Herbicidal tetrahydrofuran derivatives

Abstract

Compounds of the general formula ##STR1## wherein each of R.sup.1 and R.sup.2 independently represents a hydrogen atom or an optionally substituted alkyl, cycloalkyl or aryl group, or R.sup.1 and R.sup.2 together represent an optionally substituted alkylene group; each of X and Y independently represents one of the groups CR.sup.6 R.sup.7, C=O, C=N--Z, CH--NH.sub.2 ##STR2## in which n is 2 or 3; R.sup.6 represents a hydrogen atom, an optionally substituted alkyl or aryl group or a group of formula --OA in which A represents a hydrogen atom, a heterocyclyl group, an acyl group derived from a carboxylic or a substituted carbamic acid, or a group CR.sup.10 R.sup.11 R.sup.12 ; R.sup.7 represents a hydrogen atom or an optionally substituted alkyl or aryl group; Z represents a hydroxy, alkoxy, acyloxy, amino, alkylamino or dialkylamino group; R.sup.3 represents a hydrogen atom or an optionally substituted alkyl group; each of R.sup.4 and R.sup.5 independently represents a hydrogen atom or an optionally substituted alkyl group; each of R.sup.8 and R.sup.9 independently represents a hydrogen atom, an alkyl group or an aryl group; each of R.sup.10 and R.sup.11 independently represents a hydrogen atom or an alkyl group; R.sup.12 represents an alkoxyalkoxy group a heterocyclyl group, an alkoxycarbonyl group, an optionally substituted aryl group, an alkylthio group or a substituted carboxamido group; and Ar represents an optionally substituted fully unsaturated ring having 5 or 6 atoms in the ring of which one is a nitrogen atom and the remainder are carbon atoms, or the N-oxide or an acid addition salt thereof, or Ar represents an optionally substituted phenyl group; with the proviso that if both X and Y represent groups CR.sup.6 R.sup.7, at least one substituent R.sup.6 is a group --OA; exhibit useful herbicidal activity.

Dependencies are inferred from the claim text.