Microbiocidally active benzoxaboroles
Compounds of formula (I) are as defined in the claims, and their use in compositions and methods for the control and/or prevention of microbial infection, particularly fungal infection, in plants and to processes for the preparation of these compounds.
1. A compound of Formula I-a
wherein
R a is H;
R b is fluorine, chlorine, methyl or ethyl; and
R c is H, fluorine, chlorine, bromine; and
R is H, C 1-5 -alkyl, C 1-5 -alkylacyl, acetyl, formyl,
or an agronomically acceptable salt, stereoisomer, diastereoisomer, enantiomer, tautomer, atriopisomer or N-oxide thereof.
2. A composition for controlling and protecting against phytopathogenic microorganisms, comprising a compound of formula I-a as defined in claim 1 and at least one auxiliary.
3. A composition comprising a fungicidally effective amount of a compound of formula I-a as defined in claim 1 , optionally comprising at least one additional active ingredient.
4. A compound of formula (I)
wherein
R a is H;
R b is fluorine, chlorine;
R c =H, fluorine, chlorine, C 1 -C 2 alkoxy or C 1 -C 2 haloalkoxy; and
R is ethyl, methyl, propargyl, C(O)R′; wherein R′ is C 2 -C 6 alkyl; and wherein R does not form a ring with either R b or R c ;
or an agronomically acceptable salt, stereoisomer, diastereoisomer, enantiomer, tautomer, atriopisomer or N-oxide thereof.
5. A compound of formula (I) according to claim 4 , wherein
R a is H;
R b is chlorine or fluorine;
R c =H, fluorine or chlorine; and
R is ethyl, methyl or propargyl.
6. A compound of formula (I) according to claim 4 , wherein the compound of formula (I) has the formula I-b
wherein
R a is H;
R b is fluorine, chlorine;
R c =H, fluorine, chlorine; and
R is H, C 2 -C 6 alkyl.
7. A method of controlling or preventing infestation of useful plants by phytopathogenic microorganisms, wherein a compound of formula I-a as defined in claim 1 as active ingredient, is applied to the plants, to parts thereof or the locus thereof.
8. A method of controlling phytopathogenic diseases on useful plants or plant propagation material thereof, which comprises applying to said plant propagation material a fungicidally effective amount of a plant propagation material protecting composition comprising a compound of formula I-a as defined in claim 1 together with a suitable carrier therefor.