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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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✍ Jae Hoon Lee; Seung Uk Son; Young Keun Chung 📂 Article 📅 2003 🏛 Elsevier Science 🌐 English ⚖ 243 KB

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%).