United States Patent (19) 11 Patent Number: 5,011,997 Hazen Et Al
United States Patent (19) 11 Patent Number: 5,011,997 Hazen et al. (45) Date of Patent: Apr. 30, 1991 54 PROCESS FOR 2,822,396 2/1958 Dent ............................... 564/414 X BIS(4-AMINOPHENYL)HEXAFLUOROPRO. 3,897,498 7/1975 Zengel et al. ....................... 564/44 PANE 3,904,69 9/1975 Carnmam et al. ............. 564/414 X 4,082,749 4/1978 Quadbeck-Seeger et al. ..... 564/44 (75) Inventors: James R. Hazen, Coventry; William X R. Lee, E. Providence, both of R.I. 4,198,348 4/1980 Bertini et al. ....................... 564/44 (73) Assignee: Hoechst Celanese Corp., Somerville, OTHER PUBLICATIONS N.J. Houben-Weyl, "Stickstoff Verbindungen', Methoden 21 Appl. No.: 105,857 der Organischen Chemie, vol. 10, Part 3, pp. 375–377 (1965). 22 Fied: Oct. 7, 1987 Primary Examiner-Glennon H. Hollrah 51 Int. C. ................... CO7C 211/50; CO7C 209/50 Attorney, Agent, or Firm-Perman & Green (52) U.S.C. .................................... 564/335; 564/330; 564/414 57 ABSTRACT 58 Field of Search ............... 564/330, 158, 335, 181, This invention is an improved process for preparing 564/.414 2,2-bis(4-aminophenyl)hexafluoropropane which com prises subjecting 2,2-bis(4-aminocarbonylphenyl)hexa 56) References Cited fluoropropane to the Hofmann reaction and then treat U.S. PATENT DOCUMENTS ing that reaction product under reducing conditions to 902,150 0/1908 Heidenreich ................... 564/414 X produce the desired amine in high yield. 1,850,526 3/1932 Zitscher .......................... 564/.414 X 2,334,201 11/1943 Kamm et al. ................... 564/414 X 7 Claims, No Drawings 5,011,997 1.
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