Process for the preparation of 2-amino-s-triazines

Details Process for the preparation of 2-amino-s-triazines Process for the preparation of 2-amino-s-triazines

C - Chemistry, Metallurgy

07

D

260/249.9

C07D 251/42 (2006.01) C07C 233/00 (2006.01) C07D 251/16 (2006.01) C07D 251/18 (2006.01) C07D 251/22 (2006.01)

Patent

CA 1250574

Abstract The present invention relates to a process for the preparation of 2-amino-s-triazines in three stages by reacting nitriles, alcohols and hydrogen chloride to form the corresponding imido-ester hydrochlorides in the first stage, and subsequently reacting the imido-ester hydrochlorides with cyanamide in the aqueous phase to form the N-cyanimido-esters in the second stage, which comprises carrying out the first stage in the presence of acetic acid esters and the second stage in an aqueous solution which has been brought to a pH value of 5 - 8 by addition of bases, and reacting the N-cyanimido-esters with O-alkylisourea, S-alkylisothiourea, guanidine or amidine salts in the presence of a base in the third stage. The 2-amino-s-triazines can be prepared in a high purity and with good yields in this manner.

474228

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