Lewis acid-base titrations employing megacycle-frequency oscillators : Part III. Preparation, isolation and characterization of some adducts predicted from titration curves

Abstract

Adducts of stannic chloride with thirteen oxygen bases, isolated as solids from benzene or heptane solution, were characterized by analysis and melting point behavior; several of these are new compounds. Diethyl ether, n-dibutyl ether and tetrahydrofuran form AB 2 adducts; p-dioxane, in conformity with its being a diacid base, forms only a 1 : 1 species. Methyl, ethyl, n-propyl and n-butyl alcohols form simple AB 2 adducts at room temperature which on recrystallization from boiling solvent give SnCl 3(OR)ROH; iso-propyl alcohol gives only the AB 2 adduct; tert.-butyl alcohol only forms SnCl 3. OC 4H 9 (steric hindrance probably prevents formation of the AB2 adduct). Water gives a AB 4 or AB 5 adduct. Adducts of aluminum chloride with three nitrogen bases were similarly prepared from acetonitrile solution. Pyridine forms a 1 : 1 species. Acetonitrile itself forms a AB 2 species. Piperidine forms a AB 3 species. The latter two adducts support the view that AlCI 3 can form other than 1 : 1 adducts with nitrogen bases.