2 2 trifluoro 1 methyl ethyl or especially trifluoromethyl the term u201c halogenated alkoxy u201d as used herein means an alkoxy group as defined above which is substituted one or several times by halogen preferably by fluorine or chlorine especially fluorine examples are difluoromethoxy trifluoromethoxy 2 2 2 trifluoroethoxy perfluoroethoxy and the like especially trifluoromethoxy the term u201c halogen u201d as used herein means fluorine chlorine bromine and iodine preferably fluorine chlorine or bromine and more preferred fluorine and chlorine the term u201c phenylalkyl u201d as used herein means an alkyl group as defined above in which one of the hydrogen atoms is replaced by a phenyl group examples of phenylalkyl groups are benzyl 1 phenylethyl 2 phenylethyl 3 phenylpropyl and the like preferably benzyl and 1 phenylethyl the term u201c heteroaryl u201d means a mono or bicyclic aromatic ring selected from pyridyl thienyl benzimidazolyl pyrimidyl thiazolyl quinolyl pyridazinyl pyrazinyl oxazolyl quinazolinyl indolyl benzothiophenyl or benzofuranyl especially from pyridyl thienyl benzimidazolyl pyrimidyl thiazolyl quinolyl or pyridazinyl and more preferred from pyridyl thienyl or benzimidazolyl the term u201c cycloalkyl u201d means a monocyclic saturated hydrocarbon ring with 3 to 7 preferably 4 to 6 and more preferably 5 to 6 ring atoms examples of such saturated carbocyclic groups are cyclopropyl cyclobutyl cyclopentyl cyclohexyl and cycloheptyl preferably cyclopropyl cyclopentyl and cyclohexyl in the definition of r 1 u2014 y cycloalkyl is preferably u2014 y cyclopropyl in the definition of r 2 cycloalkyl is preferably cyclopropyl cyclobutyl cyclopentyl or cyclohexyl more preferably cyclopropyl cyclopentyl or cyclohexyl and still more preferably cyclobutyl cyclopentyl or cyclohexyl the term u201c heterocyclyl u201d means a.