Oxalic acid dihydrate → HCID 10632607, compound

Participants

Reaction Steps

4,5-Diethyl-1,2-diaminobenzene 24 (459 mg, 2.80 mmol) was dissolved in 4N hydrochloric acid (12 mL) at 90° C. Oxalic acid dihydrate (983 mg, 6.47 mmoL) was added to this solution in one portion with stirring under N2. The mixture was refluxed at 130°-5° C. (oil bath) for 3 h. A yellow solid precipitated, which was collected by suction filtration and dried in vacuo overnight, giving 538 mg (88%) of the title compound 25 as a brown solid; mp>360° C.; 1H NMR (DMSO-d6, 300 MHz) δ1.092 (t, 6H, J=7.5 Hz), 2.510 (q, 4H, J=7.5 Hz), 6.867 (s, 2H), 11.742 (s, 2H). EIMS m/e 218 (95, M+), 203 (100, M+ -CH3). (HPLC purity 100%)

Provenance & Evidence