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8.7ml (6 ยท 5 X 102 moles) 1,5-dibromopentane with6 g (3. 2 X 10 2 moles) Phthalimide potassium salt dissolved in 100ml of N, N- dimethylformamide andunder room temperatureit was stirred for 15hours.The solvent was distilled off under reduced pressure, The residue usingn-hexane: ethyl acetate with a volumeratio of 10: 1 eluent to carry out column chromatography, gradually increasingthe polarity to hexane: ethyl acetate with a volume ratio of 5: 1 to give a product of 6.9g(2.3X102 mol) a bromogroup substituted by Phthalimide. The product with 5. 9g (4. 7X 102 mol) of sodium sulfite, 140ml water and 85ml95% ethanol mixed reactionwas heated to 95 C for18h, the remainingsolvent was drained, and the resulting residue was mixed with 73ml ofconcentrated hydrochloric acidthen was heated to 110 C thefor 18H, it was drained, with water – 95% ethanol on the residue to carry out recrystallization to give 5-amino-1-pentylSulfonic acid 2. 7g (total yield 50%).
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Reference:
Patent; Institute of Chemistry Chinese Academy of Sciences; zhao, jingquan; DENG, HONG; XEI, JIE; (16 pag.)CN101948412; (2016); B;,
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