1,2-Dihydro-5-(1-methylethyl)-3H-1,2,4-triazol-3-one is an intermediate in the synthesis of N-tert-Butyl-3-isopropyl-5-oxo-4,5-dihydro-1H-1,2,4-triazole-1-carboxamide (B693045) which is a metabolite of Amicarbazone (A605040); a triazolinone herbicide with a broad spectrum of weed control.