Regiospecific Carbonylation and Ring Expansion of Thietanes and Oxetanes Catalyzed by Cobalt and/or Ruthenium Carbonyls

Article abstract of DOI:10.1021/jo00262a010

Dicobalt octacarbonyl and triruthenium dodecacarbonyl together catalyze the regiospecific insertion of carbon monoxide into the least substituted carbon-heteroatom bond of a thietane or oxetane, affording thiobutyrolactones or butyrolactones in fine yields.