Diethylene Glycol Monomethyl Ether → Ethylenediamine, N-(4-aminophenyl)-

Participants

Reaction Conditions

Reaction Steps

A mixture of p-diaminobenzene dihydrochloride (20.1 g, 0.11 mole), 2-oxazolidinone (17.4 g, 0.20 mole) and 100 ml of 2-(2-methoxyethoxy)ethanol was heated to 189° C. in an oil bath while being vigorously stirred mechanically. After two and one-half hours, all gas evolution had ceased and the dark purple reaction mixture was allowed to cool to room temperature. Most of the solvent was removed in vacuo while applying heat (95° C./10 mm Hg) to give a viscous, dark purple oil. After dissolution of the crude triamine dihydrochloride in 100 ml of a 10 percent aqueous sodium hydroxide solution, the free amine was extracted with three portions of chloroform. During the extraction, solid sodium chloride was added to help break up the emulsion which formed. The combined chloroform portions were dried over anhydrous potassium carbonate and filtered. After removal of the solvent in vacuo, approximately 20 g of the crude amine was obtained as a dark yellow oil. Kugelrohr distillation (bulb to bulb) at 160° C. to 190° C. (0.1 mm Hg) afforded a 29 percent yield of the triamine as a pale yellow oil. The product structure was confirmed by spectral studies.

Provenance & Evidence