Abstract: The invention relates to a method for producing 2-amino-4,6-dichloro-5-formamidopyrimidine from 2,5-diamino-4,6-dihydroxypyrimidine or a salt thereof. According to said method, a) 2,5-diamino-4,6-dihydroxypyrimidine or the salt or tautomer forms thereof are reacted with a chlorination agent and a formamide of formula (I) wherein R1 and R2 independently represent a C1-C4 alkyl radical or —R1-R2— represents —(CH2)n— where n=4-6, or —(CH2)2-0-(CH2)2—, without adding a solvent, at a temperature of between 50 and 130° C., b) the reaction product obtained in step a) is reacted with water at a temperature of between 0 and 100° C., and regulated to a pH value of between 1 and 6 with an inorganic base, and c) the aqueous reaction mixture obtained in step b) is left to react at a temperature of between 70 and 120° C. under hydrolysis to form 2-amino-4,6-dichloor-5-formamidopyrimidine. The inventive method enables satisfactory yields and high levels of purity of the end product to be obtained.

Abstract: Novel 2-alkoxy-5-methoxypyrimidines and tautomeric forms thereof and also processes for preparing them are described. The 2-alkoxy-5-methoxypyrimidines according to the invention can be synthesized in few reaction steps and in high yields from simple precursors.

Abstract: Novel 2-alkoxy-5-methoxypyrimidines and tautomeric forms thereof and also processes for preparing them are described. The 2-alkoxy-5-methoxypyrimidines according to the invention can be synthesized in few reaction steps and in high yields from simple precursors.

Abstract: A process for the preparation of N-cyanoethanimidic acid esters by reacting orthoacetic acid esters with cyanamide. The reaction is carried out in alcoholic solution in the presence of an acid catalyst. N-cyanoethanimidic acid esters can be prepared in this manner in a high yield and high state of purity, with a low technical outlay and in an environmentally safe manner, free of dangerous by-products.

Abstract: The present invention relates to a process for the preparation of solid sodium hydrogen cyanamide by reacting cyanamide with sodium hydroxide in aqueous solution, the aqueous solution or suspension containing sodium hydrogen cyanamide being concentrated to dryness with the aid of a drier device which uses heating gases, preferably, a spray drier or atomization drier, and, if appropriate, the product then being dried. A pulverulent product with good flow properties, purity and storage stability is thereby obtained in an industrially simple manner.