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Rhodium(III) complexes containing the ligand 2,6-bis[4′-( S)-isopropyloxazolin-2′-yl]pyridine (( S, S)- i Pr-pybox): Efficient catalysts for asymmetric hydrosilylation of acetophenone

Rhodium(III) complexes containing the ligand 2,6-bis[4′-( S)-isopropyloxazolin-2′-yl]pyridine (( S, S)- i Pr-pybox): Efficient catalysts for asymmetri

Rhodium(III) complexes containing the ligand 2,6-bis[4′-( S)-isopropyloxazolin-2′-yl]pyridine (( S, S)- i Pr-pybox): Efficient catalysts for asymmetric hydrosilylation of acetophenone   (Citations: 2)
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The dinuclear complexes [Rh2(μ-Cl)2(R)2{(S,S)-iPr-pybox}2][BF4]2 (R=(E)-C(Me)CH(Ph), C(Ph)CH2) have been synthesized by the reaction of the complexes trans-[RhCl2(R){(S,S)-iPr-pybox}] (R=(E)-C(Me)CH(Ph), C(Ph)CH2) with AgBF4. The rhodium(III) complexes cis-[RhCl2(R){(S,S)-iPr-pybox}] (R=COPh, CH2C(Me)CH2, CH2CHCH2, CH2CHCH(Ph), CHCCH2) and trans-[RhCl2{(E)-C(Me)CH(Ph)}{(S,S)-iPr-pybox}], recently reported, and the novel dinuclear complex [Rh2(μ-Cl)2{(E)-C(Me)CH(Ph)}2{(S,S)-iPr-pybox}2][BF4]2, exhibit high enantioselectivity in the hydrosilylation of acetophenone affording (S)-1-phenylethanol with high conversions and up to 89% ee. The species “RhCl{(S,S)-iPr-pybox}” is proposed as the real active rhodium catalyst and a pathway for its formation is also tentatively provided.
Journal: Journal of Molecular Catalysis A-chemical - J MOL CATAL A-CHEM , vol. 249, no. 1, pp. 60-64, 2006
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