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Unsaturated β-ketoesters and their Ni(II), Cu(II) and Zn(II) complexes

Ummathur Basheer Muhammed (Department of Chemistry, Unity Women's College, Manjeri, Kerala, India)
Krishnankutty Krishnannair (Department of Chemistry, University of Calicut, Kerala, India)
Balagopal Sindhu (Department of Chemistry, University of Calicut, Kerala, India)

A new series of β-ketoesters in which the keto group is attached to the olefinic linkage were synthesized by the reaction of methyl acetoacetate and aromatic aldehydes under specified conditions. The existence of these compounds predominantly in the intramolecularly hydrogen bonded enol form was well demonstrated from their IR, 1H-NMR and mass spectral data. Details on the formation of their [ML2] complexes with Ni(II), Cu(II) and Zn(II) and the nature of the bonding are discussed on the basis of analytical and spectral data.

Keywords: unsaturated β-ketoesters, metal complexes, IR, 1H-NMR, mass spectra