Abstract
Two new aminophosphine ligands 4 and 5 with increased steric interaction in proximity to the N-coordination site have been prepared. Their asymmetric induction in five model reactions was tested and compared to results obtained with the parent ligand 2. This resulted in improved enantioselectivity in only one case, from 5 to 68% e.e., while in all the other cases the more crowded ligands exhibited significantly lower reactivity accompanied by decreased enantioselectivity.
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