3-Oxobenzofuranyl-2-idenyl, haloacetic acids

Claim 1

A compound of the formula I ##STR52## in which X is chlorine, bromine or fluorine, two of R 1 to R 4 independently of one another are hydrogen or lower alkyl, one of R 1 to R 4 is hydrogen, a halogen atom, hydroxyl or lower alkyl, and the last of R 1 to R 4 is hydrogen, a halogen atom, hydroxyl, carboxyl, lower alkyl, lower alkoxy, phenoxy, cycloalkyl of 5 to 8 carbon atoms, benzoyl; benzoyl substituted with alkyl of 1 to 4 carbon atoms, with alkoxy of 1 to 4 carbon atoms or with halogen; alkanoyl of 2 to 7 carbon atoms, amino, --NQ 1 Q 2 or --NHCOQ 3 ; wherein Q 1 is hydrogen or lower alkyl, Q 2 is lower alkyl; or Q 1 and Q 2 together are alkylene of 4 to 7 carbon atoms, thiaalkylene of 4 to 7 carbon atoms, oxaalkylene of 4 to 7 carbon atoms or iminoalkylene of 4 to 7 carbon atoms where the imino group --NQ 4 -- has Q 4 as hydrogen or lower alkyl, and Q 3 is lower alkyl; or if two of R 1 to R 4 are hydrogen, the remaining two of R 1 to R 4 together are alkylene of 3 to 5 carbon atoms, which may be substituted by alkyl of 1 to 4 carbon atoms, which together with the bonding C atoms in the ortho-position form a cycloalkyl group having 5 to 7 ring members which may be substituted by alkyl of 1 to 4 carbon atoms; or together are 1,4-butadienyl which together with the bonding C atoms in the ortho position form a fused benzene ring.