Herbicidal 9-arylimino-8-thia-1,6-diazabicyclo [4.3.0]nonane-7-ones (and thiones)

An herbicidal compound of the formula ##STR6## wherein W is sulfur or oxygen;

• X is bromine, chlorine, fluorine, alkyl, or haloalkyl;
• Y is bromine, chlorine, fluorine, methyl, haloalkyl, haloalkoxy, nitro, or a radical of the formula --CH.sub.2 QR.sup.8 in which Q is O, S, S(O), or S(O).sub.2 and R.sup.8 is C.sub.1 -C.sub.3 alkyl, C.sub.2 -C.sub.5 alkenyl, C.sub.3 -C.sub.5 alkynyl, phenyl, or phenyl substituted with halogen, alkyl, or haloalkyl;
• R is alkyl, haloalkyl, dialkylamino, carboxymethyl, hydroxy, phenyl, or phenyl substituted with halogen, alkyl, alkoxy, cyano, cyanomethyl, nitro, amino, phenylamino, mono- and dialkylamino, hydroxycarbonyl, alkoxycarbonyl, alkoxyalkyl, alkoxycarbonylalkyl, benzyl, or hydroxy;
• R.sup.1 is hydrogen, alkyl, benzyl, haloalkyl, alkoxy, alkynyl, alkenyl, alkoxymethyl, cyanomethyl, hydroxycarbonylmethyl, alkoxycarbonylmethyl or a group of the formula --SO.sub.2 R or --alkylene--SO.sub.2 R in which said alkylene has 1 to 4 carbon atoms and R is as defined above;
• or
• R and R.sup.1 together are a divalent alkylene radical of 3 to 10 carbon atoms;
• or
• an agriculturally acceptable base addition salt of a compound as defined above in which R or R.sup.1 is or contains an acidic proton;
• and wherein any alkyl, alkenyl, alkynyl or alkylene radical has less than 6 carbon atoms.