Process and intermediates for the preparation of triazolinones

A process for preparing a triazolinone of the formula ##STR24## in which R.sup.1 represents alkyl having 1 to 6 carbon atoms which is optionally substituted by halogen, cyano or C.sub.1 -C.sub.4 -alkoxy, or represents cycloalkyl having 3 to 6 carbon atoms which is optionally substituted by halogen, cyano or C.sub.1 -C.sub.4 -alkyl, and

• R.sup.2 represents amino, a radical selected from the group consisting of alkyl, alkenyl, alkinyl, alkoxy, alkylamino or dialkylamino, each of which has up to 6 carbon atoms in the alkyl, alkenyl or alkinyl groups and each of which is optionally substituted by halogen, cyano or C.sub.1 -C.sub.4 -alkoxy, or represents a radical selected from the group consisting of C.sub.3 -C.sub.6 -cycloalkyl, C.sub.3 -C.sub.6 -cycloalkyl-C.sub.1 -C.sub.2 -alkyl or phenyl, each of which is optionally substituted by halogen, cyano, C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy or C.sub.1 -C.sub.4 -alkoxycarbonyl
• which comprises
• 1) reacting a triazolinethione of the formula ##STR25## with an oxidant at a temperature range between 0.degree. and 100.degree. C., optionally in the presence of a reaction auxiliary and a solvent;
• followed by
• 2) taking the triazolesulphonic acid ##STR26## wherein M represents hydrogen or a metal equivalent, formed in step 1 above and reacting said compound with water at a temperature range of 20.degree. C. and 120.degree. C. optionally in the presence of an acid, wherein the oxidant is selected from the group consisting of oxygen, ozone, hydrogen peroxide, chlorine, sodium hypochlorite solution, sodium permanganate, potassium permanganate, nitric acid, sodium dichromate, potassium dichromate, sodium peroxodisulphate, potassium peroxodisulphate, sodium perborate, potassium perborate, performic acid, peracetic acid, perpropionic acid and optionally halogenated perbenzoic acids, and the reaction auxilary is salt of a metal of groups IVb, Vb and VIb or a inorganic or organic base.