Abstract
An optimized route to enantiopure tetra-carboxylic acid and tetra-carboxamide bis(diazaphospholane) ligands that obviates chromatographic purification is presented. This synthesis, which is demonstrated on 15 and 100 g scales, features a scalable classical resolution of tetra-carboxylic acid enantiomers with recycling of the resolving agent. When paired with a rhodium metal center, these bis(diazaphospholane) ligands are highly active and selective in asymmetric hydroformylation applications.
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