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Abstract

Novel pyrimidin-4-one and pyrimidin-4-thione derivatives of formula I ##STR1## wherein A is phenyl, thienyl (including all 3 isomers), thiazolyl, pyridyl or pyridazinyl; X is oxygen or sulfur; R.sub.1 is hydrogen, halogen or trimethylsilyl, R.sub.2 is hydrogen, halogen or trimethylsilyl; at least one of R.sub.1 and R.sub.2 is not hydrogen; R.sub.3 is C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkenyl, C.sub.1 -C.sub.8 alkinyl which are unsubstituted or mono to tri-substituted by C.sub.3 -C.sub.6 cycloalkyl, halogen, C.sub.1 -C.sub.6 alkoxy or C.sub.1 -C.sub.6 haloalkoxy; O--C.sub.1 -C.sub.6 alkyl, O--C.sub.2 -C.sub.6 alkenyl, O--C.sub.2 -C.sub.6 alkynyl, which are unsubstituted or mono to tri-substituted by C.sub.3 -C.sub.6 cycloalkyl, halogen or C.sub.1 -C.sub.6 alkoxy; N--C.sub.1 -C.sub.6 alkyl; or N.dbd.CHC.sub.1 -C.sub.6 alkyl; R.sub.4 is C.sub.1 -C.sub.8 alkyl, C.sub.1 -C.sub.8 alkeanyl, C.sub.1 -C.sub.8 alkinyl which are unsubstituted or mono to tri-substituted by C.sub.3 -C.sub.6 cycloalkyl, halogen, cyano, C.sub.1 -C.sub.6 alkoxy or C.sub.1 -C.sub.6 haloalkoxy; C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkoxy; C.sub.1 -C.sub.4 alkoxy-C.sub.1 -C.sub.4 alkylthio; nitro; --CO--C.sub.1 -C.sub.6 alkyl; C.sub.3 -C.sub.6 cycloalkyl; or phenyl, which is unsubstituted or mono to tri-substituted by halogen, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl, C.sub.1 -C.sub.6 alkoxy, C.sub.1 -C.sub.6 haloalkoxy, cyano, nitro, amino, mono-C.sub.1 -C.sub.6 alkylamino, di-C.sub.1 -C.sub.6 alkyl-amino, C.sub.1 -C.sub.6 alkylthio, phenyl or phenoxy and in which the phenyl part is unsubstituted or mono to tri-substituted by halogen, C.sub.1 -C.sub.6 alkyl, C.sub.1 -C.sub.6 haloalkyl, C.sub.1 -C.sub.6 alkoxy or C.sub.1 -C.sub.6 haloalkoxy. The novel compounds have plant-protective properties and are suitable for protecting plants against infestation by phytopathogenic microorganisms, in particular fungi.

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