Effect of dilution of sulfuric acid, phosphoric acid and oxalic acid on the production of α-terpineol from terpin hydrate was written by Kullaj, S.. And the article was included in Buletin i Shkencave Natyrore in 1983.Reference of 2451-01-6 This article mentions the following:
Terpin hydrate(I) was dehydrated to α-terpineol(II) by boiling with 0.01-1% H2SO4, H3PO4, or oxalic acid. H3PO4 (0.025%) gave maximum yields of II (98.8%); the reaction mixture contained 72.1% of II. After distillation at 20 mm Hg through a column with 5 distillation plates, a crystalline II was obtained in a fraction boiling at 113-118°. In the experiment, the researchers used many compounds, for example, rel-(1s,4s)-4-(2-Hydroxypropan-2-yl)-1-methylcyclohexanol hydrate (cas: 2451-01-6Reference of 2451-01-6).
rel-(1s,4s)-4-(2-Hydroxypropan-2-yl)-1-methylcyclohexanol hydrate (cas: 2451-01-6) belongs to alcohols. Alcohols are weak acids. The most acidic simple alcohols (methanol and ethanol) are about as acidic as water, and most other alcohols are somewhat less acidic. Under carefully controlled conditions, simple alcohols can undergo intermolecular dehydration to give ethers. This reaction is effective only with methanol, ethanol, and other simple primary alcohols.Reference of 2451-01-6
Referemce:
Alcohol – Wikipedia,
Alcohols – Chemistry LibreTexts