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The title compound, C17H17NO2, was synthesized and its photoreactive properties in the crystalline state were investigated. A solid-state photoreaction did not occur because the reaction sites were too far apart in the mol­ecule., The title compound [systematic name: 2-oxo-N,2-diphenyl-N-(propan-2-yl)acetamide], C17H17NO2, was synthesized and its photoreactive properties in the crystalline state were investigated. In the mol­ecule, the carbonyl group attached to the phenyl ring adopts an s-trans configuration with respect to the isopropyl group. Moreover, the distance between the C atom of the carbonyl group and the N-bound C atom of the isopropyl group is 3.845 (2) Å, which is much longer than 3.2 Å, the threshold for photoreactions to take place in the mol­ecule. As a result, the crystal did not photoreact upon UV light irradiation. In the crystal, the mol­ecules are linked via weak inter­molecular C—H⋯O hydrogen bonds, forming a layer structure parallel to the ab plane.