2-Methoxyethanol → HCID 15219320, compound

Participants

Reaction Conditions

Reaction Steps

In the next step, to a sealed glass reaction vessel equipped with a thermometer, stirrer and reflux condenser, 156 g (0.41 mole) of the above 1,3-bis(3-amino-4-chlorobenzoyl)benzene, 145 g (2.13 mole) of sodium formate, 787 g of 2-methoxyethanol and 43 g of water were charged and heated to 100° C. with stirring. Successively, 7.8 g of a 5% palladium/activated carbon catalyst (a product of M.E. Chemcat Co.) was gradually added and the reaction was continued at 100° C. for 3 hours with stirring. The reaction mixture was cooled to 85° C. and hot filtered to remove the catalyst. The filtrate was poured into 4 l of water. The precipitated yellow crystals were filtered, washed with water and dried. Crude crystal of the desired 1,3-bis(3-aminobenzoyl)benzene were thus obtained in an amount of 126 g (97% yield). The crystals were analyzed by high performance liquid chromatography and determined to have a purity of 85.3%. The crude 1,3-bis(3-aminobenzoyl) benzene was dissolved in 630 g of toluene by heating and hot filtered to remove insoluble matter. Successively, 89 g of a 36% aqueous hydrochloric acid solution was added to the filtrate and allowed to cool. The precipitated crystal of 1,3-bis(3-aminobenzoyl)benzene hydrochloride was recrystallized from ethanol to obtain crystals of pure 1,3-bis(3-aminobenzoyl)benzene hydrochloride. The hydrochloride was dissolved in 1 l of water and neutralized with an aqueous ammonia solution. The precipitated yellow crystals were filtered, washed with water and dried. The desired product, crystals of pure 1,3-bis(3-aminobenzoyl)benzene were thus obtained in an amount of 85g (67% yield). Melting point was 114.2°~116.9° C.

Provenance & Evidence