Maleic Acid → 5-chloro-2-methyl-2,3,3a,12b-tetrahydro-1H-dibenzo[2,3:6,7]oxepino[4,5-c]pyrrole maleate

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1.38 Kg of asenapine phosphate is loaded into a reactor. Toluene (15 L) is added, and the suspension is placed under stirring. A 9% solution of sodium bicarbonate (15 L) is added by dripping. The solution is left under stirring at 25° C. for 30 minutes. The lower aqueous phase is eliminated. The organic phase is washed with water (2×7 L). The solvent is evaporated under vacuum, obtaining asenapine base (0.90 Kg) in the form of oil. Isopropanol (12 L) is loaded into the reactor and dissolved by heating at 50° C. Maleic acid (0.4 Kg) is added to the asenapine base solution at 50° C. The solution is cooled to 25° C. in approx. 2 hours. The solution is left under stirring at 25° C. for 2 hours. The product is isolated by filtration, washing with isopropanol (3 L). The product is dried under vacuum at 50° C. for 20 hours. 1 Kg of asenapine maleate is obtained.

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