Air oxidation of 2,6-diisopropylnaphthalene to 2,6-naphthalenedicarboxylic acid in liquid phase;

The Effects of operation mode,reaction temperature,metal catalyst concentration, bromine concentration and reaction pressure on the liquid phase catalytic oxidation of 2,6-diisopropyl- naphthalene(2,6-DIPN)to 2,6-naphthalenedicarboxylic acid(2,6-NDCA)over Co-Mn-Br catalyst were investigated in a high-pressure reactor.

The process conditions of preparing 2,6-naphthalenedicarboxylic acid(2,6-NDCA)by air-oxidizing 2,6-diisopropylnaphthalene(2,6-DIPN)in liquid-phase were studied in a semi-continued titanium reactor with stirring,using cobalt acetate and manganese acetate as main catalyst,potassium bromide as promoter,potassium acetate as co-catalyst.

Study on catalytic synthesis of the pyridine-2,6-dicarboxylic acids dibutyl ester;

Asimple,novel and soft method for the synthesis of 2,6-pyridinedicarboxaldehyde from 2,6-dipicolinic acids is described.

In order to optimize synthesis process of 2,6-difluorobenzoic acid (DFBA), 2,6-difluorobenzonitrile is fluorization synthesized from 2,6-dichlorobenzonitrile (DCBN) and potassium fluoride with N,N-dimethylformamide (DMF) as a solvent over the polyether catalyst A, and then the intermediate 2,6-difluorobenzonitrile is hydrolyzed under the alkali conditions to get DFBA.

In a 200 mL stainless steel autoclave, dimethyl 2,6 naphthalene dicarboxylate (DM 2,6 NDC) was prepared by reacting 2,6 naphthalenedicarboxylic acid (2,6 NDA) with methyl alcohol in the presence of phosphotungstic acid as catalyst.