title: (E)-4-Allyl-2-[(2-hydroxy-phen-yl)iminiometh-yl]-6-methoxy-phenolate.
abstract: The title compound, C(17)H(17)NO(3), crystallizes in a zwitterionic form with cationic iminium and anionic enolate groups. The zwitterion exists in a trans configuration about the C=N bond. The dihedral angle between the two benzene rings is 13.42 (7)°. The meth-oxy group is almost coplanar [C-O-C-C = 2.1 (2)°] with the attached ring whereas the allyl unit is oriented at a dihedral angle of 67.9 (1)°. An intra-molecular N-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, the mol-ecules are linked into zigzag chains along [010] by O-H⋯O hydrogen bonds. In addition, weak C-H⋯π inter-actions are observed.
authors.forename: Naser Eltaher
authors.initials: NE
authors.lastname: Eltayeb
authors.forename: Siang Guan
authors.initials: SG
authors.lastname: Teoh
authors.forename: Suchada
authors.initials: S
authors.lastname: Chantrapromma
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun