The (aR,aR,uR) and (uS,aS,aS) enantiomers of a chiral macrobicyclic ligand with a bicapped tris(binaphtho1) structure were synthesized. Complexation of galliKeywords um(III), chromium(ni) and iron(1n) centres in the chiral cavities of these two ligands chirality * coordination modesyielded exclusively one octahedral configuration in each case: the (aR,aR,aR) enanmacrocyclic ligands -octahedral comtiomer gave a A complex and the (uS,aS,aS) enantiomer a A complex. These assignplexes * supramolecular chemistry ments were established by CD spectroscopy for chromium and iron centres and by molecular modelling.
A new type of metal colloid protected with chiral stabilizer may derive from another well-known heterogeneous enantioselective catalyst, the nickel/tartrdte system,[201 which is certainly a good candidate for the colloidal approach to catalytic enantioselectivity control. The ultimate research goal in this field, however, is to develop highly active nanostructured metal colloids protected by a new generation of chiral stabilizers providing efficient enantioselectivity control in the transformation of specific prochiral substrates into valuable fine chemicals. I
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.