Effect of the conditions of preparation of asymmetric LaNi3Co2Hn catalysts on their hydrogenating and enantioselective properties

Starodubtseva, E. V.; Konenko, I. R.; Fedorovskaya, E.A.; Клабуновский, Е. И.; Mordovin, V. P.

doi:10.1007/bf00952616

Cited by 2 publications

(2 citation statements)

References 8 publications

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“…NaBr is known to be the most effective co-modifier for attaining a high enantioselectivity [37,46,63,74,76,80,[82][83][84]. The optimum amount of NaBr in the modification solution depends on the type of the base Ni [26,85], the modification pH [26], and the modification solvent [37].…”

Section: Role Of Nabr As a Co-modifiermentioning

confidence: 99%

Asymmetrically Modified Nickel Catalyst for the Enantio-Differentiating Hydrogenation of Prochiral Ketones

Osawa

Harada

Takayasu

2006

COC

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The state of the art for the enantio-differentiating hydrogenation over an asymmetrically modified nickel catalyst is reviewed along with the background development of the catalyst. An enantioselectivity up to 98% was obtained for the hydrogenation of β-functionalized ketones. The durability of the enantioselectivity was significantly improved using an in-situ-modified nickel powder catalyst (80-90% enantioselectivity for over 20 runs). Recent mechanistic investigations based on surface science are also summarized for the discussion of the enantio-differentiating model.

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Section: Role Of Nabr As a Co-modifiermentioning

confidence: 99%

Asymmetrically Modified Nickel Catalyst for the Enantio-Differentiating Hydrogenation of Prochiral Ketones

Osawa

Harada

Takayasu

2006

COC

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“…[21,[23][24][25][26][27][28][29]. For the in-situ-modification, tartaric acid and NaBr are added to the reaction media.…”

Section: Modification With Tartaric Acid and Nabrmentioning

confidence: 99%

Studies of the effects of the modification conditions on the hydrogenation rate for the enantio-differentiating hydrogenation of methyl acetoacetate over a tartaric acid–NaBr-modified nickel catalyst

et al. 2006

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The effects of the modification conditions on the hydrogenation rate and the enantio-differentiating ability (e.d.a.) for the enantio-differentiating hydrogenation of methyl acetoacetate were studied over an (R, R)-tartaric acid-NaBr-in-situ-modified nickel catalyst. It was revealed that a tartaric acid modification increased the hydrogenation rate irrespective of the presence of the auxiliary modifier, NaBr. In the presence of the tartaric acid, NaBr would have two roles, i.e., Na + activates the enantiodifferentiating sites through the interaction with tartaric acid, and Br ) deactivates both the enantio-differentiating sites and nonenantio-differentiating sites. The e.d.a. values and the hydrogenation rate would be determined by the combination of these effects of Na + and Br ) .

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Effect of the conditions of preparation of asymmetric LaNi3Co2Hn catalysts on their hydrogenating and enantioselective properties

Cited by 2 publications

References 8 publications

Asymmetrically Modified Nickel Catalyst for the Enantio-Differentiating Hydrogenation of Prochiral Ketones

Asymmetrically Modified Nickel Catalyst for the Enantio-Differentiating Hydrogenation of Prochiral Ketones

Studies of the effects of the modification conditions on the hydrogenation rate for the enantio-differentiating hydrogenation of methyl acetoacetate over a tartaric acid–NaBr-modified nickel catalyst

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