Chlorine → 1-Chloro-1,1,3,3,3-pentafluoropropane
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[C:1]([CH2:5][CH:6]([F:8])[F:7])([F:4])([F:3])[F:2].[Cl:9]Cl>>[C:1]([CH2:5][C:6]([Cl:9])([F:8])[F:7])([F:4])([F:3])[F:2]참가 물질
3
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- 온도
- 0 °C
실험 절차
The reactor described above was cooled and maintained at about 0° C. during the photochlorination reaction. Initially, the reactor was purged of air using nitrogen. Chlorine gas was then introduced to displace the nitrogen. Thereafter, 335 g (2.5 mol) of CF3CH2CHF2 (HFC-245fa) was charged to the reactor. A total of 208 g (2.9 mol) of chlorine gas was bubbled into the CF3CH2CHF2 over a period of about 24 hours while the reactants were being irradiated. At the end of the 24 hour period, GC analysis indicated a 96% conversion of HFC-245fa (retention time 1.9 min) to the desired product HCFC-235fa (retention time 2.1 min). The reaction mixture was washed with 100 mL of a cooled (about 2° C.) solution of aqueous sodium bisulfite (10 wt. %) and distilled (boiling point=26-28° C.) to afford 383 g CF3CH2CF2Cl (yield, 91%). Absent cooling of the wash solution, loss of product by vaporization has been observed due to a slight exotherm during the washing step. No multichlorinated products were detected.