Ethylenediamine → 1,4,8,11-Tetraazacyclotetradecane-5,12-dione

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Reaction Steps

Methyl acrylate (344 g, 4.0 moles) was added dropwise into neat ethylenediamine (240 g, 4.0 moles) while stirring. Addition was conducted at such a rate that the reaction temperature did not exceed 45° C. Addition time was 4.0 hours. The crude colorless product, N-(2-aminoethyl)-β-alanine methyl ester (580 g), was dissolved in deionized water to give a concentration of about 25 weight percent. Allowing the solution to stand at room temperature for 2-3 days caused a white solid product to slowly precipitate. The product was obtained as a fine white powder, m.p. 198° C.-199° C. Spectral analysis confirmed the product's structure as

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