3-Methyltetrahydrofuran-3-ol

This compound is typically encountered as a clear, colorless to pale yellow liquid with a mild, pleasant ethereal odor. Its molecular formula is C5H10O2, corresponding to a molecular weight of 102.13. The boiling point is approximately 160–162 °C at atmospheric pressure, and the calculated density is around 1.02 g/cm³ at 20 °C. It is miscible with common organic solvents such as ethanol, acetone, diethyl ether, and chloroform, while exhibiting moderate solubility in water due to the polar hydroxyl group. The tertiary alcohol functionality is relatively resistant to oxidation under mild conditions but may undergo dehydration in the presence of strong acids at elevated temperatures. Storage in tightly sealed containers protected from light and moisture at ambient temperature is generally adequate, though prolonged exposure to air should be avoided. Contact with strong oxidizing agents and concentrated mineral acids may lead to decomposition.

3-Methyltetrahydrofuran-3-ol is a saturated heterocyclic alcohol featuring a tetrahydrofuran ring with both a methyl group and a hydroxyl group attached to the 3-position. The five-membered oxygen heterocycle imparts conformational flexibility while maintaining moderate ring strain, and the geminal substitution creates a quaternary carbon center bearing the tertiary alcohol. This arrangement results in increased steric hindrance around the hydroxyl, rendering it less susceptible to oxidation compared to primary or secondary alcohols. The molecule combines the hydrophilic character of the alcohol with the ethereal and hydrophobic properties of the tetrahydrofuran ring, offering a compact yet functionally dense scaffold. Its rigid but adaptable framework allows it to serve as a versatile building block for introducing chirality and modulating physicochemical properties in more complex targets.

Pharmaceutical Intermediate
In medicinal chemistry, this tertiary alcohol serves as a starting material for the synthesis of bioactive compounds targeting central nervous system disorders. The tetrahydrofuran ring is a common motif in natural products and pharmaceuticals, and the hydroxyl group enables further derivatization through esterification, etherification, or glycosylation. Its conformational rigidity can influence the three-dimensional shape of drug candidates, potentially enhancing receptor selectivity and binding affinity.

Flavor and Fragrance Industry
The compound's mild ethereal odor and structural resemblance to known aroma chemicals make it valuable as an intermediate in the preparation of fragrance ingredients. Esters and ethers derived from 3-methyltetrahydrofuran-3-ol are explored for their olfactory contributions, imparting fruity and green notes to perfume compositions and food flavorings.

Solvent and Polymer Additive
Owing to its balanced polarity and low toxicity, this alcohol is investigated as a solvent or cosolvent in formulations requiring mild reaction conditions. It can also function as a chain transfer agent or monomer modifier in ring-opening polymerization of cyclic ethers, yielding polyethers with pendant hydroxyl groups for applications in adhesives, coatings, and biomedical materials.

Organic Synthesis Building Block
As a versatile synthetic intermediate, 3-methyltetrahydrofuran-3-ol participates in diverse transformations including oxidation to the corresponding ketone, dehydration to the exo-methylene tetrahydrofuran, and nucleophilic substitution after activation of the hydroxyl group. Its quaternary carbon center makes it a valuable substrate for studying steric effects in reactions and for constructing complex natural product analogs and chiral ligands.