Abstract: The invention relates to new compounds of formula I: ##STR1## in which Ar represents a phenyl radical having one to five identical or different substituents selected from chloro or fluoro,Y, Z, Y.sub.1 and Z.sub.1, which may be identical or different, each represents a hydrogen atom, a straight-chain or branched lower alkyl radical containing 1 to 4 carbon atoms, a cyclopropyl radical, a dicyclopropylmethyl radical, a 2,2-dicyclopropylethyl radical, a 2,2-dicyclopropylethenyl radical, a 3,3-dicyclopropylpropyl radical, a 3,3-dicyclopropyl-1-propenyl radical, a straight-chain or branched alkenyl radical containing 2 to 5 carbon atoms or a phenyl radical substituted with a nitro radical,W represents a straight-chain or branched lower alkyl radical containing 1 to 4 carbon atoms,V represents an oxygen atom,U represents a methyleneoxy radical or an ethyleneoxy radical,m and n, which may be identical or different, each represents an integer which may take a value from 2 to 4, inclusive, R.sub.1 and R.sub.

Abstract: The invention relates to a process for producing new compounds of formula I: ##STR1## and isomers thereof, as well as acid addition salts thereof, in which the symbols have the meanings set forth in the specification.