3-(3,4-dihydro-2H-benzo [1,4]oxazin-6-yl)-1H-Pyrimidin-2,4-dione compounds as herbicides

A compound of formula I

• wherein
• R1 is hydrogen or halogen;
• R2 is hydrogen, C1-C6-alkyl, C1-C6-haloalkyl, C3-C6-cycloalkyl, C3-C6-alkenyl, C3-C6-haloalkenyl, C3-C6-alkynyl, C3-C6-haloalkynyl, C1-C6-alkoxy or C3-C6-cycloalkyl-C1-C6-alkyl;
• R3 is hydrogen or halogen;
• R4 is halogen;
• R5 is hydrogen, NH2, C1-C6-alkyl or C3-C6-alkynyl;
• R6 is hydrogen, C1-C6-alkyl or C1-C6-haloalkyl;
• R7 is hydrogen or C1-C6-alkyl;
• X is O or S;
• and
• Y is O or S;
• or an agriculturally acceptable salt.

A compound of formula II

• wherein
• R1 is hydrogen or halogen;
• R2 is hydrogen, C1-C6-alkyl, C1-C6-haloalkyl, C3-C6-cycloalkyl, C3-C6-alkenyl, C3-C6-haloalkenyl, C3-C6-alkynyl, C3-C6-haloalkynyl, C1-C6-alkoxy or C3-C6-cycloalkyl-C1-C6-alkyl;
• R3 is hydrogen or halogen;
• R4 is halogen;
• X is O or S;
• Y is O or S;
• and
• L2 is C1-C6-alkoxy, C1-C6-alkylthio or aryloxy, wherein the aryl moiety may itself be partly or fully halogenated and/or may be substituted by from one to three radicals from the group of cyano, nitro, C1-C4-alkyl, C1-C4-alkoxy and C1-C4-alkylthio.