Is the question of catalytically active species for Sharpless epoxidations again open? The results of NMR spectroscopy and X-ray structural analysis on catalytically inactive (tartrato)zirconocene dimers show how complicated the situation can be. Simple stereochemical changes and variation of the substituents in the crystal and in solution result in these complexes forming either ten-membered dimetallacycles (type A) or dimetallatricycles (type B). E = CO2CHMe2, CO2Me.
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Erker et al. (1991) studied this question.
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