Palladium-catalyzed asymmetric hydroesterification of α-methylstyrene by the use of chiral dibenzophospholes as ligands
✍ Scribed by Teruyuki Hayashi; Masato Tanaka; Ikuei Ogata
- Publisher
- Elsevier Science
- Year
- 1978
- Tongue
- French
- Weight
- 146 KB
- Volume
- 19
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Asymmetric carbonylation is a useful reaction for the syntheses of optically active carbonyl compounds some of which could be intermediates for medicines and perfumes. We have reported') that a diphosphine (Da) , analogous to (-)-Diop, which has the SH-dibenzophospholyl group (DBP) in place of the diphenylphosphino -
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## Abstract For Abstract see ChemInform Abstract in Full Text.
We have shown that cymantrene derivatives are better P,N-chelate ligands for palladium-catalyzed allylic alkylation than ferrocenes, which have a similar pentagonal ligand structure to cymantrene derivatives. In particular, the PPh 3 -substituted cymantrene gave a higher enantioselectivity (>98%).