Synthesis of 2-Chlorobenzylidenemalononitrile (CS gas)

To a beaker add 2.64 g of malononitrile, 0.03 g of 1-methylimidazole and 21.6 mL of water, with stirring add 5.62 g of 2-chlorobenzaldehyde, heat to 35°C upon the addition. Allow to stand for 5 minutes filter and dry under a vacuum. Recrystallization is not needed since the purity should be 97-99%.

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