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EXAMPLE 11 900 g (5 moles) of 30percent methanolic sodium methylate solution (technical grade) and 1,350 ml of methanol were taken together, with exclusion of atmospheric moisture, and 617 g (2.5 moles) of O-methylisourea sulfate, pure from SKW Trostberg AG (corresponding to 5 moles of O-methylisourea) were introduced, while stirring and cooling externally with cold water, and stirring was continued for a further 15 minutes. 577 g (5 moles) of crude N-cyanoacetimido-ethyl ester with a content of 97.9percent were added dropwise, while stirring vigorously and cooling externally by running cold water, at a rate such that the internal temperature did not rise above 20° C. When the addition of the N-cyanoacetimido-ethyl ester had ended, the mixture was stirred for a further 2 hours, while cooling externally with cold water. The reaction mixture was then stirred for 17 hours, without cooling (room temperature: about 20° C.), 200 ml of water were subsequently added and stirring was continued at room temperature for a further 25 hours. The mixture was filtered with suction and the colorless residue was suspended twice in 2,000 ml of water each time, to remove the sodium sulfate, and then washed free from sodium sulfate on a suction filter. After drying in a vacuum drying cabinet at 80° C. (20 mbar), 694 g (99percent of theory) of 2-amino-4-methoxy-6-methyl-s-triazine having a melting point of 262° C. (decomposition) were obtained.
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