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Synthesis and characterization of two unsaturated tetraketones and their metal complexes

Author(s): Saifunneesa Thelakkadan, Muhammed Basheer Ummathur, Krishnannair Krishnankutty

The reaction between terephthalaldehyde and acetylacetone under specified conditions yielded two types of unsaturated tetraketones in which the keto-groups are attached to olefinic linkages. The existence of one of the compound (H2L) in the intramolecularly hydrogen-bonded enol form and other (L) in the keto-form have been well demonstrated from their IR, 1H NMR and mass spectral data. Dibasic tetradentate coordination of H2L in its [M2L2] complexes and neutral bidentate coordination of L in its [ML(OAc)2] complexes [M = Ni(II) and Cu(II)] have been established on the basis of analytical and spectral data.

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