Cyclooctanol is an organic compound with the formula or . It is a colorless oily liquid with a pleasant odor. The molecule consists of 8-membered cyclooctane ring in which one of its hydrogen atoms is replaced by a hydroxyl group.

Synthesis Cyclooctanol can be obtained by hydrolysis of cyclooctyl formate.

Cyclooctanol can also be synthesized by oxidation of cyclooctane by hydrogen peroxide with polyoxometalates as catalysts in acetonitrile. The reaction byproducts are cyclooctanone and cyclooctyl hydroperoxide.

Properties It has been investigated how cyclooctanol behaves under high pressure. At around 0.4 GPa cyclooctanol becomes a solid, which is in the form of plastic crystals. At around 1.1 GPa, it becomes a normal ordered crystal phase. These phase transitions are reversible.

Under high pressure, new solid phase of cyclooctanol (phase III) is discovered and characterized as a normal crystal phase, and all other solid phases (I, II, IV) are characterized as plastic crystal phases.

Reactions Cyclooctanol reacts with diethylaminosulfur trifluoride to give fluorocyclooctane and cyclooctene.

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