4.8 Article

Ag+-assisted hydrosilylation:: Complementary behavior of Rh and Ir catalysts (reversal of enantioselectivity)

Journal

ORGANIC LETTERS
Volume 9, Issue 7, Pages 1371-1374

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/ol0702730

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The presence of a suitably situated hydroxy function in a PHOX ligand leads to an enhancement of the enantioselectivity in Rh-catalyzed hydrosilylations of prochiral ketones in the presence of AgBF4 (95% ee for acetophenone as compared to 75% using i-Pr-phosphinooxazoline (PHOX)). Exchanging Rh for Ir affords the product with the opposite absolute configuration (78% ee).

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