Hydrochloric Acid → HCID 20067180, compound

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Reaction Steps

42 g of 6-phenoxymethylpyridine-2,3-dicarboxylic acid diethyl ester are added to a solution of 0.5 g of tetrabutylammonium bromide in 140 ml of 15% aqueous sodium hydroxide solution while stirring. The resulting suspension is heated to 80° and stirred for one hour. The reaction mixture is then diluted with 300 ml of water and the solution is acidified to pH 2 using concentrated hydrochloric acid, during the course of which a precipitate forms which is filtered off with suction. The filtration residue is stirred with methylene chloride/tetrahydrofuran and filtered. The filtrate is dried over magnesium sulphate, concentrated and combined with the contents of the suction filter. After the whole has been dried again over phosphorus pentoxide, 34 g of the above acid, having a melting point of 270° with decomposition, are obtained.

Provenance & Evidence