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Abstract: The synthesis of four new di-n-butyl[bis{dimethyl-2-(3-oxo-5-phenyl(4-subtituted)penten-5-ato)malonates}]tin(IV) 2a–2d is reported. These complexes have been characterized by 1H, 13C, 119Sn NMR, HMQC, HMBC, infrared spectroscopy and mass spectrometry (FAB). Their structures in CDCl3 solution show a distorted octahedral geometry with a trans disposition of the n-butyl substituents. The 119Sn NMR study at low variable-temperature indicates the presence of trans anti- and syn-isomers, and solid-state 13C and 119Sn NMR spectra of compound 2d give also evidence of the mixture of trans isomers. The X-ray diffraction study of compound 2d at 168K shows only the trans syn-isomer, where the metal is six-coordinated in a skewed trapezoidal bipyramidal (STB) geometry. [Copyright &y& Elsevier]

The synthesis of four new di-n-butylhydroxytin(IV) derivatives obtained from 1,3-diketone malonates 2a–2d is reported. All compounds were characterized by 1H, 13C, 119Sn NMR, infrared spectroscopy and mass spectrometry (FAB). The 119Sn NMR spectra at room temperature showed that in CDCl3 solution the tin atom is hexacoordinated. Moreover, the 119Sn NMR spectra of compound 2a at low temperature exhibits two signals in the range of hexacoordinated compounds, suggesting the existence of additional species in higher states of aggregation. [Copyright &y& Elsevier]