V-Triazolyl-[4,5-d]-pyrimidines

A v-triazolyl-[4,5-d]-pyrimidine of the formula ##STR38## wherein R.sub.1 is alkyl of 1 to 12 carbon atoms, alkoxyalkyl containing a total of 3 to 8 carbon atoms, alkenyl of 3 to 6 carbon atoms, phenyl which is unsubstituted or substituted by 1 to 3 members selected from the group consisting of halogen;

• alkyl or alkoxy each of 1 to 4 carbon atoms, or is a group of the formula ##STR39## wherein each of R.sub.4, R.sub.5 and R.sub.6 independently is alkyl of 1 to 4 carbon atoms, n is an integer from 2 to 6 and X.sup..crclbar. is chloride, bromide, iodide, alkylsulfate, unsubstituted phenylsulfonate or phenylsulfonate ion substituted by halogen, lower alkyl groups or both halogen and lower alkyl groups;
• R.sub.2 is alkyl of 1 to 12 carbon atoms, hydroxyalkyl of 2 to 6 carbon atoms or dialkylaminoalkyl containing 1 to 4 carbon atoms in each alkyl moiety;
• R.sub.3 is hydrogen, alkyl of 1 to 12 carbon atoms or hydroxyalkyl of 2 to 6 carbon atoms, or R.sub.2 and R.sub.3 together with the nitrogen atom to which they are attached complete a pyrrolidine, piperidine, piperazine or morpholine ring, which can be unsubstituted or substituted by alkyl of 1 to 4 carbon atoms, the piperazine ring being optionally substituted in the 4-position also by hydroxyalkyl of 1 to 4 carbon atoms;
• Z.sub.1 is hydrogen, alkyl of 1 to 6 carbon atoms, alkoxy of 1 to 6 carbon atoms, alkenyloxy of 3 to 6 carbon atoms, hydroxyalkyl of 2 to 4 carbon atoms, alkoxyalkyl containing a total of 3 to 8 carbon atoms, benzyloxy, phenethoxy, halogen, phenoxy, phenoxyalkoxy containing 1 to 3 carbon atoms in the alkyl moiety, or is the group ##STR40## Z.sub.2 is hydrogen, alkyl of 1 to 4 carbon atoms, alkoxy of 1 to 4 carbon atoms or halogen, or Z.sub.1 and Z.sub.2 in the ortho-position to each other together are also the methylenedioxy, ethylenedioxy or methyleneoxymethyleneoxy radical.