Kinetic Study of Electrochemically Induced Michael Reactions of <i>o</i>-Quinones with Meldrum’s Acid Derivatives. Synthesis of Highly Oxygenated Catechols
作者:D. Nematollahi、H. Shayani-jam
DOI:10.1021/jo800115n
日期:2008.5.1
Electrochemical oxidation of catechols has been studied in the presence of Meldrum’s acid derivatives as nucleophiles in aqueous solution, by means of cyclic voltammetry and controlled-potential coulometry. Catechols in the Michael addition reaction react with Meldrum’s acids to form adducts that can undergo electrooxidation. Such products were obtained in good yields as confirmed by controlled potential
The present invention relates to neurologically-active compounds, processes for their preparation and their use as pharmaceutical or veterinary agents, in particular for the treatment of neurological conditions, more specifically neurodegenerative conditions such as Alzheimer's disease.
Compounds of formula Ie, or a salt, hydrate, solvate, derivative, pro-drug, tautomer and/or isomer thereof:
wherein R, R1, m and q are as defined in the claims, and their use as pharmaceutical or veterinary agents, in particular for the treatment of neurological conditions including Alzheimer's disease.
Effects of electron-withdrawing substituents on DPPH radical scavenging reactions of protocatechuic acid and its analogues in alcoholic solvents
作者:Shizuka Saito、Jun Kawabata
DOI:10.1016/j.tet.2005.06.040
日期:2005.8
The DPPH (2,2-diphenyl-l-picrylhydrazyl) radical scavenging activity of protocatechuic acid (3,4-dihydroxybenzoic acid) and its related catechols was examined. Compounds possessing strong electron-withdrawing substituents showed high activity. NMR analysis of the reaction mixtures of catechols and DPPH radical in methanol showed the formation of methanol adducts. The results suggest that high radical scavenging activity of catechols in alcohol is due to a nucleophilic addition of an alcohol molecule on o-quinones, which leads to a regeneration of a catechol structure. Furthermore, the radical scavenging activity in alcohols would largely depend on the electron-withdrawing/donating substituents, Since they affect the susceptibility toward nucleophilic attacks on o-quinone. (c) 2005 Elsevier Ltd. All rights reserved.
ELECTROLYTE, AND ELECTROCHEMICAL DEVICE AND ELECTRONIC DEVICE INCLUDING SAME
申请人:Ningde Amperex Technology Limited
公开号:US20220153690A1
公开(公告)日:2022-05-19
An electrolyte including one or more nitrile benzoquinone compounds, and the nitrile benzoquinone compound is selected from the group consisting of the compounds represented by formula I, formula II, and formula III:
The substituents R
1
to R
9
are each independently selected from the group consisting of hydrogen, a C
2
to C
12
ether group, a C
1
to C
12
alkoxy group, halogen, a C
1
to C
12
alkyl group, a C
2
to C
12
alkenyl group, a C
2
to C
12
alkynyl group, and a C
6
to C
26
aryl group. The electrolyte can form a stable protective film on a cathode, thereby increasing the cycle capacity retention rate and high temperature storage performance of an electrochemical device.