scholarly journals Smaller, faster, better: modular synthesis of unsymmetrical ammonium salt-tagged NHC–gold(i) complexes and their application as recyclable catalysts in water

2015 ◽  
Vol 13 (31) ◽  
pp. 8556-8560 ◽  
Author(s):  
Katrin Belger ◽  
Norbert Krause
Keyword(s):  
Carboxylic Acids ◽  
Ammonium Salt ◽  
Aqueous Media ◽  
Cyclization Reactions ◽  
Modular Synthesis ◽  
Recyclable Catalysts

Facile access towards unsymmetrical ammonium salt-tagged NHC-gold(i) complexes is described, and their application as recyclable catalysts in cyclization reactions of acetylenic carboxylic acids and amides in aqueous media is demonstrated.

The synthesis of coumarin-3-carboxylic acids and 3-acetyl-coumarin derivatives using heteropolyacids as heterogeneous and recyclable catalysts

2008 ◽  
Vol 9 (3) ◽  
pp. 470-474 ◽  
Author(s):  
Majid M. Heravi ◽  
Samaheh Sadjadi ◽  
Hossein A. Oskooie ◽  
Rahim Hekmat Shoar ◽  
Fatemeh F. Bamoharram
Keyword(s):  
Carboxylic Acids ◽  
Coumarin Derivatives ◽  
Recyclable Catalysts

Oxidation of α-Substituted Carbonyl Compounds to Carboxylic Acids in Aqueous Media Using Ultrasound

1997 ◽  
Vol 27 (9) ◽  
pp. 1601-1605 ◽  
Author(s):  
D. T. C. Yang ◽  
C. J. Zhang ◽  
P. P. Fu ◽  
G. W. Kabalka
Keyword(s):  
Carboxylic Acids ◽  
Carbonyl Compounds ◽  
Aqueous Media

Cationic Pd(II)/bipyridine-catalyzed conjugate addition of arylboronic acids to α,β-unsaturated carboxylic acids in aqueous media

2018 ◽  
Vol 59 (13) ◽  
pp. 1192-1195 ◽  
Author(s):  
Yuxin Ni ◽  
Kaixuan Song ◽  
Kai Shen ◽  
Zhenyu Yang ◽  
Rui Liu ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Aqueous Media ◽  
Conjugate Addition ◽  
Arylboronic Acids ◽  
Unsaturated Carboxylic Acids

Efficient synthesis of pyrido[2,3-d]pyrimidine-7-carboxylic acids catalyzed by a TiO2/SiO2 nanocomposite in aqueous media at room temperature

2018 ◽  
Vol 73 (9) ◽  
pp. 641-645 ◽  
Author(s):  
Sepehr Sadegh-Samiei ◽  
Shahrzad Abdolmohammadi
Keyword(s):  
Heterogeneous Catalyst ◽  
Carboxylic Acids ◽  
Room Temperature ◽  
Aqueous Media ◽  
Reaction Times ◽  
Molar Ratio ◽  
Efficient Synthesis ◽  
Reaction Conditions ◽  
Moderate Reaction ◽  
Recyclable Heterogeneous Catalyst

AbstractA novel and efficient synthesis of eight 5-aryl-1,3-dimethyl-2,4-dioxo-1,2,3,4,5,8-hexahydropyrido[2,3-d]pyrimidine-7-carboxylic acids using a TiO2/SiO2 nanocomposite with a molar ratio of 1:1 as a recyclable heterogeneous catalyst is described. The desired products, five of which are new, are formed in short reaction times (2–3 h) with high to excellent yields (94%–98%) under very moderate reaction conditions (room temperature, aqueous media).

Salts of Sulfated Oleic Acid Amides as Acid Corrosion Inhibitors

2021 ◽  
Vol 625 (3) ◽  
pp. 36-38
Author(s):  
E. K. Aminova ◽  
◽  
V. V. Fomina ◽  
Keyword(s):  
Oleic Acid ◽  
Sulfuric Acid ◽  
Hydrochloric Acid ◽  
Aqueous Solutions ◽  
Carboxylic Acids ◽  
Ammonium Salt ◽  
Dilute Hydrochloric Acid ◽  
Corrosion Inhibitors ◽  
Acid Corrosion ◽  
Protective Ability

This work is a continuation in a series of studies on the preparation of acid corrosion inhibitors based on carboxylic acids. A method of synthesis of acid corrosion inhibitors based on oleic acid amides has been developed. Several syntheses have been carried out to increase its inhibitory properties. The substances were obtained in several stages. At the first stage, amino alcohols were added to the ОA, then the resulting compounds were sulfonated with sulfuric acid. To expand the field of various inhibitors, reactions with bases are produced. As a result, salts of sulfated amides of oleic acid synthesized with amino nitrates, sulfuric acid and aqueous solutions of bases were formed. To establish the effectiveness of the compounds obtained, the protective ability in dilute hydrochloric acid was evaluated. It is established that some of the obtained substances exhibit the corresponding properties of inhibitors. In this case, the most effective is the ammonium salt of sulfated diethanolamide oleic acid.

Oxidative oxygen-nucleophilic bromo-cyclization of alkenyl carbonyl compounds without organic wastes using alkali metal reagents in green solvent

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85872-85878 ◽  
Author(s):  
Katsuhiko Moriyama ◽  
Chihiro Nishinohara ◽  
Toru Sugiue ◽  
Hideo Togo
Keyword(s):  
Alkali Metal ◽  
Carboxylic Acids ◽  
Carbonyl Compounds ◽  
Organic Wastes ◽  
Green Solvent ◽  
Cyclization Reactions ◽  
Metal Reagents

A bromo-lactonization of alkenyl carboxylic acids and a bromo-cyclization ofN-allyl amides as oxygen-nucleophilic bromo-cyclization reactions were developedviathe oxidative umpolung of bromide using alkali metal bromide and inorganic oxidant.

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