Benzosultams and analogues and their use as fungicides

A compound selected from the group consisting of:

• compounds of formula (IIa) and/or salts thereof:
• wherein:
• W is CH or N;
• Y7 is a hydrogen atom or a fluorine atom;
• and
• U8 is a fluorine atom, a bromine atom, a chlorine atom, an iodine atom, a hydroxyl group, an amino group, a mesyl group, a tosyl group or a triflyl group, wherein the compound of formula (IIa) does not represent:
• 3-bromo-8-fluoro-2-methylquinoline [1259519-95-3],
• 8-fluoro-2-methylquinolin-3-ol [1314012-55-9],
• 8-fluoro-2-methylquinolin-3-amine [1259519-93-1],
• 7,8-difluoro-2-methylquinolin-3-ol [1314012-50-4],
• 5-fluoro-3-methylquinoxalin-2(1H)-one [1426822-07-2],
• 2-chloro-5-fluoro-3-methylquinoxaline [1426822-08-3], and/or
• 2-chloro-5,6-difluoro-3-methylquinoxaline [1415018-73-3], and
• compounds of formula (IIb) and/or salts thereof:
• wherein:
• Y7 is a hydrogen atom or a fluorine atom;
• and
• U9 is a fluorine atom, a bromine atom, a chlorine atom, an iodine atom, a hydroxyl group, an amino group, a mesyl group, a tosyl group or a triflyl group, wherein the compound of formula (IIb) does not represent:
• 5-fluoroquinoxalin-2(1H)-one [55687-16-6],
• 5-fluoroquinoxalin-2-amine [1895170-02-1],
• 2-chloro-5-fluoroquinoxaline [55687-09-7],
• 5,6-difluoroquinoxalin-2(1H)-one [917343-50-1], and/or
• 2-chloro-5,6-difluoroquinoxaline [1384067-26-8].