Synthesis of 1-amino-1,3,3,5,5,-cyclohexane mesylate

A process for the crystallization and/or re-crystallization of 1-amino-1,3,3,5,5-pentamethylcyclohexane mesylate comprising reacting a mixture of 1-amino-1,3,3,5,5-pentamethylcyclohexane and methane sulfonic acid and/or 1-amino-1,3,3,5,5-pentamethylcyclohexane mesylate with anisole as a solvent or a solvent mixture of anisole and at least one additional solvent selected from the group consisting of cumene, pentane, hexane, heptane, isooctane, methyl acetate, propyl acetate, isopropyl acetate, n-butyl acetate, isobutyl acetate, methyl ethyl ketone, methyl isopropylketone, methyl isobutyl ketone, dimethyl sulphoxide, tetrahydrofuran, methyltetrahydrofuran, 1,1-diethoxypropane, 1,1-dimethoxymethane, and 2,2-dimethoxypropane to form a reaction mixture;

• allowing the reaction to proceed, and reducing the temperature of the reaction mixture to obtain the crystallized and/or re-crystallized 1-amino-1,3,3,5,5-pentamethylcyclohexane mesylate.