Tetrahydrofuran-ether compounds and herbicidal compositions

Claim 1

Tetrahydrofuran-ether compound of the formula ##STR80## wherein A is hydrogen, straight-chain or branched alkyl with 1 to 6 carbon atoms, cycloalkyl with 3-6 carbon atoms, alkenyl or alkynyl, each of up to 4 carbon atoms or phenyl optionally substituted by halogen, alkyl or alkoxy of 1 or 2 carbon atoms, or haloalkyl of up to 2 carbon atoms and up to 3 halogen atoms; B 1 , b 2 , c 1 , c 2 , d 1 and D 2 , which are selected independently of one another, each represent hydrogen, straight-chain or branched alkyl of 1 to 6 carbon atoms, alkoxyalkyl of 1 or 2 carbon atoms in each alkyl part, haloalkyl of up to 2 carbon atoms and up to 3 halogen atoms or phenyl optionally substituted by halogen, alkyl or alkoxy of 1 or 2 carbon atoms or haloalkyl of up to 2 carbon atoms and up to 3 halogen atoms; R is optionally substituted aryl of 6 to 10 carbon atoms which can carry one or more substituents selected, independently, from halogen, alkyl and alkoxy, each with 1 to 4 carbon atoms, haloalkyl, haloalkoxy and haloalkylthio, each of up to 4 carbon atoms and up to 5 halogen atoms, phenyl, phenoxy and phenoxycarbonyl (which are each optionally substituted by halogen, alkyl or alkoxy, of 1 or 2 carbon atoms or haloalkyl of up to 2 carbon atoms and up to 3 halogen atoms), alkoxycarbonyl of 1 to 4 carbon atoms in the alkyl part, the methylenedioxo group, or the trimethylene, tetramethylene or pentamethylene radical; and X is hydrogen, straight-chain or branched alkyl of 1 to 4 carbon atoms, alkenyl or alkynyl of 2 to 4 carbon atoms, haloalkyl of up to 2 carbon atoms and up to 3 halogen atoms and phenyl which is optionally substituted by halogen, alkyl or alkoxy, of 1 or 2 carbon atoms or haloalkyl of up to 2 carbon atoms, and up to 3 halogen atoms.