Facile synthesis of enol ethers by cleavage of α-bromoacetals and α-bromoketals mediated by SmI2

α-Bromocyclicacetals, α-bromocyclicketals and α-bromocyclicthioketals, derived from cyclic and acyclic ketones and aldehydes, reacted with samarium diiodide at −78°C in THF to furnish the corresponding enol ethers or thioenol ethers containing hydroxy or thiol moieties in high yields.