Hydrochloric Acid → HCID 20369780, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 17.4 g (0.03 mole) of the intermediate 2,6-bis-(2-phthalimidoethoxy)anthraquinone, prepared in (A) above, 200 ml. of methanol, and 3.6 g. (0.06 mole) of hydrazine hydrate (85%) is heated to reflux for four hours. Water (100 ml.) is added and the methanol boiled out of the mixture. Then, 75 ml. of 37% hydrochloric acid is added and the resulting mixture heated to reflux for another hour. The mixture is allowed to cool, then chilled at 0° C., and the precipitate of phthalhydrazide removed by filtration with suction. The filtrate is evaporated to dryness, made alkaline with 10% sodium hydroxide, and the base is extracted into chloroform. The chloroform layer is washed with water, dried with anhydrous magnesium sulfate, filtered, and the chloroform evaporated. The 2,6-bis-(2-aminoethoxy)anthraquinone base is converted to the dihydrochloride salt as described in Example 1, and recrystallized from a solvent or solvent mixture such as isopropanol, ethanol/ether, or butanone/methanol. In a similar manner, 2,7-bis(2-aminoethoxy)anthraquinone can be prepared from 2,7-bis(2-chloroethoxy)anthraquinone.

Provenance & Evidence