Titanocene(III) mediated radical cyclizations of epoxides for the synthesis of medium-sized cyclic ethers

Titanocene(III) chloride (Cp2TiCl) mediated 7-exo and 8-endo radical cyclizations of epoxides towards the synthesis of 7- and 8-membered cyclic ethers have been described. Titanocene(III) chloride was prepared in situ from commercially available titanocene dichloride (Cp2TiCl2) and activated zinc dust in THF.