Vanadocene and niobocene dihalides containing electron-withdrawing substituents in the cyclopentadienyl rings: Synthesis, characterization and cytotoxicity
2013
Abstract
The first example of the group V metallocene dihalides substituted in the cyclopentadienyl rings with electron-withdrawing substituents is reported. This study includes synthesis and spectroscopic characterization of the series of vanadocene and niobocene compounds functionalized in the cyclopentadienyl rings with the ester groups.
Structures of (eta(5)-C5H4COOPh)(2)VCl2, (eta(5)-C5H4COOMe)(2)VBr2 center dot CH2Cl2, (eta(5)-C5H4-COOPh)(2)NbCl2, (eta(5)-C5H4COOMe)(2)NbBr2 and (eta(5)-C5H4COOEt)(2)NbBr2 were determined by X-ray diffraction analysis. Cytotoxic activity toward human leukemia cells MOLT-4 was established in vitro for all newly prepared metallocene compounds.