| abstract |
Compounds of the formula wherein R 'is H, halogen, alkyl or alkoxy; R 2 H, halogen, alkyl or CF 3 ; R 3 is H, Cl, Br, alkyl or CN; R 4 H, halogen, alkyl, phenyl or halophenyl and R 5 H, alkyl, alkynyl or CN are starting materials for the production of valuable insecticides of the pyrethroid type. |