Jj. Devoss et Zh. Sui, SYNTHESIS OF MEDIUM-SIZE RINGS CONTAINING OXYGEN AND SULFUR BY RING EXPANSION OF HALODIOXOLANES, DIOXANES AND OXATHIOLANES, Tetrahedron letters, 35(1), 1994, pp. 49-52
Ring expansion of the readily available cyclic haloketals and halo-O,S
-ketals provides a versatile method for the synthesis of medium rings
containing sulfur and/or oxygen atoms.