Three-Membered Rings With One Selenium or Tellurium Atom

Abstract

This chapter expands upon previous reviews dealing with the structure and reactivity of seleniranes, telluriranes, selenirenes and tellurirenes. These highly reactive three-membered rings have been isolated as the iranium or irenium salts at low temperatures with a broad range of substituents on the chalcogen and ring carbons. More often they are presumed intermediates in a swathe of reactions with the last decade rapidly building upon the previously known examples with incorporation into multiple synthetic strategies toward natural products. Key applications include enantioselective and/or catalytic electrophilic cyclization, the syn-dichlorination of alkenes, conjugation of large biomolecu..