We were the first to accomplish acid-catalyzed addition of hydrogen sulfide to aliphatic, alicyclic, aromatic–aliphatic, and aromatic ketones in the presence of hydrogen iodide generated in situ. For this purpose, a required amount of molecular iodine was dissolved in the corresponding ketone or its solution in chloroform, and hydrogen sulfide was passed through the mixture. Hydrogen iodide liberated during the process catalyzed nucleophilic ...
