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.
Romanzo pyrimidin-4-one e derivati di pyrimidin-4-thione del ## del ## STR1 di formula I in cui A è fenilico, del thienyl (tutti e 3 gli isomeri compresi), del thiazolyl, del pyridyl o del pyridazinyl; X è ossigeno o zolfo; R.sub.1 è idrogeno, alogeno o trimetilsililico, R.sub.2 è idrogeno, alogeno o trimetilsililico; almeno uno di R.sub.1 e di R.sub.2 non è idrogeno; R.sub.3 è C.sub.1 - C.sub.8 alchile, C.sub.1 - C.sub.8 alchenile, C.sub.1 - alkinyl C.sub.8 che sono non sostituiti o mono al tri-sostituito a da C.sub.3 - C.sub.6 cycloalkyl, alogeno, C.sub.1 - C.sub.6 alcossi o C.sub.1 - haloalkoxy C.sub.6; O -- C.sub.1 - C.sub.6 alchile, O -- C.sub.2 - C.sub.6 alchenile, O -- C.sub.2 - alkynyl C.sub.6, che sono non sostituiti o mono al tri-sostituito a da C.sub.3 - il cycloalkyl C.sub.6, alogeno o C.sub.1 - C.sub.6 alcossi; N -- C.sub.1 - Alchile C.sub.6; o N.dbd.CHC.sub.1 - Alchile C.sub.6; R.sub.4 è C.sub.1 - C.sub.8 alchile, C.sub.1 - C.sub.8 alkeanyl, C.sub.1 - alkinyl C.sub.8 che sono non sostituiti o mono al tri-sostituito a da C.sub.3 - C.sub.6 cycloalkyl, alogeno, ciano, C.sub.1 - C.sub.6 alcossi o C.sub.1 - il haloalkoxy C.sub.6; C.sub.1 - C.sub.4 alkoxy-C.sub.1 - C.sub.4 alcossi; C.sub.1 - C.sub.4 alkoxy-C.sub.1 - Alkylthio C.sub.4; nitro; -- CO -- C.sub.1 - Alchile C.sub.6; C.sub.3 - Cycloalkyl C.sub.6; o fenilico, che è non sostituito o mono al tri-sostituito a da alogeno, C.sub.1 - alchile C.sub.6, C.sub.1 - C.sub.6 haloalkyl, C.sub.1 - C.sub.6 alcossi, C.sub.1 - C.sub.6 haloalkoxy, ciano, nitro, amminico, mono-C.sub.1 - C.sub.6 alkylamino, di-C.sub.1 - C.sub.6 alchile-amminico, C.sub.1 - alkylthio C.sub.6, fenilico o fenossi ed in quale la parte fenilica è non sostituita o mono al tri-sostituito a da alogeno, C.sub.1 - C.sub.6 alchile, C.sub.1 - C.sub.6 haloalkyl, C.sub.1 - C.sub.6 alcossi o C.sub.1 - haloalkoxy C.sub.6. I residui del romanzo hanno proprietà pianta-protettive e sono adatti a piante di protezione contro l'infestazione dai microorganismi phytopathogenic, in particolare funghi.
