Abstract: Triazolopyrimidines of the formula I in which the substituents are as defined below: R1, R2 are hydrogen, alkyl, haloalkyl, cycloalkyl, halocycloalkyl, alkenyl, haloalkenyl, cycloalkenyl, halocycloalkenyl, alkynyl, haloalkynyl or phenyl, naphthyl or a five- or six-membered saturated, partially unsaturated or aromatic heterocycle which contains one to four heteroatoms from the group consisting of O, N and S, R1 and R2 together with the nitrogen atom to which they are attached may also form a five- or six-membered heterocyclyl or heteroaryl which is attached via N and may contain a further heteroatom from the group consisting of O, N and S as ring member and may be substituted as defined in the description; L is halogen, cyano, alkyl, haloalkyl, alkoxy, alkenyloxy or alkoxycarbonyl; m is 1, 2, 3 or 4, where the groups L may be different if m is greater than 1; X is halogen, cyano, alkyl, haloalkyl, alkoxy or haloalkoxy; Processes and intermediates for preparing these compounds, compositions comprising the