Poly , BINOL ligands

Fig. 16 BINOL ligands bearing dendritic poly(aryl ether) wedges...

Figure 4.10 Chiral poly(BINOL) (l,l -bi-2-naphthol) ligand for asymmetric addition of diethyl zinc to aldehydes.

In Lemaire s work, BINOL was used in place of resorcinol to prepare chiral bis(diarylalkylphosphite) end groups on poly(ethylene glycol). When this ligand 141 was combined with [Rh(cod)2]Bp4, a catalyst was obtained that exhibited thermoregulated behavior similar to that seen by Jin with other poly(alkene oxide)-boimd Rh catalysts. However, while high conversions in hydroformyla-tion were observed, the enantioselectivity for the hydroformylation of styrene by the Rh complex of this phosphite 141 was only modest (ca. 25% e.e.). 

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