2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132198We prove that there exist diffeomorphisms of tori, supported in a disc, which are not isotopic to symplectomorphisms with respect to any symplectic structure. This yields a partial negative answer to a question of Benson and Gordon about the existence of symplectic structures on tori with exotic differential structure.12 pages, AMSTeX, final versionDifferential GeometrySymplectic Geometry53C15text