Synthesis and structure determination of bis(1,3-di-tert-butylcyclopentadienyl)(divinyl)hafnium

The reaction of (t-Bu2C5H3)2HfCl2 (1) with vinyllithium yield ivory coloured crystals identified as (t-Bu2C5H3)2Hf(CHCH2)2 (2). The X-ray structure analysis of 2 shows the presence of the divinyl complex, whereby one of the vinyl groups is partially replaced by chlorine (25%).