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The X-ray crystal structures of a) chromenopyrroledione 5 g and b) thiochromenopyrroledione 5 i. Selected bond lengths, bond angles and torsion angles: 5 g: C3–C4 1.517(2) Å, C11–C12 1.508(2) Å, C2-C3-C4 112.5(1)°, C11-C12-C13, 110.2(1)°, H3-C3-C12-H12 1.3(2)°; 5 i: C3–C4 1.52(2) Å, C11–C12 1.53(1) Å, C2-C3-C4 111.2(9)°, C11-C12-C13, 108.2(9)°, H3-C3-C12-H12 10.0(1)°.
