Iranian Journal of Catalysis (IJC) Silica sulfuric acid as an efficient and reusable heterogeneous catalyst for the synthesis of formamidines from the diaminomaleonitrile Volume 2 (2012) Issue 4, December 2012 2024 02 03 Silica sulfuric acid as an efficient and reusable heterogeneous catalyst for the synthesis of formamidines from the diaminomaleonitrile EN Asieh Yahyazadeh Department of Chemistry, University of Guilan, P.O. Box 41335-1914, Rasht, I.R. Iran. Sara Hadesinea Department of Chemistry, University of Guilan, P.O. Box 41335-1914, Rasht, I.R. Iran. Mohammad Saeed Daneshmandi Department of Electrical and Computer Engineering, University of Tehran, Tehran, Iran. Journal Article 2024 02 03 Silica sulfuric acid as an efficient and reusable heterogeneous catalyst has been used for the preparation of amidines 2 from formimidate 1 by reaction with aromatic amines at room temperature in good to excellent yields. Imidate was prepared by treatment of equimolar quantities of triethyl orthoformate and diaminomaleonitrile in refluxing dioxane. All the compounds were characterized fully by spectroscopic techniques.