scholarly journals Catalytic upgrading of α-angelica lactone to levulinic acid esters under mild conditions over heterogeneous catalysts

2015 ◽  
Vol 5 (12) ◽  
pp. 5168-5173 ◽  
Author(s):  
Mohammad G. Al-Shaal ◽  
Wirawan Ciptonugroho ◽  
Fabian J. Holzhäuser ◽  
Joel B. Mensah ◽  
Peter J. C. Hausoul ◽  
...  
Keyword(s):  
Levulinic Acid ◽  
Heterogeneous Catalysts ◽  
Catalytic Upgrading ◽  
Mild Conditions ◽  
Angelica Lactone ◽  
Acid Esters

α-Angelica lactone was identified as a better candidate than levulinic acid for the heterogeneously catalysed preparation of levulinic acid esters.

Microwave-Assisted Decarbonylation of Biomass-Derived Aldehydes Using Pd-Doped Hydrotalcites

2019 ◽  
Author(s):  
Nan An ◽  
Diana Ainembabazi ◽  
Kavya Samudrala ◽  
Christopher Reid ◽  
Kare Wilson ◽  
...  
Keyword(s):  
Heterogeneous Catalysts ◽  
Reaction Times ◽  
Inverse Correlation ◽  
Mulliken Charge ◽  
Metal Leaching ◽  
Carbonyl Carbon ◽  
Mild Conditions ◽  
Microwave Assisted ◽  
Biomass Processing ◽  
Alcohol Dehydrogenation

<p>Here we report the synthesis, characterization and activity of tunable Pd-doped hydrotalcites (Pd-HTs) for the decarbonylation of furfural, hydroxymethylfurfural (HMF), aromatic and aliphatic aldehydes under microwave conditions. The decarbonylation activity reported is a notable improvement over prior heterogeneous catalysts for this process. Furfural decarbonylation is optimized in a benign solvent compatible with biomass processing - ethanol, under relatively mild conditions and short reaction times. HMF selectively affords excellent yields of furfuryl alcohol with no humin formation, but longer reaction can also afford furan via tandem alcohol dehydrogenation and decarbonylation. Yields of substituted benzaldehydes are related to calculated Mulliken charge of the carbonyl carbon. The activity and selectivity differences can be traced to loading-dependent differences in Pd speciation on the catalysts. Poisoning studies show inverse correlation between Pd loading and metal leaching: Pd-HTs with lowest Pd loading, which consist of highly dispersed and oxidized Pd species, operate heterogeneously with negligible metal leaching. Recycling experiments are consistent with this trend, offering potential for further optimization to improve robustness.</p>

Conversion of levulinic acid to levulinate ester biofuels by heterogeneous catalysts in the presence of acetals and ketals

2021 ◽  
Vol 293 ◽  
pp. 120219
Author(s):  
Dawn R. Chaffey ◽  
Takudzwa Bere ◽  
Thomas E. Davies ◽  
David C. Apperley ◽  
Stuart H. Taylor ◽  
...  
Keyword(s):  
Levulinic Acid ◽  
Heterogeneous Catalysts

scholarly journals Synthesis of Furandicarboxylic Acid Esters From Nonfood Feedstocks Without Concomitant Levulinic Acid Formation

ChemSusChem ◽  
2017 ◽  
Vol 10 (7) ◽  
pp. 1460-1468 ◽  
Author(s):  
Frits van der Klis ◽  
Jacco van Haveren ◽  
Daan S. van Es ◽  
Johannes H. Bitter
Keyword(s):  
Levulinic Acid ◽  
Acid Formation ◽  
Furandicarboxylic Acid ◽  
Acid Esters

ChemInform Abstract: A SYNTHESIS OF N-PHTHALOYL AMINO ACIDS AND AMINO ACID ESTERS UNDER MILD CONDITIONS

1973 ◽  
Vol 4 (40) ◽  
pp. no-no
Author(s):  
D. A. HOOGWATER ◽  
D. N. REINHOUDT ◽  
T. S. LIE ◽  
J. J. GUNNEWEG ◽  
H. C. BEYERMAN
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Amino Acid Esters ◽  
Mild Conditions ◽  
Acid Esters

