Various neutral, mono- and dicationic halogen bond donors were screened for their ability to act as catalysts in a Nazarov cyclisation reaction. Using a highly preorganized dicationic catalyst with a noncoordinating counterion proved essential for high activity.
A. Dreger, P. Wonner, E. Engelage, S. M. Walter, R. Stoll and S. M. Huber, Chem. Commun., 2019, 55, 8262 DOI: 10.1039/C9CC02816A
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