Abstract
The reaction of the metallocene dichlorides Cp 2MCl 2 (Cp η 5-C 5H 5; M Ti, Zr, Hf, Mo, W) and Cp 2′TiCl 2 (Cp′ η 5-C 5H 4CH 3) with equimolar amounts of dilithium-benzene- o-diselenolate, 1,2-(LiSe) 2C 6H 4, gives the chelate complexes Cp 2M(Se 2C 6H 4) (M Ti (I), Zr (II), Hf (III), Mo (IV), W (V)) and Cp 2′Ti(Se 2C 6H 4) (VI). CpTiCl 3 reacts with 1,2-(LiSe) 2C 6H 4 to give CpTiCl(Se 2C 6H 4) (VII). The ring inversion activation parameters for I–VI can be determined by means of temperature-dependent 1H NMR spectroscopy in solution. The fragmentation behaviour of I–VII in the mass spectrometer has been investigated by pursuing metastable transitions, using linked-scan techniques.
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