Abstract
The title compound CI, C25H20O1, crystallizes in the monoclinic space groupCc with cell parametersa = 1.0186(2),b = 1.6327(6),c = 1.1000(4) nm, β = 99.43(2) °,Z = 4, andV = 1.8047 nm3; title compound CII, C25H20O1, crystallizes in the tetragonal space groupP42/n with cell parametersa =b = 2.4218(7),c = 0.6352(2) nm,Z = 8, and V = 3.7255 nm3. Both structures were refined by full-matrix least squares using diffractometer data to reliability indices (R) of 0.048 and 0.053, respectively. In each structure one single carbon-carbon bond, C2a-C8b, was significantly elongated (4.5 pm), otherwise the geometry observed was not unusual.
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