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Gerneral Procedure for Salts Preparation.
1. A cold
alcohol solution of the product was treated with concentrated
hydrochloric acid, and the hydrochloride was obtained. The
salt was purified by absolute ethanol/ethyl ether.
2. Following the procedure of Burke et al.,41 to a solution
of the reaction mixture in propanol-1 (85% propanol-1) was
added hydrobromic acid in ethanol absolute. After 30 min of
gentle refluxing at 60 ¡ãC and cooling, ethyl ether was added
dropwise. Upon cooling and filtration, the product was obtained.
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