New Methods for the Synthesis of P-Chirogenic Diphosphines: An Application to the Development of an Improved Asymmetric Variation of the Rh(I)-Catalyzed [4 + 2] Cycloaddition

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Abstract
A series of new P-chirogenic diphosphines has been prepared by efficient and complementary synthetic procedures. The utilization of a series of these bidentate ligands possessing steric linker variations and a conserved P-chirogenic domain in an asymmetric variation of the Rh(I)-catalyzed [4 + 2] enediene cycloaddition is described.