1,2,4-triazin-5-one compounds of the general formula (I) ##STR1## where R is ##STR2## are prepared by reacting a compound of general formula (II) ##STR3## in which R is defined above with either (a) a tertiary alcohol of general formula (III) HO--R' (III) in which R' is a t-alkyl group having 4 to 18 carbon atoms, especially t-amyl or t-octyl or preferably t-butyl or (b) an alkene of general formula (IV) ##STR4## in which R.sub.1 and R.sub.2 are the same or different and are hydrogen or an alkyl group and R.sub.3 and R.sub.4 are the same or different and wherein the alkyl groups in each case can be 1 to 15 carbon atoms and wherein preferably R.sub.1 and R.sub.2 are hydrogen and R.sub.3 and R.sub.4 each are methyl to form an .alpha.-ketocarboxylic acid amide of general formula (V) ##STR5## and this, in a given case after previous saponification to the free acid, condensed with thiocarbohydrazide ##STR6## to form a 1,2,4-triazin-5-one compound of general formula (VI) ##STR7## and then the mercapto group is methylated.
通式为(I)的
1,2,4-三嗪-5-
酮化合物,其中R为##
STR2##,通过将通式为(II)的化合物##
STR3##,其中R如上所定义,与(a)通式为(III)HO-R'(III)的
三级醇反应,其中R'是具有4到18个
碳原子的t-烷基,特别是t-戊基或t-辛基或更好地是t-丁基,或(b)通式为(IV)的
烯烃反应,其中R.sub.1和R.sub.2相同或不同,是
氢或烷基,R.sub.3和R.sub.4相同或不同,其中各情况下的烷基可以是1到15个
碳原子,其中R.sub.1和R.sub.2最好是
氢,R.sub.3和R.sub.4各自是
甲基,以形成通式为(V)的α-
酮羧酸酰胺##
STR5##,在某些情况下,在前面的皂化之后,与
硫代
氨基甲酸酯##
STR6##缩合,形成通式为(VI)的
1,2,4-三嗪-5-
酮化合物##
STR7##,然后
硫醇基被
甲基化。