Herbicidally active novel substituted 3-trichloromethyl-1,2,4-thiadiazol-5-yl-oxyacetamides

A substituted 3-trichloromethyl-1,2,4-thiadiazol-5-yl-oxyacetamide of the formula ##STR53## in which R.sup.1 and R.sup.2, which can be identical or different, individually represent alkyl, cyanoalkyl, alkoxyalkyl, alkylthioalkyl, alkenyl, alkinyl or alkoxy, each having up to 10 C atoms, cycloalkyl or cycloalkenyl, each having up to 12 C atoms, aralkyl which has 1 or 2 carbon atoms in the alkyl part and 6 or 10 carbon atoms in the aryl part, and is optionally substituted by halogen, or represents aryl having 6 or 10 carbon atoms, it being possible for the aryl radical to be substituted by 1 to 3 halogen atoms, 1 to 3 alkyl or halogenoalkyl groups each having 1 to 4 carbon atoms, nitro, cyano or alkoxy having 1 to 4 carbon atoms,

• or wherein
• the radicals R.sup.1 and R.sup.2, together with the nitrogen atom to which they are bonded, form a partially unsaturated and/or benzofused monocyclic or bicyclic structure which has up to 15 carbon atoms and is optionally substituted by 1 to 3 alkyl groups, each having 1 to 5 carbon atoms, or by two geminal alkoxy groups, each having 1 to 3 carbon atoms,
• or wherein
• the radicals R.sup.1 and R.sup.2, together with the nitrogen atom to which they are bonded, form a saturated monocyclic structure which has up to 6 carbon atoms, is optionally substituted by 1 to 3 alkyl groups, each having 1 to 5 carbon atoms, and optionally contains in the ring a further nitrogen atom, oxygen atom or sulphur atom.