As a contribution towards a
study of the relative disposition of adjacent carbonyl groups in polycarbonyl compounds, the crystal structures of
1,3-diphenylpropane-1,2,3-trione (1), 1,4-diphenyl- butane-1,2,3,4-tetraone
(3), 2,4-dihydroxy-2,5-diphenylfuran-3(2H)-one
(benzoylformoin) (7) and
3,3-dihydroxy-1,4-diphenylbutane-1,2,4-trio (8) have been determined by X-ray
diffraction from diffractometer data at 295 K and
refined by least-squares techniques to residuals of 0.036 (942 'observed'
reflections), 0.029 (979), 0.067 (941) and 0.045 (1661), respectively. Crystals
of 1,3-diphenylpropane-1,2,3-trione are triclinic, P1, a 9.756(4), b 8.813(3), c 8.303(3) �,α
68.56(2), β 67.53(3), γ 89.11(3)�, Z 2. Crystals of
1,4-diphenylbutane-1,2,3,4-tetraone are monoclinic P21/c, a 10.641(2), b 8.381(2), c 14.710(4) �,
β 91.70(2)�, Z 4. 2,4-Dihydroxy-2,5- diphenylfuran-3(2H)-one also forms monoclinic crystals, P21/c, a 5.741(4), b 9.276(7), c 24.31(2) �,
β 106.26(5)�, Z 4. Crystals of 3,3-dihydroxy-1,4-diphenylbutane-1,2,4-trine
are triclinic, P1, a 13.08(1), b 12.43(1), c 8.895(8) �, α 82.54(8), β 81.87(7), γ 78.61(7)�, Z
4.
