Process for producing 1-substituted-5 (4H) -tetrazolinones

摘要

1-Substituted-5(4H)-tetrazolinones of the formula (I) CHEM wherein R is alkyl, haloalkyl, cycloalkyl, optionally substituted phenyl or aralkyl, can be obtained in very good yields by reacting, in a polar solvent, an isocyanate of the formula R-NCO (II) with sodium azide (NaN3) in a molar ratio of 1 : 1 and in the presence of aluminium chloride (AlCl3), followed by the addition of water and a mineral acid in excess.