OICC Press Iranian Journal of Catalysis 2345-4865 2 3 2024 02 03 Introduction of two efficient catalysts for the synthesis of 1,8-dioxo-octahydroxanthene derivatives in the absence of solvent EN Farhad Shirini Department of Chemistry, College of Science, University of Guilan, Rasht, Iran 0000-0002-7204-5000 Gholam Hossein Imanzadeh Department of Chemistry, College of Science, University of Mohaghegh Ardabili, Ardabil, Iran. Masoumeh Abedini Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran. Maryam Akberi Dokhte-Ghaziani Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran. Mohaddeshes Safarpoor Langroodi Department of Chemistry, College of Science, University of Guilan, Rasht, zip code 41335, I.R. Iran. Parisa Ghods Ghasemabadi Department of Chemistry, College of Science, University of Mohaghegh Ardabili, Ardabil, Iran. Journal Article 2024 02 03 1,3-Dibromo-5,5-dimethylhydantoin (DBH) and benzyltriphenylphosphoniumtribromide (BTPTB) were used as efficient catalysts for the promotion of the synthesis of 1,8-dioxo-octahydroxanthene derivatives (DOXOs) via a one-pot three component condensation of aldehydes and cyclic 1,3-dicarbonyl compounds in the absence of solvent.