Gold Promotion of MCM-41 Supported Ruthenium Catalysts for Selective Hydrogenation of α,β-Unsaturated Aldehydes and Ketones

2017 ◽  
Vol 148 (1) ◽  
pp. 267-276 ◽  
Author(s):  
Rongrong Li ◽  
Jia Zhao ◽  
Zhixing Gan ◽  
Wenping Jia ◽  
Chenglin Wu ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Ruthenium Catalysts ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
Mcm 41

scholarly journals Thermoregulated phase-separable rhodium nanoparticle catalyst for selective hydrogenation of α,β-unsaturated aldehydes and ketones

RSC Advances ◽  
2017 ◽  
Vol 7 (79) ◽  
pp. 50343-50346 ◽  
Author(s):  
Xiuru Xue ◽  
Mingming Niu ◽  
Yicheng Xu ◽  
Yanhua Wang
Keyword(s):  
Selective Hydrogenation ◽  
Unsaturated Aldehydes ◽  
Highly Efficient ◽  
Aldehydes And Ketones ◽  
Rhodium Nanoparticle ◽  
Nanoparticle Catalyst

Highly efficient and recyclable thermoregulated phase-separable Rhnano catalysts applied for the selective hydrogenation of α,β-unsaturated aldehydes and ketones are presented.

Thermoregulated phase-transfer iridium nanoparticle catalyst: highly selective hydrogenation of the CO bond for α,β-unsaturated aldehydes and the CC bond for α,β-unsaturated ketones

2016 ◽  
Vol 6 (20) ◽  
pp. 7386-7390 ◽  
Author(s):  
Wenjiang Li ◽  
Yanhua Wang ◽  
Pu Chen ◽  
Min Zeng ◽  
Jingyang Jiang ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Phase Transfer ◽  
Unsaturated Ketones ◽  
Iridium Nanoparticles ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
Nanoparticle Catalyst

Thermoregulated phase-transfer iridium nanoparticles exhibited a totally different hydrogenation orientation for α,β-unsaturated aldehydes and ketones.

Selective Hydrogenation of α,β-Unsaturated Aldehydes and Ketones by Air-Stable Ruthenium NNS Complexes

2017 ◽  
Vol 23 (35) ◽  
pp. 8473-8481 ◽  
Author(s):  
Pim Puylaert ◽  
Richard van Heck ◽  
Yuting Fan ◽  
Anke Spannenberg ◽  
Wolfgang Baumann ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones

Selective hydrogenation of the CC bond in α,β-unsaturated aldehydes and ketones over ultra-small Pd–Au clusters

Nanoscale ◽  
2016 ◽  
Vol 8 (44) ◽  
pp. 18626-18629 ◽  
Author(s):  
Yifei Zhang ◽  
Xiujuan Yang ◽  
Yan Zhou ◽  
Gao Li ◽  
Zhimin Li ◽  
...  
Keyword(s):  
Selective Hydrogenation ◽  
Unsaturated Aldehydes ◽  
Au Clusters ◽  
Aldehydes And Ketones

scholarly journals Theoretical Insight into the Reversal of Chemoselectivity in Diels-Alder Reactions of α,β-Unsaturated Aldehydes and Ketones Catalyzed by Brønsted and Lewis Acids

Organics ◽  
2021 ◽  
Vol 2 (1) ◽  
pp. 38-49
Author(s):  
Lakhdar Benhamed ◽  
Sidi Mohamed Mekelleche ◽  
Wafaa Benchouk
Keyword(s):  
Lewis Acids ◽  
Major Product ◽  
Diels Alder ◽  
Unsaturated Ketone ◽  
Unsaturated Aldehydes ◽  
Aldehydes And Ketones ◽  
Theoretical Insight ◽  
Insight Into ◽  
Good Agreement

Experimentally, a reversal of chemoselectivity has been observed in catalyzed Diels–Alder reactions of α,β-unsaturated aldehydes (e.g., (2E)-but-2-enal) and ketones (e.g., 2-hexen-4-one) with cyclopentadiene. Indeed, using the triflimidic Brønsted acid Tf2NH as catalyst, the reaction gave a Diels–Alder adduct derived from α,β-unsaturated ketone as a major product. On the other hand, the use of tris(pentafluorophenyl)borane B(C6F5)3 bulky Lewis acid as catalyst gave mainly the cycloadduct of α,β-unsaturated aldehyde as a major product. Our aim in the present work is to put in evidence the role of the catalyst in the reversal of the chemoselectivity of the catalyzed Diels–Alder reactions of (2E)-but-2-enal and 2-Hexen-4-one with cyclopentadiene. The calculations were performed at the ωB97XD/6-311G(d,p) level of theory and the solvent effects of dichloromethane were taken into account using the PCM solvation model. The obtained results are in good agreement with experimental outcomes.

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