Substituted tetrahydrofuran herbicides

Abstract From the Canadian patent

Novel compounds of the general formula (I), wherein each of R0, R, R1, R2, and R3 independently represents a hydrogen atom or an alkyl group or R0 and R together represent an alkylene group; X represents one of the groups wherein R4 represents a hydrogen atom or an optionally substituted aryl or alkyl group and R5 represents a hydrogen atom an alkyl, group, an alkenyl group or an alkynyl 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; exhibit useful herbicidal …