4-Bromo­methyl-6-tert-butyl-2H-chromen-2-one

In the crystal structure of the title compound, C₁₄H₁₅BrO₂, weak C—H...O inter­actions link the mol­ecules into zigzag chains extending along the c-axis direction. These chains are further assembled into (100) layers via π–π stacking inter­actions between inversion-related chromenone fragments [inter­planar distance = 3.376 (2) Å].

2-Tri­fluoro­methyl-10H-benzo[4,5]imidazo[1,2-a]pyrimidin-4-one

In the mol­ecule of the title compound, C₁₁H₆F₃N₃O, the three fused rings of the benzo[4,5]imidazo[1,2-a]pyrimidine unit are essentially coplanar, the maximum deviation from the mean plane being 0.096 (2) Å. In the crystal, N—H...O hydrogen bonds link the mol­ecules into chains running along the b-axis direction.