Using triazolopyrimidine derivatives as microbicides for protecting materials.

Use of compounds of formula (I) wherein R1 represents methyl, ethyl, propyl, trifluoropropyl, 2- (1, 1, 1- trifluoropropyl), benzyl, pentenyl, propinyl, cyclopropyl, cyclopentyl, trimetilciclopentilo, cyclohexyl, trimethylcyclohexyl or cyclooctyl R2 represents hydrogen, methyl or ethyl, or R1 and R2 together with the nitrogen atom to which they are attached, piperidyl, fenilpiperidilo, methylpiperdyl or azepinyl, R 3 represents phenyl, 2-fluorophenyl, 3-fluorophenyl, 4-fluorophenyl, 2- chlorophenyl, 3-chlorophenyl, 4-chlorophenyl, 2-bromophenyl, 3-bromophenyl, 4-bromophenyl, 2-chloro-6-fluorophenyl, 2, 4-difluorophenyl, 3, 4- difluorophenyl, 2, 6-difluorophenyl, 2, 4, 6-trifluorophenyl, 2, 3, 6- trifluorophenyl, 2, 4-dichlorophenyl, 3, 4-dichlorophenyl, 2, 6-dichlorophenyl, 2, 4, 6-trichlorophenyl, 2-methylphenyl, 3-methylphenyl, 4-methylphenyl, 3- butylphenyl, 4-butylphenyl, 2-methoxyphenyl, 3-methoxyphenyl, 4-methoxyphenyl, 3, 4-dimethoxyphenyl or 2, 6-difluoro-4-methoxyphenyl, and R 4 represents chlorine, their metal salts, compounds acid addition, N-oxides, isomers (R) and (S) as well as racemates, provided that a chiral center in the compounds of formula (I), as microbicide for the protection of technical materials.