“…61 An equilibration of allylic isomers in which the leaving group returns at the allylically related carbon has also been noted.39,46,62 O-Allyl phosphorothionates equilibrate with S-allyl phosphorothiolates in the presence of 5-a type of reaction that may be useful for heteroatom interconversion. 63 Isomerization of vinyl epoxides to dienols and ß, -unsaturated ketones are envisioned to involve these intermediates.64…”