Abstract
Abstract This chapter discusses reactions between the thione and alkyne functional groups, subdivided into internal (intramolecular) and external (intermolecular) reactions. Many such reactions are intramolecular; surprisingly, few involve addition of thione groups to benzyne. Selectivity of additions varies from one substrate to another, and is affected by solvent polarity. The synthesized heterocycles range from four- to eight-membered ring systems with one to three heteroatoms.
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