609-99-4Relevant articles and documents
Intramolecular base catalysed hydrolysis of ortho-hydroxyaryl esters: The anomalous position of methyl 3,5-dinitrosalicylate on the Linear Free Energy Relationship plot
Moozyckine, Alexei U.,Davies, D. Martin
, p. 1158 - 1161 (2002)
The pKa of the ortho-hydroxy group in methyl 3,5-dinitrosalicylate, HMDNS, is 2.45. Rate constants for the reaction of its conjugate base, MDNS- with hydroxide anion and water are 5.3 × 10-2 mol dm-3 s-1 and 6.6 × 10-6 s-1, respectively at 25°C. The rate constant for the uncatalysed reaction of HMDNS and water is 6.5 × 10-6 s-1 and so there is no evidence for intramolecular general base catalysis of the water reaction with MDNS- by the weakly basic ortho-O-. By means of Bronsted plots the water reaction of MDNS- is compared with that of a group of other salicylate esters (β = 0) and also a structurally different group of esters (β = 0.4), both of which undergo intramolecular base catalysed hydrolysis. Although the title ester structurally belongs to the first set of compounds, its anomalous position on the plot clearly corresponds to the trend of the second set. This is explained in terms of differences in resonance stabilisation and hydrogen bonding in the transition state.
NOVEL WATER SOLUBLE POLYIMIDE RESIN, ITS PREPARATION AND USE
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, (2011/08/03)
The present invention relates to a novel water soluble polyimide resin, which contains a hydrophilic functional group such as —OH, —COOH to increase the solubility of the polyimide resin in alkali aqueous solution, and is suitable for using as an insulation film in electronic and photoelectric products. The present invention also relates to preparation and use of the above polyimide.
Process for the synthesis of hydroxy aromatic acids
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Page/Page column 20-21, (2008/06/13)
Hydroxy aromatic acids are produced in high yields and high purity (>95%) from halogenated aromatic acids in a reaction mixture containing a copper source and a ligand that coordinates to copper.
Nitration of aromatic compounds by Zn(NO3)2· 2N2O4 and its charcoal-supported system
Iranpoor, Nasser,Firouzabadi, Habib,Heydari, Reza,Shiri, Morteza
, p. 263 - 270 (2007/10/03)
Zn(NO3)2·N2O4 and its charcoal supported system were found to be efficient nitrating agents. Mononitration of aromatic compounds such as benzene, alkyl benzenes, halobenzenes, nitrobenzene, anisol, and the highly selective mono-, di-, and trinitration of phenol, and dinitraion of substituted phenols were also performed in the presence of these reagents.