acid (2b), 2,2-dimethyl-1, 3-dioxane-4, 6-dione (2c), 3-methyl-1-phenyl-2-pyrazoline-5-one (2d), ethyl cyarroacetate (2e), 2,4-pentandione (2f), cyclohexanone (2g) and cyclopentanone (2h) in aqueous solution with good yields. The structures of products were confirmed by H-1 NMR, C-13 NMR, IR spectra and elemental analysis.