This invention relates to the process for the preparation of a method for preparing derivatives of formula (I), ##STR1## wherein R is an alkyl, alkoxy, alkylthio, polyfluoroalkyl, polyfluoroalkoxy, alkenyl, phenyl, alkylsulphonyl, alkoxycarbonyl, amino, cyano, sulphonamide or dialkylcarbamyl radical, characterized in that a derivative of formula (II), ##STR2## wherein R has the same meaning as in formula (I), is reacted with nitronium tetrafluoroborate and derivatives of formula (II).
这项发明涉及一种制备公式(I)衍
生物的方法的过程,其中R是烷基、烷氧基、烷
硫基、多氟烷基、多氟烷氧基、烯基、苯基、烷基磺酰基、烷氧羰基、
氨基、
氰基、磺酰胺基或二烷基
氨基基团,其特征在于将公式(II)衍
生物,其中R的含义与公式(I)中相同,与
硝酸四
氟硼酸盐和公式(II)衍
生物发生反应。