First Lewis Acid Catalyzed Generation and Reaction of α‐Organylsulfanyl and α‐Organylselanyl Carbenium Ions Using Ethyl α‐Fluoroacetate Derivatives

Lewis acid catalyzed generation and reactions of α‐organylsulfanyl and α‐organylselanyl carbenium ions with nucleophiles proceeded in high yields using α‐fluoro‐α‐organylsulfanyl‐ and α‐fluoro‐α‐organylselanylacetate and 5 mol‐% scandium triflate. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)