title: 3,3'-(Ethane-1,2-di-yl)bis-(3,4-dihydro-2H-1,3-benzoxazine).
abstract: The title compound, C(18)H(20)N(2)O(2), was prepared by Mannich-type reaction of phenol, ethane-1,2-diamine and formaldehyde. The heterocyclic rings adopt half-chair conformations. The acyclic methyl-ene groups attached to the N atoms are in an axial position. In the crystal, weak C-H⋯O hydrogen bonds link the mol-ecules into dimers. These dimers are further connected via C-H⋯π contacts.
authors.forename: Augusto
authors.initials: A
authors.lastname: Rivera
authors.forename: Jairo
authors.initials: J
authors.lastname: Camacho
authors.forename: Jaime
authors.initials: J
authors.lastname: Ríos-Motta
authors.forename: Karla
authors.initials: K
authors.lastname: Fejfarová
authors.forename: Michal
authors.initials: M
authors.lastname: Dušek