A new attempt was investigated to utilize inorganic solid acids and bases for the promotion of the reaction of cyanotrimethylsilane (Me 3 SiCN) with carbonyl compounds. Strongly acidic solids, such as Sn 4+ ion-exchanged montmorillonite (Sn-Mont) and Fe 3+ ion- exchanged montmorillonite (Fe-Mont), as well as basic solids, such as calcium fluoride (CaF 2), hydroxyapatite (HAp), calcium oxide (CaO), and magnesium oxide (MgO), catalyzed ...