SCHEDULED MAINTENANCE
Addition of norbornene derivatives to racemic mixtures of chiral tungsten–carbene complexes is shown to lead to the formation of transoid diastereoisomeric tungstacyclobutanes that can be distinguished by 1H n.m.r. spectroscopy; cisoid structures, though formed, are too unstable to be observed.
J. Kress, J. A. Osborn and K. J. Ivin, J. Chem. Soc., Chem. Commun., 1989, 1234 DOI: 10.1039/C39890001234
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