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Synthesis and characterization of two unsaturated tetraketones and their metal complexes

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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