1-氯-2-碘-1,1,2-三氟乙烷

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: In a transparent quartz tube having an inner volume of 300 ml, 48 g (0.20 mol) of 1-chloro-2-iodo-1,1,2-trifluoroethane and 26 g (0.24 mol) of ethyl acrylate were placed in conjunction with 100 ml of 1,1,2-trichlorotrifluoroethane and were exposed to an ulraviolet ray issuing from a spiral light source for 25 hours. After this irradiation, the solvent trichlorotrifluoroethane was expelled from the resultant mixture by distillation under normal pressure and, subsequently, the unaltered reactants were recovered by distillation under a slightly lowered pressure. By subjecting the remaining reaction mixture to vacuum distillation, there was obtained 9.5 g (0.028 mol) of ethyl 2-iodo-4,5,5-trifluoro-5-chloropentanoate of b.p. 79° to 82° C./3 mm, nD20 1.4610, d420 1.728 and νC=0 1732 cm-1. This adduct was a mixture of two diastereomers (42:58). This reaction by-produced ethyl 4,5,5-trifluoro-5-chloro-2-pentanoate due to removal of hydrogen iodide from the adduct and ethyl 4,5,5-trifluoro-5-chloropentanoate due to substitution of iodine with hydrogen, etc. in small amounts. In a transparent quartz tube having After this irradiation the solvent trichlorotrifluoroethane was expelled from the resultant mixture by distillation under normal pressure subsequently, the unaltered reactants were recovered by distillation under a slightly lowered pressure the remaining reaction mixture to vacuum distillation