ACARICIDAL,LARVICIDAL AND OVICIDAL TETRAZINE DERIVATIVES AND COMPOSITIONS,PROCESSES FOR THEIR PREPARATION AND METHODDS OF USING THEM

摘要

The substituted tetrazines of the formula: IMAGE (I) and of the formula: IMAGE (II) wherein: R1, R2 and R4 each represent hydrogen, phenyl, alkyl of 1 to 6 carbon atoms, or alkenyl or alkynyl of 3 to 6 carbon atoms, each of which may be unsubstituted or substituted by one or more halogen atoms, hydroxy groups, cyano groups, carboxy groups, alkoxycarbonyl groups of 2 to 5 carbon atoms, or alkoxy groups of 1 to 4 carbon atoms; or R1 and R2 together represent a single bond; R3 represents alkyl of 1 to 6 carbon atoms, cycloalkyl of 3 to 7 carbon atoms, phenyl or phenylalkyl of 7 to 10 carbon atoms, each of which may be unsubstituted or substituted by one or more halogen atoms, alkyl or alkoxy groups of 1 to 6 carbon atoms, nitro groups, cyano groups, mercapto groups, or alkylmercapto groups of 1 to 4 carbon atoms; and R6 represents a phenyl group substituted in at least the 2-position by fluorine, chlorine, bromine or iodine; are effective to combat acarids and their eggs.