Conversion of nitroalkanes into carboxylic acids via iodide catalysis in water

2016 ◽  
Vol 52 (5) ◽  
pp. 1013-1016 ◽  
Author(s):  
Patricia Marcé ◽  
James Lynch ◽  
A. John Blacker ◽  
Jonathan M. J. Williams
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid

Carboxylic acids are prepared in good yields from nitroalkanes catalysed by a combination of a Lewis acid with iodide.

Lewis Acid Promoted Ruthenium(II)-Catalyzed Etherifications by Selective Hydrogenation of Carboxylic Acids/Esters

2015 ◽  
Vol 127 (17) ◽  
pp. 5285-5289 ◽  
Author(s):  
Yuehui Li ◽  
Christoph Topf ◽  
Xinjiang Cui ◽  
Kathrin Junge ◽  
Matthias Beller
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Selective Hydrogenation

scholarly journals Origin of Nb2 O5 Lewis Acid Catalysis for Activation of Carboxylic Acids in the Presence of a Hard Base

ChemPhysChem ◽  
2018 ◽  
Vol 19 (21) ◽  
pp. 2848-2857 ◽  
Author(s):  
Pussana Hirunsit ◽  
Takashi Toyao ◽  
S. M. A. Hakim Siddiki ◽  
Kenichi Shimizu ◽  
Masahiro Ehara
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Catalysis ◽  
Lewis Acid Catalysis

scholarly journals Ga/HZSM-5 Catalysed Acetic Acid Ketonisation for Upgrading of Biomass Pyrolysis Vapours

Catalysts ◽  
2019 ◽  
Vol 9 (10) ◽  
pp. 841 ◽  
Author(s):  
Hessam Jahangiri ◽  
Amin Osatiashtiani ◽  
Miloud Ouadi ◽  
Andreas Hornung ◽  
Adam F. Lee ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Carboxylic Acids ◽  
Lewis Acid ◽  
Energy Content ◽  
Vapour Phase ◽  
Acid Sites ◽  
Active Species ◽  
Biomass Pyrolysis ◽  
Lewis Acid Sites ◽  
Bio Oil

Pyrolysis bio-oils contain significant amounts of carboxylic acids which limit their utility as biofuels. Ketonisation of carboxylic acids within biomass pyrolysis vapours is a potential route to upgrade the energy content and stability of the resulting bio-oil condensate, but requires active, selective and coke-resistant solid acid catalysts. Here we explore the vapour phase ketonisation of acetic acid over Ga-doped HZSM-5. Weak Lewis acid sites were identified as the active species responsible for acetic acid ketonisation to acetone at 350 °C and 400 °C. Turnover frequencies were proportional to Ga loading, reaching ~6 min−1 at 400 °C for 10Ga/HZSM-5. Selectivity to the desired acetone product correlated with the weak:strong acid site ratio, being favoured over weak Lewis acid sites and reaching 30% for 10Ga/HZSM-5. Strong Brønsted acidity promoted competing unselective reactions and carbon laydown. 10Ga/HZSM-5 exhibited good stability for over 5 h on-stream acetic acid ketonisation.

Beyond ketonization: selective conversion of carboxylic acids to olefins over balanced Lewis acid–base pairs

2016 ◽  
Vol 52 (28) ◽  
pp. 4975-4978 ◽  
Author(s):  
Rebecca A. L. Baylon ◽  
Junming Sun ◽  
Kevin J. Martin ◽  
Padmesh Venkitasubramanian ◽  
Yong Wang
Keyword(s):  
Carboxylic Acids ◽  
Lewis Acid ◽  
Acid Base ◽  
Base Pairs ◽  
Selective Conversion

Balanced Lewis acid–base pairs can achieve cascade (cross) ketonization, (cross) aldolization, and self-deoxygenation reactions, converting carboxylic acids to C=3–C=6 olefins.

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