Dicarboxylic acid esters from the carbonylation of unsaturated esters under mild conditions

2005 ◽  
Vol 8 (10) ◽  
pp. 878-881 ◽  
Author(s):  
Cristina Jiménez-Rodriguez ◽  
Graham R. Eastham ◽  
David J. Cole-Hamilton
Keyword(s):  
Dicarboxylic Acid ◽  
Unsaturated Esters ◽  
Mild Conditions ◽  
Acid Esters

Guanylation/cyclisation of amino acid esters using an imidazolin-2-iminato titanium initiator

2019 ◽  
Vol 48 (21) ◽  
pp. 7227-7235 ◽  
Author(s):  
Suman Das ◽  
Jayeeta Bhattacharjee ◽  
Tarun K. Panda
Keyword(s):  
Amino Acid ◽  
Amino Acid Esters ◽  
Urea Derivatives ◽  
Mild Conditions ◽  
Acid Esters

Catalytic hydroamination of amino acid esters with carbodiimides and isocyanates to furnish corresponding quinazolinone and urea derivatives using two TiIV complexes under mild conditions is reported.

Renewable platform chemicals: Thermochemical study of levulinic acid esters

2018 ◽  
Vol 659 ◽  
pp. 213-221 ◽  
Author(s):  
Vladimir N. Emel’yanenko ◽  
Emrah Altuntepe ◽  
Christoph Held ◽  
Andrey A. Pimerzin ◽  
Sergey P. Verevkin
Keyword(s):  
Levulinic Acid ◽  
Thermochemical Study ◽  
Platform Chemicals ◽  
Acid Esters

scholarly journals Low Temperature Chemoselective Hydrogenation of Aldehydes over a Magnetic Pd Catalyst

2019 ◽  
Vol 9 (9) ◽  
pp. 1792
Author(s):  
Liu ◽  
Wang ◽  
Gao ◽  
Wang ◽  
Cheng ◽  
...  
Keyword(s):  
Low Temperature ◽  
Room Temperature ◽  
Heterogeneous Catalysts ◽  
Aromatic Aldehydes ◽  
Pd Catalyst ◽  
Primary Alcohols ◽  
Mild Conditions ◽  
Excellent Yield ◽  
Chemoselective Hydrogenation ◽  
Supported Palladium

Chemoselective hydrogenation of aldehydes with heterogeneous catalysts under mild conditions is of great importance but remains a major challenge. Herein, an efficient strategy was developed for low temperature chemoselective hydrogenation of aldehydes with broad substrate scope over a magnetic material supported palladium catalyst (γ-Fe2O3@HAP-Pd). Aldehydes bearing various reducible functional groups readily underwent hydrogenation to give the corresponding primary alcohols with moderate to excellent yield at room temperature in aqueous solutions. The Hammett equation revealed that the hydrogenation of aromatic aldehydes proceeded via an anionic intermediate. Additionally, when the temperature increased to 70 °C, toluene was obtained by the deoxygenation of benzaldehyde in excellent yield. Furthermore, the γ-Fe2O3@HAP-Pd could be recycled up to six times without loss of activity and metal leaching.

Chemical fixation of carbon dioxide catalyzed via covalent triazine frameworks as metal free heterogeneous catalysts without a cocatalyst

2019 ◽  
Vol 7 (45) ◽  
pp. 26071-26076 ◽  
Author(s):  
Yi-Meng Li ◽  
Li Yang ◽  
Lei Sun ◽  
Lei Ma ◽  
Wei-Qiao Deng ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Heterogeneous Catalysts ◽  
Chemical Fixation ◽  
Co Catalyst ◽  
Metal Free ◽  
Mild Conditions ◽  
Fixation Of Carbon Dioxide

2,5-DCP-CTF performs as an efficient metal-free catalyst in the chemical fixation of CO2 under mild conditions without the employment of any co-catalyst.

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