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Column Chromatography Lab Report

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p-Dimethylaminobenzaldehyde (1g) and rhodanin-N-acetic acid (1.25g) were dissolved in ethanol (50 ml). The mixture was stirred thoroughly for a few minutes. The temperature was raised to 800C and the mixture was refluxed for 4 hours. The product was filtered. It was purified by recrystallisation from absolute ethanol. The yield was noted as 80%. It was further purified by column chromatography using 10:3 hexane-ethyl acetate solvent systems and dried in vacuum. The reaction s showing the synthesis of the products are shown in table 3.1
3.7.2. Synthesis of 4-[(E)-2-(3-hydroxynaphthalen-2-yl) diazen-1-yl] benzoic acid p-Aminobenzoic acid (1.37g) was dissolved in dil.HCl (2 N,15 ml) and cooled in ice. It was diazotised with an ice cold saturated
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