A cis-Fused Decalone and a Bicyclo[4.3.1]decanone Ring System

The crystal structures of (4aα,8α,8aα)-(±)-1-oxoperhydro-8-hydroxy-naphthyl p-bromobenzoate, C₁₇H₁₉BrO₃, (2), and (±)-endo-5-hydroxy-1-methylbicyclo[4.3.1.]decan-7-one, C₁₁H₁₈O₂, (3), were determined to ascertain their relative configurations. Compound (2) has two cis-fused six-membered rings and both adopt chair conformations. Compound (3) has a bridged bicyclic ring system consisting of a six- and a seven-membered ring which both adopt chair conformations. Molecules of (3) are linked about inversion centres into dimers by O-H...O hydrogen bonds [O...O 2.844 (3) Å] involving the hydroxy and carbonyl groups.

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