Ligands which open “upwards” and “downwards” cause the isomerism in the ZrII complexes 1 and 2. Depending on the conditions, successive treatment of Cp2ZrCl2 with allylMgCl and “butadiene-Mg” gives pure 1 or a mixture of 1 and 2. Irradiation of 1 at −40°C converts it almost quantitatively into 2, which isomerizes to 1 on heating.
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Erker et al. (1984) studied this question.
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