Immobile without support: The first synthesis of chiral Al-bridged and Ti-bridged polymers by a metal-mediated self-assembly of (R,R)-6,6′-bi(binol) (binol=1,1′-bi-2-naphthol), which bears two pairs of phenolic hydroxy groups at the opposite sides in the molecule, is described (see scheme, X=OH or O). The polymers are found to promote asymmetric Michael reaction and carbonyl–ene reaction with high enantioselectivity and can be reused.
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