Application of four-membered ring chalcogenation reagents to the synthesis of new phosphorus-chalcogen heterocycles

Abstract

The reaction of four-membered ring chalcogenation reagents such as Lawesson’s reagent, 2,4-diferrocenyl-1,3,2,4-diathiadiphosphetane 2,4-disulfide (the ferrocene analogy of Lawesson’s reagent) and Woollins’ reagent with alkyl- or aryl-dithiols in refluxing toluene gave a series of five- to seven-membered organo-phosphorus-chalcogen heterocycles in 24% to 87% yields. Five representative X-ray structures confirm the formation of these five- to seven-membered heterocycles.