The invention relates to novel triazolopyrimidines of formula (I) in which R1, R2, R3 and X have the meaning given in the description, a method for the production of said novel materials and the use thereof for combating undesired micro-organisms and animal pests. The invention further relates to novel amines of formula (IIIa) in which R4 has the meanings given in the description and method for production thereof.