Solid-catalyzed synthesis of isomers–free terpinen–4–ol

•The industrially–relevant product terpinen–4–ol is produced without isomers.•The synthesis proceeds with simple solid catalysts in 66% yield.•Batch and in–flow processes are both studied at multigram scale.•The synthetic three–step sequence is 100% atom economic.•Nanotitania is a competent catalyst for the isomerization of epoxides to allyl alcohols.