Gas–solid conversion of lignin to carboxylic acids

2016 ◽  
Vol 1 (4) ◽  
pp. 397-408 ◽  
Author(s):  
Samira Lotfi ◽  
Daria C. Boffito ◽  
Gregory S. Patience
Keyword(s):  
Carboxylic Acids ◽  
Chemical Processes ◽  
Aliphatic Carboxylic Acids ◽  
Oxidative Catalysis

We combine thermo-chemical processes with oxidative catalysis to convert lignin to aliphatic carboxylic acids mainly C4 acids. Acid selectivity changed with catalyst.

Generation of Phosphoranyl Radicals via Photoredox Catalysis Enables Voltage–Independent Activation of Strong C–O Bonds

2018 ◽  
Author(s):  
Erin Stache ◽  
Alyssa B. Ertel ◽  
Tomislav Rovis ◽  
Abigail G. Doyle
Keyword(s):  
Carboxylic Acids ◽  
Functional Groups ◽  
Single Step ◽  
Direct Access ◽  
Photoredox Catalysis ◽  
Acyl Radical ◽  
Synthetic Strategy ◽  
Acyl Radicals ◽  
Benzyl Radicals ◽  
Aliphatic Carboxylic Acids

Alcohols and carboxylic acids are ubiquitous functional groups found in organic molecules that could serve as radical precursors, but C–O bonds remain difficult to activate. We report a synthetic strategy for direct access to both alkyl and acyl radicals from these ubiquitous functional groups via photoredox catalysis. This method exploits the unique reactivity of phosphoranyl radicals, generated from a polar/SET crossover between a phosphine radical cation and an oxygen centered nucleophile. We first show the desired reactivity in the reduction of benzylic alcohols to the corresponding benzyl radicals with terminal H-atom trapping to afford the deoxygenated product. Using the same method, we demonstrate access to synthetically versatile acyl radicals which enables the reduction of aromatic and aliphatic carboxylic acids to the corresponding aldehydes with exceptional chemoselectivity. This protocol also transforms carboxylic acids to heterocycles and cyclic ketones via intramolecular acyl radical cyclizations to forge new C–O, C–N and C–C bonds in a single step.

Improved QSAR Analysis of the Toxicity of Aliphatic Carboxylic Acids

2003 ◽  
Vol 73 (11) ◽  
pp. 1792-1798 ◽  
Author(s):  
F. P. Maguna ◽  
M. B. Ninez ◽  
N. B. Okulik ◽  
E. A. Castro
Keyword(s):  
Carboxylic Acids ◽  
Qsar Analysis ◽  
Aliphatic Carboxylic Acids

Radical addition to acrylonitrile via catalytic photochemical decarboxylation of aliphatic carboxylic acids

2013 ◽  
Vol 54 (32) ◽  
pp. 4324-4326 ◽  
Author(s):  
Yasuharu Yoshimi ◽  
Sonoka Washida ◽  
Yoshiki Okita ◽  
Keisuke Nishikawa ◽  
Kousuke Maeda ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Radical Addition ◽  
Aliphatic Carboxylic Acids

Syntheses, structures, and properties of multidimensional lithium coordination polymers based on aliphatic carboxylic acids

2013 ◽  
Vol 42 (8) ◽  
pp. 2765-2772 ◽  
Author(s):  
Pei-Chi Cheng ◽  
Wei-Cheng Lin ◽  
Feng-Shuen Tseng ◽  
Ching-Che Kao ◽  
Ting-Guang Chang ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Coordination Polymers ◽  
Structures And Properties ◽  
Aliphatic Carboxylic Acids

ChemInform Abstract: Silver-Catalyzed Decarboxylative Trifluoromethylthiolation of Aliphatic Carboxylic Acids in Aqueous Emulsion.

ChemInform ◽  
2014 ◽  
Vol 45 (49) ◽  
pp. no-no
Author(s):  
Feng Hu ◽  
Xinxin Shao ◽  
Dianhu Zhu ◽  
Long Lu ◽  
Qilong Shen
Keyword(s):  
Carboxylic Acids ◽  
Aqueous Emulsion ◽  
Aliphatic Carboxylic Acids

QSTR mathematical models for the toxicity of aliphatic carboxylic acids on tetrahymena pyriformis

2013 ◽  
Vol 22 (2) ◽  
Author(s):  
Zoița Mărioara Berinde
Keyword(s):  
Dissociation Constant ◽  
Carboxylic Acids ◽  
Aquatic Toxicity ◽  
Tetrahymena Pyriformis ◽  
Refraction Index ◽  
Linear Regression Models ◽  
Acidic Dissociation ◽  
Growth Assay ◽  
Aliphatic Carboxylic Acids ◽  
Acidic Dissociation Constant

The present work represents an attempt to improve QSTR models for aquatic toxicity of 3838 aliphatic carboxylic acids tested in the Tetrahymena pyriformis population growth assay, using the topological index ZEP and the following nine main electrotopological and molecular descriptors: acidic dissociation constant, 1-octanol/water partition coefficient, the energy of the lowest unoccupied molecular orbital, acidic dissociation constant, molar refractivity, refraction index, surface tension, polarizability and, electrotopological states. Several different relations between toxicity [loglog(IGC50-1)] and the molecular and topological properties were examined, and a group of multiple linear regression models with high fitness scores were generated.

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