Catalytic Enantioselective Aldol Reactions of Unprotected Carboxylic Acids under Phosphine Oxide Catalysis

2018 ◽  
Vol 57 (48) ◽  
pp. 15877-15881 ◽  
Author(s):  
Shunsuke Kotani ◽  
Yusaku Yoshiwara ◽  
Masamichi Ogasawara ◽  
Masaharu Sugiura ◽  
Makoto Nakajima
Keyword(s):  
Carboxylic Acids ◽  
Phosphine Oxide ◽  
Aldol Reactions ◽  
Oxide Catalysis

Catalytic Enantioselective Aldol Reactions of Unprotected Carboxylic Acids under Phosphine Oxide Catalysis

2018 ◽  
Vol 130 (48) ◽  
pp. 16103-16107
Author(s):  
Shunsuke Kotani ◽  
Yusaku Yoshiwara ◽  
Masamichi Ogasawara ◽  
Masaharu Sugiura ◽  
Makoto Nakajima
Keyword(s):  
Carboxylic Acids ◽  
Phosphine Oxide ◽  
Aldol Reactions ◽  
Oxide Catalysis

scholarly journals Poly(methylhydrosiloxane) as a green reducing agent in organophosphorus-catalysed amide bond formation

2017 ◽  
Vol 15 (30) ◽  
pp. 6426-6432 ◽  
Author(s):  
Daan F. J. Hamstra ◽  
Danny C. Lenstra ◽  
Tjeu J. Koenders ◽  
Floris P. J. T. Rutjes ◽  
Jasmin Mecinović
Keyword(s):  
Carboxylic Acids ◽  
Phosphine Oxide ◽  
Bond Formation ◽  
Reducing Agent ◽  
Amide Bond ◽  
Amide Bond Formation ◽  
Amidation Reaction

In situ reduction of phosphine oxide by poly(methylhydrosiloxane) leads to efficient amidation reaction between carboxylic acids and amines.

scholarly journals Ru-(Mn-M)OX Solid Base Catalysts for the Upgrading of Xylitol to Glycols in Water

Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 331 ◽  
Author(s):  
Maxime Rivière ◽  
Noémie Perret ◽  
Damien Delcroix ◽  
Amandine Cabiac ◽  
Catherine Pinel ◽  
...  
Keyword(s):  
Ethylene Glycol ◽  
Propylene Glycol ◽  
Carboxylic Acids ◽  
Aldol Reactions ◽  
Solid Base ◽  
Solid Base Catalysts ◽  
Base Catalysts ◽  
Highly Dispersed ◽  
Co Precipitation

A series of Ru-(Mn-M)OX catalysts (M: Al, Ti, Zr, Zn) prepared by co-precipitation were investigated in the hydrogenolysis of xylitol in water to ethylene glycol, propylene glycol and glycerol at 200 °C and 60 bar of H2. The catalyst promoted with Al, Ru-(Mn-Al)OX, showed superior activity (57 h−1) and a high global selectivity to glycols and glycerol of 58% at 80% xylitol conversion. In comparison, the catalyst prepared by loading Ru on (Mn-Al)OX, Ru/(Mn-Al)OX was more active (111 h−1) but less selective (37%) than Ru-(Mn-Al)OX. Characterization of these catalysts by XRD, BET, CO2-TPD, NH3-TPD and TEM showed that Ru/(Mn-Al)OX contained highly dispersed and uniformly distributed Ru particles and fewer basic sites, which favored decarbonylation, epimerization and cascade decarbonylation reactions instead of retro-aldol reactions producing glycols. The hydrothermal stability of Ru-(Mn-Al)OX was improved by decreasing the xylitol/catalyst ratio, which decreased the formation of carboxylic acids and enabled recycling of the catalyst, with a very low deactivation.

Enantioselective Aldol Reactions of Trichlorosilyl Enol Ethers Catalyzed by the Chiral Phosphine Oxide BINAPO

Synlett ◽  
2006 ◽  
Vol 2006 (07) ◽  
pp. 1116-1118 ◽  
Author(s):  
Makoto Nakajima ◽  
Shunsuke Kotani ◽  
Shunichi Hashimoto
Keyword(s):  
Phosphine Oxide ◽  
Aldol Reactions ◽  
Enol Ethers

Phosphine‐oxide‐catalyzed Enantioselective Cross‐aldol Reactions of Aldehydes with Trichlorosilane as Lewis Acid Promoter

ChemCatChem ◽  
2020 ◽  
Vol 12 (19) ◽  
pp. 4780-4783
Author(s):  
Shunsuke Kotani ◽  
Takuya Hanamure ◽  
Yoshiki Mori ◽  
Makoto Nakajima
Keyword(s):  
Lewis Acid ◽  
Phosphine Oxide ◽  
Aldol Reactions

Enantioselective Aldol Reactions of Trichlorosilyl Enol Ethers Catalyzed by the Chiral Phosphine Oxide BINAPO.

ChemInform ◽  
2006 ◽  
Vol 37 (36) ◽  
Author(s):  
Shunsuke Kotani ◽  
Shunichi Hashimoto ◽  
Makoto Nakajima
Keyword(s):  
Phosphine Oxide ◽  
Aldol Reactions ◽  
Enol Ethers

Recent advances in asymmetric phosphine oxide catalysis

2020 ◽  
Vol 61 (4) ◽  
pp. 151421 ◽  
Author(s):  
Shunsuke Kotani ◽  
Makoto Nakajima
Keyword(s):  
Phosphine Oxide ◽  
Recent Advances ◽  
Oxide Catalysis
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