Absolute configuration of (1R,3S,8R,11R)-3,7,7,10-tetra­methyl­tri­cyclo­[6.4.0.0^1,3]dodec-9-en-11-ol

The absolute configuration of the title compound, C₁₆H₂₆O, was determined as (1R,3S,8R,11R) based mainly on the synthetic pathway but is also implied by the X-ray analysis. The mol­ecule contains fused six- and seven-membered rings. Part of the seven-membered ring was refined as disordered over two sets of sites with the occupancy ratio fixed at 0.86:0.14. The disorder corresponds to a major chair conformation and a minor boat conforation. In the crysyal, O—H...O hydrogen bonds connect the mol­ecules into chains parallel to the a axis.

Absolute configuration of (1S,3R,8R)-10-bromo­methyl-2,2-di­chloro-3,7,7-tri­methyl­tri­cyclo­[6.4.0.0^1,3]dodec-9-ene

The absolute configuration of the title compound, C₁₆H₂₃BrCl₂, has been deduced from the chemical pathway and fully confirmed by refinement of the Flack and Hooft parameters. The six-membered ring adopts a half-chair conformation, whereas the seven-membered ring is a twisted chair. The mol­ecular packing within the crystal is stabilized only by van der Waals inter­actions.

2-Isopropyl-4-meth­oxy-5-methyl­phenyl acetate

In the title compound, C₁₃H₁₈O₃, the benzene ring is almost perpendicular to the acet­oxy plane, making a dihedral angle of 89.33 (11)°. In the crystal, mol­ecules are linked by weak C—H...O hydrogen bonds, forming a zigzag chain along the c-axis direction.