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(57) Abstract: Formula (I) wherein Y is O, S or CH 2 ; R 1 is an optionally substituted aryl or heteroaromatic ring, wherein The substituents are selected from halogen, C 1 -C 4 alkyl, C 1 -C 4 haloalkyl, C 1 -C 4 alkoxy or C 1 -C 4 haloalkoxy; R 2 and R 3 are independently hydrogen Or R 4 and R 5 are independently selected from halogen). The compounds are useful as herbicides. Embedded image |