Volume 22, Issue 16
Organoelement Compounds
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ChemInform Abstract: Novel Chiral Water-Soluble Phosphines. Part 2. Applications in Catalytic Asymmetric Hydrogenation.

I. TOTH

I. TOTH

Dep. Chem., Va. Polytech. Inst., State Univ., Blacksburg, VA 24061, USA

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B. E. HANSON

B. E. HANSON

Dep. Chem., Va. Polytech. Inst., State Univ., Blacksburg, VA 24061, USA

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M. E. DAVIS

M. E. DAVIS

Dep. Chem., Va. Polytech. Inst., State Univ., Blacksburg, VA 24061, USA

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First published: April 23, 1991

Abstract

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ChemInform Abstract

Rhodium-diene complexes of the ligands (I)-(III) which are amine- functionalized derivatives of DIOP, BDPP and chiraphos, resp., are used for the asym. hydrogenation of the acids (IV). The presence of the -NMe2 groups in (I)-(III) enhances the rate of reaction and in the case of the DIOP derivative (I) causes a reversal in the observed dominant product antipode. This is attributed to a change in preferred ligand conformation. Protonated or methyl-quaternized rhodium-diene complexes of (I)-(III) are extremely water-soluble and easily recycled when used in two-phase applications.

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