| 摘要 |
A process for the preparation of 1,1,2,3- tetrachloropropene (1230xa), 1,2,3,3-tetrachloropropene (1230xd) or a mixture or composition thereof, comprising the chlorination of 1,1,3-trichloroacetone (TCA) with a nucleophilic chlorinating agent. Preferred nucleophilic chlorinating agents include phosphorous pentachloride, thionyl chloride and triaryl phosphine dichlorides. The 1230xa may be used in the preparation of 2,3,3,3-tetrafluoropropene (1234yf) by converting the 1230xa to 2-chloro-3,3,3-trifluoro-1-propene (1233xf) by reaction with HF, converting the 1233xf into 1,1,1,2-tetrafluoro-2-chloropropane (244bb) by reaction with HF and then converting the 244bb to 1234yf by the removal of HCl. The 1230xd may also be used in the preparation of a hydrofluoroolefin such as 1234yf. |
