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The title compound, C15H22O2, (5), has been prepared and its structure determined. At room temperature two conformations are observed, but at 193 K, the compound shows only the conformation which has 67% occupancy at room temperature. The appearance of two conformations and the low symmetry of compound (5) are in accordance with the general structural behaviour of 13-membered ring systems. meso-(5) crystallizes in the monoclinic space group I2/a. The lengths of the triple bonds are close to 1.175 Å at room temperature and 1.188 Å at 193 K. The bond angles at the triple bonds deviate by less than 7° from linear and are almost temperature independent.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks 5, meso-5, global

fcf

Structure factor file (CIF format)
Contains datablock 5

fcf

Structure factor file (CIF format)
Contains datablock cb13oh80

CCDC references: 128526; 128527

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