Role of the planar chirality of imine–phosphine hybrid ligands bearing chromium tricarbonyl in the palladium-catalyzed asymmetric allylic alkylation
✍ Scribed by Hye-Young Jang; Hwimin Seo; Jin Wook Han; Young Keun Chung
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- French
- Weight
- 178 KB
- Volume
- 41
- Category
- Article
- ISSN
- 0040-4039
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✦ Synopsis
Optically active Cr-complexed imine±phosphine hybrid ligands having only a planar chirality showed excellent enantioselectivity for the palladium-catalyzed allylic alkylation with predictable absolute con®guration.
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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%).