A scalable process to produce enantiomeric R 83842, (S)-6-[(4-chlorophenyl) (1H-1,2,4-triazol-1-yl)methyl]-1-methyl-1H-benzotriazole, is developed and described as a lecture* transcript. Cheap and safe reagents have been used. A typical procedure for oxidative destruction of aqueous cyanide waste, and stability data on N-acetyl hydrazine are provided. Special focus is on cost analysis as an important tool in developing performant synthetic methods. The method consists of preparing a chiral monosubstituted hydrazine which is ring closed to the chiral 1-alkylated 1,2,4-triazole title compound.