scholarly journals Cp2TiCl2-catalyzed hydrocarboxylation of alkynes with CO2: formation of α,β-unsaturated carboxylic acids

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3534-3539 ◽  
Author(s):  
Peng Shao ◽  
Sheng Wang ◽  
Gaixia Du ◽  
Chanjuan Xi
Keyword(s):  
Carboxylic Acids ◽  
Atmospheric Pressure ◽  
Unsaturated Carboxylic Acids ◽  
High Yields

Cp2TiCl2-catalyzed hydrocarboxylation of alkynes with CO2 (atmospheric pressure) has been reported. A range of alkynes were transformed to the corresponding α,β-unsaturated carboxylic acids in high yields with high regioselectivity.

Nickel-catalyzed electrocarboxylation of allylic halides with CO2

2021 ◽  
Author(s):  
Laxia Wu ◽  
Deng Fangjie ◽  
Lin Wu ◽  
Huan Wang ◽  
TaiJie Chen ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Current Density ◽  
Atmospheric Pressure ◽  
Reaction Parameters ◽  
Unsaturated Carboxylic Acids ◽  
Allylic Halides

Nickel-catalyzed regioselective electrocarboxylation of allylic halides with CO2 at atmospheric pressure has been developed by adjusting reaction parameters, including catalyst, solvent, current density, temperature and additive. β,γ-unsaturated carboxylic acids were...

Ni-Catalyzed Carboxylation of Conjugated Dienes with Carbon Dioxide and DIBAL-H for the Synthesis of ß,γ-Unsaturated Carboxylic Acids

Synlett ◽  
2020 ◽  
Author(s):  
Masanari Kimura ◽  
Ying Luo ◽  
Bun Chan ◽  
Tsutomu Fukuda ◽  
Gen Onodera
Keyword(s):  
Carbon Dioxide ◽  
Carboxylic Acids ◽  
Atmospheric Pressure ◽  
Conjugated Dienes ◽  
Ni Catalyst ◽  
Diisobutylaluminum Hydride ◽  
Unsaturated Carboxylic Acids

Ni-catalyst-promoted conjugated dienes undergo 1,2-hydrocarboxylation with carbon dioxide under atmospheric pressure and in the presence of diisobutylaluminum hydride (DIBAL-H). Conjugated dienes react with carbon dioxide in a 1:1 ratio to produce the corresponding β,γ-unsaturated carboxylic acids without suffering from the dimerization or oligomerization of conjugated dienes.

AUTOXIDATION REACTIONS CATALYZED BY COBALT ACETATE BROMIDE

1965 ◽  
Vol 43 (5) ◽  
pp. 1306-1317 ◽  
Author(s):  
Allan S. Hay ◽  
Harry S. Blanchard
Keyword(s):  
Acetic Acid ◽  
Acid Solution ◽  
Carboxylic Acids ◽  
Atmospheric Pressure ◽  
Active Catalyst ◽  
Acetic Acid Solution ◽  
Cobalt Acetate ◽  
Major Product ◽  
High Yields

Cobalt acetate bromide in acetic acid solution is an extraordinarily active catalyst for the autoxidation of hydrocarbons. Carboxylic acids and ketones are readily prepared in high yields at moderate temperatures and at atmospheric pressure. In addition, benzylic and allylic groups can be converted to esters of the corresponding alcohols, and the oxidation of tetralin can be controlled to give either α-tetralone or 1,2-dihydronaphthalene as the major product. A mechanism for these reactions is postulated.

Synthesis of 3-(Cyclohexylamino)-2-arylimidazo[1,2-a]pyridine-8- carboxylic Acids Via an Efficient Three-component Condensation Reaction between Cyclohexylisocyanide and 2-Aminopyridine-3-carboxylic Acid in the Presence of Aromatic Aldehyde

2018 ◽  
Vol 21 (4) ◽  
pp. 298-301 ◽  
Author(s):  
Ghasem Marandi
Keyword(s):  
Biological Sciences ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
High Performance ◽  
Condensation Reaction ◽  
Aromatic Aldehydes ◽  
New Materials ◽  
One Pot ◽  
High Yields ◽  
Benzaldehyde Derivatives

Aim and Objective: The reaction of cyclohexylisocyanide and 2-aminopyridine-3- carboxylic acid in the presence of benzaldehyde derivatives in ethanol led to 3-(cyclohexylamino)-2- arylimidazo[1,2-a]pyridine-8-carboxylic acids in high yields. In a three component condensation reaction, isocyanide reacts with 2-aminopyridine-3-carboxylic acid and aromatic aldehydes without any prior activation. Material and Methods: The synthesized products have stable structures which have been characterized by IR, 1H, 13C and Mass spectroscopy as well as CHN-O analysis. Results: In continuation of our attempts to develop simple one-pot routes for the synthesis of 3- (cyclohexylamino)-2-arylimidazo[1,2-a]pyridine-8-carboxylic acids, aromatic aldehydes with divers substituted show a high performance. Conclusion: In conclusion, this study introduces the art of combinatorial chemistry using a simple one-pot procedure for the synthesis of new materials which are interesting compounds in medicinal and biological sciences.

Perturbation theory of substituent effect. Importance of the field effect in transmission of the substituent effect

1980 ◽  
Vol 45 (6) ◽  
pp. 1655-1661 ◽  
Author(s):  
Robert Ponec
Keyword(s):  
Perturbation Theory ◽  
Carboxylic Acids ◽  
Quantum Chemical ◽  
Substituent Effect ◽  
Field Effect ◽  
Adequate Description ◽  
Meta Position ◽  
Unsaturated Carboxylic Acids

Various quantum chemical approaches to the problem of transmission of the substituent effect were compared. It was shown that inclusion of the electronic repulsion (field effect) was necessary to give a true picture of differences in ρ constants for reactions of the cis and trans isomers of substituted unsaturated carboxylic acids; the same holds for an adequate description of transmission of the substituent effect from the meta position on a given skeleton.

scholarly journals A solvent-dependent chirality-switchable thia-Michael addition to α,β-unsaturated carboxylic acids using a chiral multifunctional thiourea catalyst

2020 ◽  
Vol 11 (21) ◽  
pp. 5572-5576 ◽  
Author(s):  
Noboru Hayama ◽  
Yusuke Kobayashi ◽  
Eriko Sekimoto ◽  
Anna Miyazaki ◽  
Kiyofumi Inamoto ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Tertiary Amine ◽  
Michael Addition ◽  
Arylboronic Acid ◽  
Unsaturated Carboxylic Acids

An asymmetric thia-Michael addition of arylthiols to α,β-unsaturated carboxylic acids using a thiourea catalyst that bears arylboronic acid and tertiary amine moieties is reported.

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