ChemInform Abstract: Pd/C-Catalyzed Coupling and Cyclization of β-Bromo-α,β-Unsaturated Carboxylic Acids with Terminal Alkynes Leading to Alkylidenefuranones.

ChemInform ◽  
2012 ◽  
Vol 43 (8) ◽  
pp. no-no
Author(s):  
Chan Sik Cho ◽  
Hyo Bo Kim
Keyword(s):  
Carboxylic Acids ◽  
Terminal Alkynes ◽  
Unsaturated Carboxylic Acids

Co-catalysis over a tri-functional ligand modified Pd-catalyst for hydroxycarbonylation of terminal alkynes towards α,β-unsaturated carboxylic acids

2019 ◽  
Vol 21 (19) ◽  
pp. 5336-5344 ◽  
Author(s):  
Da Yang ◽  
Huan Liu ◽  
Lei Liu ◽  
Wen-Di Guo ◽  
Yong Lu ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Pd Catalyst ◽  
Terminal Alkynes ◽  
Unsaturated Carboxylic Acids ◽  
Sulfonate Anion

An amphiphilic tri-functional ligand (L1) containing a phosphonium cation, a phosphino-fragment and a hydrophilic sulfonate anion enabled Pd(OAc)2 to co-catalyze hydroxycarbonylation of terminal alkynes towards α,β-unsaturated carboxylic acids.

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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