PROCESS FOR PRODUCING 1, 1-DICHLORO-2, 2, 3, 3, 3-PENTAFLUOROPROPANE
申请人:OKAMOTO Hidekazu
公开号:US20120004474A1
公开(公告)日:2012-01-05
To provide a process for producing, at a high content ratio, 1,1-dichloro-2,2,3,3,3-pentafluoropropane (HCFC-225ca) which is useful as e.g. a starting material to obtain 1,1-dichloro-2,3,3,3-tetrafluoropropene (CFO1214ya).
The process for producing HCFC-225ca of the present invention comprises subjecting a raw material composed of dichloropentafluoropropane (HCFC-225) including 2,2-dichloro-1,1,1,3,3-pentafluoropropane (HCFC225aa) to an isomerization reaction at a temperature of at most 290° C. in a gas phase in the presence of a metal oxide catalyst thereby to isomerize HCFC-225aa to HCFC-225ca.
The relationship between 19F chemical shifts in halogenated propanes and their structures are elucidated using MNDO calculations to determine the population of rotamers. The pairs of atoms gauche to a fluorine atom and van der Waals interaction between the two terminal substituents are responsible for the 19F chemical shifts. The differences among chemical shifts in diastereomers are also discussed
1,1,1,2,2-pentafluoro-3,3-dichloropropane and 1,1,2,2,3-pentafluoro-1,3-dichloropropane are prepared by reacting dichlorofluoromethane and tetrafluoroethylene in a solvent in the presence of a catalyst with improved conversion and selectivity.
1,1,1,2,2-Pentafluoro-3,3-dichloropropane and 1,1,2,2,3-pentafluoro-1,3-dichloropropane are prepared at a high yield and selectivity by reacting chloroform, difluorochloromethane and tetrafluoroethylene in the presence of a catalyst.
Process for preparing 1,1,1,2,2-Pentafluoro-3, 3-Dichloropropane and 1,1,2,2,3-Pentafluoro-1,3-Dichloropropane
申请人:DAIKIN INDUSTRIES, LTD.
公开号:EP0524621A1
公开(公告)日:1993-01-27
1,1,1,2,2-Pentafluoro-3,3-dichloropropane and 1,1,2,2,3-pentafluoro-1,3-dichloropropane are prepared by reacting tetrafluoroethylene a mixture of chloroform and difluorochloromethane in the presence of a catalyst selected from the group consisting of anhydrous titanium tetrachloride and a titanium chlorofluoride of the formula: TiClxFy in which x and y are independently a number of larger than 0 and smaller than 4 provided that a sum of x and y is 4, by which by-production of 2,2-dichloro-1,1,1,3,3-pentafluoropropane is suppressed.
1,1,1,2,2-五氟-3,3-二氯丙烷和 1,1,2,2,3-五氟-1,3-二氯丙烷是由四氟乙烯与氯仿和二氟氯甲烷的混合物在选自无水四氯化钛和氯氟化钛组成的催化剂存在下反应制备的:TiClxFy,其中 x 和 y 独立地为大于 0 小于 4 的数字,条件是 x 和 y 的总和为 4,通过该方法可抑制 2,2-二氯-1,1,1,3,3-五氟丙烷的副产。