High selectivity process to make dihydrofluoroalkenes

Details High selectivity process to make dihydrofluoroalkenes High selectivity process to make dihydrofluoroalkenes

C - Chemistry, Metallurgy

07

C

C07C 17/354 (2006.01) C07C 21/18 (2006.01)

Patent

CA 2722711

Disclosed is a method for the synthesis of fluorinated alkenes comprising contacting a fluorinated alkyne of the formula R1 C.ident.C R2, wherein R1 and R2 are independently selected from CF3, C2F5, C3F7, and C4F9, in a pressure vessel, with a Lindlar catalyst, with substantially one molar equivalent of hydrogen, to make the corresponding cis-alkene of formula R1 C.ident.C R2 with high selectivity, wherein said hydrogen is added in portions over a period of time, so as to produce an initial pressure in the pressure in the vessel of no more than about 100 psi.

L'invention porte sur un procédé de synthèse d'alcènes fluorés, comprenant la mise en contact d'un alcyne fluoré de formule R1 C=C R2, dans laquelle R1 et R2 sont indépendamment choisis parmi CF3, C2F5, C3F7, et C4F9, dans un récipient sous pression, avec un catalyseur de Lindlar, avec sensiblement un équivalent en moles d'hydrogène, pour préparer le cis-alcène correspondant de formule R1 C=C R2 avec une sélectivité élevée, ledit hydrogène étant ajouté par portions sur un certain laps de temps, de façon à produire une pression initiale dans le récipient, non supérieure à environ 100 psi.

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