Ferric hydrogen sulfate was used as an environmentally friendly heterogeneous acidic catalyst for the greener, 1-pot, 3-component synthesis of 1,8-dioxo-octahydroxanthene via condensation reactions between aromatic aldehydes and dimedone under solvent-free thermal and microwave irradiation as well as in aqueous media conditions in short periods of times with excellent yields. The catalyst was easily separated in simple work-up and was recycled several times without loss of reactivity under the described reaction conditions.
SHATERIAN, HAMID REZA; HOSSEINIAN, ASGHAR; and GHASHANG, MAJID
"Ferric Hydrogen Sulfate as an Efficient Heterogeneous Catalyst for Environmentally Friendly Greener Synthesis of 1,8-Dioxo-Octahydroxanthenes,"
Turkish Journal of Chemistry: Vol. 33:
2, Article 6.
Available at: https://journals.tubitak.gov.tr/chem/vol33/iss2/6