PROCESS FOR THE PREPARATION OF 3-CARBAMOIL-4-HYDROXY-CUMARINES, PRAGUIDIC COMPOSITES, PROCESS FOR THE COMBAT WITH PARASITES AND FOR THE PREPARATION OF PRAGUIDIC COMPOSITES

摘要

Novel 3-carbamoyl-4-hydroxycoumarins of the formula I IMAGE in which X, R1, R2 and n have the meaning indicated in the description. They are obtained when 4-hydroxycoumarins are reacted with isocyanates in the presence of a diluent and in the presence of a base. The novel 3-carbamoyl-4-hydroxycoumarins of the formula (I) have potent pesticidal properties, in particular insecticidal properties.