Organic compounds -- part of the class 532-570 series – Organic compounds – Halogen containing
Reexamination Certificate
2007-07-11
2011-10-25
Parsa, Jafar (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Halogen containing
Reexamination Certificate
active
08044252
ABSTRACT:
A process is disclosed to increase the Z/E ratio of 1,2,3,3,3-pentafluoropropene. The process involves contacting a starting material comprising 1,2,3,3,3-pentafluoropropene with a catalyst on AlF3or carbon, wherein the catalyst is selected from the group consisting of SbClwF5-w, TiClxF4-x, SnClyF4-yand TaCl2F5-zwherein w is from 0 to 4, x is from 0 to 3, y is from 0 to 3, z is from 0 to 4, to obtain a product wherein the Z/E ratio of 1,2,3,3,3-pentafluoropropene is increased relative to the Z/E ratio of 1,2,3,3,3-pentafluoropropene in the starting material.A process is also disclosed to decrease the Z/E ratio of 1,2,3,3,3-pentafluoropropene. The process involves contacting a starting material comprising 1,2,3,3,3-pentafluoropropene with a catalyst on AlF3or carbon, wherein the catalyst is selected from the group consisting of SbClwF5-w, TiClxF4-x, SnClyF4-yand TaClzF5-zwherein w is from 0 to 4, x is from 0 to 3, y is from 0 to 3, z is from 0 to 4, to obtain a product wherein the Z/E ratio of 1,2,3,3,3-pentafluoropropene is decreased relative to the Z/E ratio of 1,2,3,3,3-pentafluoropropene in the starting material.
REFERENCES:
patent: 3398204 (1968-08-01), Gallant
patent: 3914167 (1975-10-01), Ivy et al.
patent: 4978649 (1990-12-01), Surovikin et al.
patent: 5136113 (1992-08-01), Rao
patent: 5268122 (1993-12-01), Rao et al.
patent: 9833755 (1998-08-01), None
Burton D J et al: “Preparation of E-1,2,3,3,3-Pentafluoropropene, Z-1,2,3,3,3-Pentafluoropropene and E-1-Iodopentafluoropropene”, Journal of Fluorine Chemistry, Elsevier, Amsterdam, NL, vol. 44, No. 1, Jul. 1, 1989, pp. 167-174, Lausanne, CH, XP000008378, p. 167, second equation; p. 169, “Preparation of Z-1,2,3,3,3-pentafluoropropene”.
Clot, Eric et al: “Defluorination of Perfluoropropene Using Cp2ZrH2 and Cp2ZrHF: A Mechanism Investigation from a Joint Experimental-Theoretical Perspective”, Journal of the American Chemical Society, vol. 126, No. 17, 2004, pp. 5647-5653, XP002459919, p. 5648, “equation (4)”.
Heng-Dao Quan et al: “SbF5/PAF-a novel fluorinating reagent in preparing fluorine compounds”, Journal of Fluorine Chemistry, Elsevier, 125 (2004) pp. 1169-1172.
Prog. Solid St. Chem., vol. 26, pp. 97-153, “Fluorinated Metal Oxides and Metal Fluorides As Heterogeneous Catalysts”, Dr. Erhard Kemnitz and Dr. Dirk Henning Menz, Elsevier Science Ltd, Great Britain, 1998.
Nappa Mario Joseph
Rao Velliyur Nott Mallikarjuna
Toton Donald J.
E.I. du Pont de Nemours and Company
Parsa Jafar
LandOfFree
Catalytic isomerization between E and Z isomers of... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Catalytic isomerization between E and Z isomers of..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Catalytic isomerization between E and Z isomers of... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4296695