The PtCl2- and PtCl4-catalyzedcycloisomerization of polyunsaturatedprecursors with different O-protecting groups at the propargylic position is reported. The free hydroxy, O-(bromomethyl)dimethylsilyl, O-methyl and O-propenyl derivatives 1a–f have afforded mixtures of skeletal rearrangement products and/or polycyclic molecules incorporating a cyclopropyl ring system in variable chemical yields. Other