In the production of an S-substituted isothiourea including the function group ##STR1## in which R.sup.1 is an alkyl, alkenyl, aryl or aralkyl radical, wherein a thiourea including the functional group ##STR2## is reacted with an etherifying agent to replace H by R.sup.1, the improvement which comprises effecting the reaction in two steps, in the first step reacting the thiourea material with an etherifying agent including the radical R in which R is an alkyl, alkenyl aryl or aralkyl radical different from R.sup.1 thereby to produce the ether ##STR3## and in the second step reacting the ether with a compound of the formula R.sup.1 SH. The process is particularly applicable to the production of the known herbicide ##STR4## from the corresponding thiourea where in the first step methyl bromide or methyl iodide is used to form the S-methyl isothiourea which is then interchanged with ethyl mercaptan. Higher overall yields and/or economies are thereby achieved.
在生产一种包括功能基团##STR1##的S-取代异
硫脲中,其中R.sup.1是烷基、烯基、芳基或芳基烷基基团,其中一种
硫脲与一种醚化剂反应,将H替换为R.sup.1,改进包括在两个步骤中进行反应,第一步中将
硫脲材料与包括基团R的醚化剂反应,其中R是烷基、烯基、芳基或芳基烷基基团,不同于R.sup.1,从而产生醚##STR3##,第二步中将醚与化合物R.sup.1 SH反应。该过程特别适用于从相应的
硫脲中生产已知的
除草剂##STR4##,在第一步中使用
溴化甲基或
碘化甲基形成S-甲基异
硫脲,然后与
硫醇乙基交换。从而实现更高的总产量和/或经济效益。