C([O:4][CH2:5][CH2:6][N:7]([CH2:16][CH2:17][O:18]C(=O)C)[C:8]1[CH:15]=[CH:14][C:11]([CH:12]=[O:13])=[CH:10][CH:9]=1)(=O)C.C[O-].[Na+].C(O)(=O)C>CN(C)C=O.CO>[OH:4][CH2:5][CH2:6][N:7]([CH2:16][CH2:17][OH:18])[C:8]1[CH:15]=[CH:14][C:11]([CH:12]=[O:13])=[CH:10][CH:9]=1To a solution of 293 g of 4-di-(2-acetoxyethyl) aminobenzaldehyde (see under Example 2b) in 500 ml of dimethyl formamide was added a solution of 54 g of sodium methanolate in 500 ml of methanol. After stirring for 30 minutes at room temperature the reaction mixture was neutralized with acetic acid and concentrated to a small volume. The residue was taken up in 500 ml of water and 500 ml of ethyl acetate. The water layer was separated and extracted six times, each time with a portion of 500 ml of ethyl acetate. The combined organic layers were dried on magnesium sulphate and evaporated. The residue was crystallized from 500 ml of ethyl acetate to yield 156 g of 4-di(2-hydroxyethyl)aminobenzaldehyde with a melting point of 63°-64° C.
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