Die Strukturen der mittleren Ringverbindungen XV. 6‐Ketononanolid (Oxacyclodeca‐2,7‐dion)

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Abstract
Crystals of 6‐ketononanolide (oxacyclodeca‐2,6‐dione) are orthorhombic, a = 8.886, b = 16.407, c = 11.965 Å, space group Pbca, with 8 molecules in the unit cell. The structure has been solved with the help of direct methods and refined by full‐matrix least‐squares analysis of three‐dimensional intensity data. The conformation of the ring is similar to that previously observed in several cyclodecane derivatives, with the ring oxygen and carbonyl groups so situated as to minimize the number of transannular H … H contacts. Evidence for transannular O(ether) … C(carbonyl) donor‐acceptor attraction is discussed.