An advantageous process for preparing agriculturally suitable precursor compositions containing a compound of Formula IV is disclosed. The process involves (a) reacting a compound of Formula V with a nitrosating agent to provide a diazonium ion of Formula Va, (b) reacting the diazonium ion with a compound of Formula VI in the presence of a copper salt catalyst to obtain a reaction product containing the compound of Formula IV and greater than 100 ppm copper (based on the weight of Formula IV compound), and (c) separating copper from the Formula IV compound to obtain a purified product composition containing the compound of Formula IV and less than 10 ppm copper (based on the weight of Formula IV compound). ##STR1## A method for preparing a cyclic urea fungicides of Formula I is disclosed, which involves (1) preparing an agriculturally suitable precursor composition as indicated (2) reacting the oxime of Formula IV from said precursor composition with a compound of Formula III to provide a compound of Formula II, and (3) reacting the compound of Formula II with a compound of Formula MOR.sup.1. ##STR2## Suitable R.sup.1 -R.sup.5, R.sup.7, R.sup.8 and Lg are indicated in the specification.
                            本发明揭示了一种制备含有IV式化合物的适用于农业的前体组合物的有利过程。该过程涉及(a)将V式化合物与亚硝化剂反应,以提供Va式重氮离子,(b)在
铜盐催化剂的存在下将重氮离子与VI式化合物反应,以获得含有IV式化合物的反应产物和大于100 ppm
铜(基于IV式化合物的重量),(c)从IV式化合物中分离
铜,以获得含有IV式化合物的纯化产品组合物和少于10 ppm
铜(基于IV式化合物的重量)。 ##STR1## 本发明揭示了一种制备I式环状
脲类杀菌剂的方法,该方法涉及(1)制备如示的适用于农业的前体组合物(2)将来自前体组合物的IV式
肟与III式化合物反应,以提供II式化合物,(3)将II式化合物与MOR.sup.1式化合物反应。 ##STR2## 适当的R.sup.1-R.sup.5、R.sup.7、R.sup.8和Lg在说明书中指示。