Ti(lll)-Catalyzed Cyclizations of Ketoepoxypolyprenes: Control over the Number of Rings and Unexpected Stereoselectivities. - Morcillo, Sara P.; Miguel, Delia; Resa, Sandra; Martín-Lasanta, Ana; Millán, Alba; Choquesillo-Lazarte, Duane; García-Ruiz, Juan M.; Mota, Antonio J.; Justicia, José; Cuerva, Juan M. (Journal of the American Chemical Society, 2014)