| abstract |
NEW MATERIAL: Compd. of formula I [wherein R 1 -R 4 are each H, an alkyl, a halogen; R 5 is H, an alkali metal, an alkenyl, an alkynyl, an indanyl, an alkylbenzyl, a phenoxybenzyl, a (substd.) aryl, a (substd.) heteroaryl, etc.; A is carbonyl, thiocarbonyl, methylene; B is O, S, NR 6 (wherein R 6 is H, an alkyl, a cycloalkyl, a phenyl, etc.)]. n EXAMPLE: 2-(2,2-difluorocyclopropyl)-acetic acid benzyl ester. n USE: Pesticides. Especially against insects and acarids. n PROCESS: An acid halide of formula II (wherein X is Cl or Br) and an alcohol of formula III or an amine are reacted together, if necessary, in a solvent and in the presence of an acid acceptor to obtain a compd. of formula I wherein A is carbonyl. n COPYRIGHT: (C)1990,JPO |