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- W2023725338 abstract "AbstractHydroformylation of vinylarenes is performed using rhodium precursors with various P,N-donor chiral 4-diphenyl-phosphanyl-1-(dialkylamino)butane ligands (8a–d) with DIOP backbone. The systems were active at mild conditions andthe selectivity in aldehydes was total when mixtures of CO/H 2 at a ratio 1/1 were used. The maximum regioselectivity inthe branched products was 95%. The highest ee was 23%. NMR studies under catalytic conditions showed that species withmonodentate ligands were present in the catalytic solution. © 2002 Published by Elsevier Science B.V. Keywords: Rhodium; Hydroformylation; P,N-ligands; Asymmetric catalysis 1. IntroductionChiral diphosphines based on DIOP backbone [1](1) (Fig. 1) have been widely applied in homoge-neous catalysis. As these ligands are easy and cheapto prepare from tartaric acid, they have been oftenmodified for different purposes. Since Rh/ 1 systemswere first used in the asymmetric hydroformylationof styrene derivatives [2], several substituents havebeen introduced into the phosphorus atom or intothe dioxolan ring to improve optical induction or toallow the separation of the catalyst. For example, inthe asymmetric hydroformylation of styrene usingplatinum complexes, the enantioselectivity obtained" @default.
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- W2023725338 date "2002-06-01" @default.
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- W2023725338 title "Rhodium-catalysed asymmetric hydroformylation of vinylarenes with chiral P,N-ligands based on DIOP skeleton" @default.
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