| 摘要 |
<p>Process for the production of 3-hydroxy-1,2,4-triazole derivatives of the formula I wherein R1 represents an alkyl or cycloalkyl group, R2 denotes an alkyl, cycloalkyl, alkenyl, alkynyl or an optionally substituted benzyl group and X stands for oxygen, sulphur or a group , wherein R3 denotes an alkyl, alkenyl or alkynyl group, wherein a 2-R1-hydrazinecarboxylic acid ester is reacted with cyanogen chloride to form the corresponding 2-R1-2-cyanohydrazinecarboxy-lic acid ester which is subsequently cyclised under alkaline conditions in the presence of a compound R2XH.</p> |
