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US 8,618,339 B2Granted
High selectivity process to make dihydrofluoroalkenes
AssigneeE. I. Du Pont de Nemours and Company
InventorEkaterina N. Swearingen
Life of this patent
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Abstract
Disclosed is a method for the synthesis of fluorinated alkenes comprising contacting a fluorinated alkyne of the formula R1 C≡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≡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.
Claims11
A process for hydrogenation, comprising:
- contacting a fluorinated alkyne of the formula R1 C≡C R2, wherein R1 and R2 are independently selected from CF3, C2F5, C3F7, and C4F9, with substantially one equivalent or less of hydrogen in a reaction zone, in the gas phase in the presence of a Lindlar catalyst to make a fluorinated alkene of formula R1 CH═CH R2.
Dependencies are inferred from the claim text.