The present invention relates to novel spirocyclic tetronic acid derivatives of the formula (I)in which R1, R2and R3have the meanings given in the description, to a plurality of processes for their preparation and to their use as pesticides.本發明係關於式(I)之新穎的螺環特窗酸之衍生物其中R1、R2及R3具有發明說明中所敘述之意義,多種其製備方法及其作為殺蟲劑之用途。