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Synthetic procedure for the various 4-dialkylaminobenzaldehydes
    A mixture of aniline (0.26 g, 2.8 mmol), 1-alkylbromide (7.5 mmol), and K2CO3 (1.38 g, 10 mmol) in DMF (20 mL) was stirred for 24 h at 80 ¡æ and then cooled to room temperature and poured into water and extracted with ether. After the solvent was removed by a rotatory evaporator, the crude product was dried in vacuo and then added to a stirring solution of phosphoryl trichloride (5 mL) and DMF (20 mL) at room temperature and stirred for 6 h. The resulting mixture was poured into       ice-water and extracted with ether. The solvent was evaporated and the crude product was separated by column chromatography on silica gel using hexane¨Cethyl acetate (15/1) as the eluent. Colourless or a slight yellow oil was obtained in high yields of 80¨C90%. These compounds were characterized by 1H NMR and the relative data was as follows.

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