Acetic Acid → 4-Thiazolidinone, 5-[(2,3-dimethoxyphenyl)methylene]-2-thioxo-

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A mixture of 2,3-dimethoxybenzaldehyde (5.2 g, 30 mmoles), rhodanine (4.0 g, 29 mmoles), sodium acetate (8.4 g, 102 mmoles), and acetic acid (50 ml) is stirred under an inert atmosphere and heated to reflux. After 4 hours the mixture is stirred into water (250 ml) and the precipitate is filtered off, rinsed successively with water (3×), ethanol (2×), and ether (2×), and dried to afford the pure product (7.8 g), mp 268°-269° C.

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