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The title compound, C 13 H 14 N 4 O, was developed using the reaction of salicylaldehyde and 3-amino-5-cyclobutyl-1,2,4-triazole in ethanol under microwave irradiation. This eco-friendly microwave-promoted method proved to be efficient in the synthesis of 2-{[( E )-(3-cyclobutyl-1 H -1,2,4-triazol-5-yl)imino]methyl}phenol in good yields and purity. The title compound is a Schiff base that exists in the phenol–imine tautomeric form and adopts an  E  configuration. The three independent molecules in the asymmetric unit ( A ,  B  and  C ) are not planar, the cyclobutyl and the phenol-imine rings are twisted to each other making a dihedral angle of 67.8 (4)° in molecule  A , 69.1 (2)° in molecule  B  and 89.1 (2)° in molecule  C . In each molecule an intramolecular O—H...N hydrogen bond is present, forming an  S (6) ring motif. A Hirshfeld surface analysis was performed to investigate the contributions of the different intermolecular contacts within the supramolecular structure. The major interactions are H...H (53%), C...H (19%) and N...H (17%) for molecule  A , H...H (50%), N...H (20%) and C...H (20%) for molecule  B  and H...H (57%), C...H (14%) and N...H (13%) for molecule  C .

Crystal structure and Hirshfeld surface analysis of 2-{[(E)-(3-cyclobutyl-1H-1,2,4-triazol-5-yl)imino]methyl}phenol