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Abstract
It was found that in the reaction of sulfenyl and selenenyl chlorides with 2–(1,2-alkadienyl)-1,3,2-dioxaphospholane-2-oxides cyclization occurred to give 2-oxo-1,2-oxaphosphol-3-ene derivatives. The sulfenyl chlorides with the cyclic esters also afford 1,2-adducts in temperature dependent amounts.