| 摘要 |
PURPOSE:To obtain the title compound in high yield without the need for considerable plant investment useful as an alternative to CFC-12 having concern for the ozone layer depletion by reduction of 1-chloro-1,1-difluoroethane as raw material. CONSTITUTION:The objective compound can be obtained by reduction of 1- chloro-1,1-difluoroethane as raw material. The reduction is made e.g. under light irradiation, using zinc or hydrogenation in the presence of a catalyst. When the reduction is made under light irradiation, a secondary alcohol such as isopropyl alcohol is pref. used as proton sauce. It is preferable that the reaction temperature is -20-300 deg.C and the amount of the reducing agent to be used at least stoichiometric. The starting material, 1-chloro-1,1-difluoroethane, can be prepared, for example, by fluorinating methylchloroform. |
