Add time:08/25/2019         Source:sciencedirect.com

A new class of low-cost and easy-to-prepare monodentate phosphite ligands has been developed from readily accessible d-mannitol as starting material through a two-step transformation. Additionally, a simple and reliable protocol to synthesize neutral ruthenium phosphite complexes is reported. Four new [RuCl2(p-cymene)(L)] complexes were prepared by binding the desired phosphite ligands with [RuCl2(p-cymene)]2 individually in 89–96% isolated yield. The desired Ru-complex 1 revealed full conversion (100%) with good enantioselectivity (ee: 73%, 83% isolated yields) toward asymmetric hydrogenation of α,α,α-trifluoroacetophenone.

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