Vanadocene dichloride, dichloro bis(η5-cyclopentadienyl)vanadium(IV) is (η5-C5H5)2VCl2 (commonly abbreviated as Cp2VCl2). It is a structural analoque of titanocene dichloride but with vanadium(IV) instead of titanium(IV). This compound has one unpaired electron, hence Cp2VCl2 is paramagnetic. Vanadocene dichloride is a suitable precursor for variety of bis(cyclopentadienyl)vanadium(IV) compounds.
Reduction of vanadocene dichloride gives vanadocene (C5H5)2V.
Read more about Vanadocene Dichloride: Preparation, Structure