ChemInform Abstract: Copper-Catalyzed Carboxylation of Alkenylzirconocenes with Carbon Dioxide Leading to α,β-Unsaturated Carboxylic Acids.

ChemInform ◽  
2016 ◽  
Vol 47 (8) ◽  
pp. no-no
Author(s):  
Sheng Wang ◽  
Peng Shao ◽  
Chao Chen ◽  
Chanjuan Xi
Keyword(s):  
Carbon Dioxide ◽  
Carboxylic Acids ◽  
Unsaturated Carboxylic Acids

Aktivierung von CO2 an Übergangsmetallzentren: Struktur und Reaktivität eines C-C-Kopplungsproduktes von CO2 und 2.3-Dimethylbutadien am elektronenreichen Nickel(O) / Activation of CO2 at Transition Metal Centers: Structure and Reactivity of a C-C-Coupling Product of CO2 and 2,3-Dimethylbutadiene at Electron-Rich Nickel(O)

1983 ◽  
Vol 38 (7) ◽  
pp. 835-840 ◽  
Author(s):  
Dirk Walther ◽  
Eckhard Dinjus ◽  
Joachim Sieler ◽  
Nguyen Ngoc Thanh ◽  
Wolfgang Schade ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Transition Metal ◽  
Carboxylic Acids ◽  
Coordination Sphere ◽  
Oxidative Coupling ◽  
Central Atom ◽  
Carboxylate Group ◽  
Metal Centers ◽  
X Ray ◽  
Unsaturated Carboxylic Acids

Carbon dioxide reacts with 2,3-dimethylbutadiene and bis-cyclooctadiene(1,5)-nickel(O) in the presence of N,N′-tetramethyl-ethylendiamine (tmeda) to form [(3,4,5-η3)-3,4-dimethyl-3-pentenylato](N,N′-tetramethyl-ethylendiamine)-nickel(II) as the product of the oxidative coupling of CO2 and the diene. The deep red complex crystallizes in the rhombic space group Pbca. The structure was determined by an X-ray analysis. The monodendate carboxylate group, the π-allyl system and a N-atom of tmeda form a planar coordination sphere around the central atom. The distance between Ni and the second N-atom of tmeda is very long (2.314 Å). Reaction of the complex with R−X (R: H, CH3) yield 3-unsaturated carboxylic acids; tmeda can be substituted by 2,2′-bipyridine.

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.

Asymmetric hydrogenation of α,β-unsaturated carboxylic acids in supercritical carbon dioxide

1996 ◽  
Vol 37 (16) ◽  
pp. 2813-2816 ◽  
Author(s):  
Jianliang Xiao ◽  
Sylvia C.A. Nefkens ◽  
Philip G. Jessop ◽  
Takao Ikariya ◽  
Ryoji Noyori
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Carboxylic Acids ◽  
Asymmetric Hydrogenation ◽  
Unsaturated Carboxylic Acids ◽  
Supercritical Carbon

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.

Sign in / Sign up

Export Citation Format

Share Document