Diethyl 2,4-dicyanopentanedioate → Ethyl cyanoacrylate

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In a 400 liter capacity stirrer-equipped vessel, 130 kg of distillation residue from the production of 2-cyanoacrylate, containing 75.1% by weight of 2,4-dicyanoglutaric acid diethyl ester (410 moles), were mixed with 21.3 kg of water and the resulting mixture reacted with 8.83 kg of 92% polyoxymethylene (271 moles) in the presence of 804.6 g of 32% NaOH solution which was required to adjust the pH into the range of from 4 to 6. The reaction was carried out and the reaction product worked up in the same way as described in EXAMPLE 1. 58.7 kg of pure 2-cyanoacrylic acid ethyl ester were obtained, corresponding to a yield of 60.1% by weight, based on 100% 2,4-dicyanoglutarate.

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