Abstract: 5-Halogen-6-phenyl-7-fluoroalkylamino-triazolopyrimidines of formula I: (I) in which R1 is hydrogen, fluoro, alkyl, alkenyl, alkynyl, alkadienyl, where the carbon chains of these radicals may be unsubstituted or substituted as defined in the description; R2 is hydrogen, alkyl, alkenyl, alkynyl, alkadienyl, where these radicals may be unsubstituted or substituted; R3 is fluoroalkyl or fluoroalkenyl; X is halogen; n is 0 or an integer from 1 to 4; L each independently is halogen, nitro, alkyl, haloalkyl, alkoxy or haloalkoxy. Processes for their preparation, compositions containing them and to their use for combating phytopathogenic fungi.

Abstract: 5-Halogen-6-phenyl-7-fluoroalkylamino-triazolopyrimidines of formula I: (I) in which R1 is hydrogen, fluoro, alkyl, alkenyl, alkynyl, alkadienyl, where the carbon chains of these radicals may be unsubstituted or substituted as defined in the description; R2 is hydrogen, alkyl, alkenyl, alkynyl, alkadienyl, where these radicals may be unsubstituted or substituted; R3 is fluoroalkyl or fluoroalkenyl; X is halogen; n is 0 or an integer from 1 to 4; L each independently is halogen, nitro, alkyl, haloalkyl, alkoxy or haloalkoxy. Processes for their preparation, compositions containing them and to their use for combating phytopathogenic fungi.

Abstract: The novel compounds of formula I ##STR1## (A and R.sup.1 through R.sup.4 are defined in the specification) show selective fungicidal activity. The new compounds are obtainable by a new synthetic method and processed with carriers and adjuvants to fungicidal compositions.

Abstract: The invention relates to fungicidal compositions which comprise a carrier and, as active ingredient, a dihalotriazolopyrimidine derivative of general formula (I) in which R represents an optionally substituted branched or straight-chain alkyl or alkoxy group or an optionally substituted cycloalkyl, aryl, aryloxy, or heterocyclyl group, and Hal represents a fluroine, chlorine, bromine or iodine atom; and their use as fungicides. Certain of these dihalotriazolopyrimidine derivatives are novel and a process for the preparation of these compounds is also provided.

Abstract: The novel compounds of formula I ##STR1## (A and R.sup.1 through R.sup.4 are defined in the specification) show selective fungicidal activity. The new compounds are obtainable by a new synthetic method and processed with carriers and adjuvants to fungicidal compositions.

Abstract: An effective and efficient process for the preparation of a dihaloazolopyrimidine having the structural formula ##STR1## In this process, a malonic acid ester is reacted with a heterocyclylamine to form an intermediate salt, which optionally may be acidified to form a dihydroxyazolopyrimidine; the salt or the dihydroxyazolopyrimidine is then halogenated.

Abstract: This invention relates to certain triazolopyrimidine derivatives of the general formula ##STR1## in which R.sup.1 represents an optionally substituted alkyl, alkenyl, alkynyl, alkadienyl, cycloalkyl, bicycloalkyl or heterocyclyl group; R.sup.2 represents a hydrogen atom or an alkyl group; or R.sup.1 and R.sup.2 together with the interjacent nitrogen atom represent an optionally substituted cycloalkyl or heterocyclic ring; R.sup.3 represents an optionally substituted cycloalkyl or heterocyclyl group; and R.sup.4 represents a hydrogen or halogen atom or a group --NR.sup.5 R.sup.6 where R.sup.5 represents a hydrogen atom or an amino, alkyl, cycloalkyl or bicycloalkyl group and R.sup.6 represents a hydrogen atom or an alkyl group; processes for their preparation; compositions containing such compounds and their use as fungicides.

Abstract: The invention relates to fungicidal compositions which comprise a carrier and, as active ingredient, a dihalotriazolopyrimidine derivative of general formula (I) in which R represents an optionally substituted branched or straight-chain alkyl or alkoxy group or an optionally substituted cycloalkyl, aryl, aryloxy, or heterocyclyl group, and Hal represents a fluorine, chlorine, bromine or iodine atom; and their use as fungicides. Certain of these dihalotriazolopyrimidine derivatives are novel and a process for the preparation of these compounds is also provided.

Abstract: This invention relates to certain triazolopyrimidine derivatives of formula I ##STR1## wherein R.sub.1 represents an optionally substituted alkyl, alkenyl, alkynyl, alkadienyl, cycloalkyl, bicycloalkyl or heterocyclyl group; R.sub.2 represents a hydrogen atom or an alkyl group; or R.sub.1 and R.sub.2 together with the interjacent nitrogen atom represent an optionally substituted heterocyclic ring; R.sub.3 represents an optionally substituted aryl group; and R.sub.4 represents a hydrogen or halogen atom or a group --NR.sub.5 R.sub.6 where R.sub.5 represents a hydrogen atom or an amino, alkyl, cycloalkyl or bicycloalkyl group and R.sub.6 represents a hydrogen atom or an alkyl group; processes for their preparation; compositions containing such compounds and their use as fungicides.