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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. ÕâÊÇ·´Ó¦µÄºó´¦Àí£¬¿´²»Ã÷°× |
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