How is S-Ethyl dipropylcarbamothioate (CAS: 759-94-4) typically synthesized?

S-Ethyl dipropylcarbamothioate is typically synthesized by the reaction of diisopropyl carbamate with ethanethiol, followed by a propylation step. This can be achieved using potassium carbonate as a base, with high yield and good selectivity. The reaction is conducted in an aprotic solvent like dimethylformamide (DMF) to facilitate the nucleophilic substitution process.