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US 5,286,352 AGranted
Electrochemical production of higher pentafluorosulfonyl acid fluorides
AssigneeMinnesota Mining and Manufacturing Company
InventorsJohn C. Hansen, Patricia M. Savu
Life of this patent
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Abstract
A continuous process for preparing in a Simons electrochemical cell charged with anhydrous liquid HF and a S- and H-containing organic precursor fluorochemical compounds having the formula F.sub.5 S--R.sub.f --X where X is COF or SO.sub.2 F; R.sub.f is a saturated fluoroaliphatic radical having at least 3 fully-fluorinated C atoms; and the F.sub.5 S group is bonded via a S--C bond to 1 of the 3 fully-fluorinated C atoms of the R.sub.f radical.
Claims3
A continuous process for preparing fluorochemical compounds, comprising the steps of:
- (1) charging a Simons electrochemical cell with anhydrous liquid hydrogen fluoride;
- (2) periodically charging the cell with a S- and H-containing organic precursor to form a solution of anhydrous liquid hydrogen fluoride containing the precursor;
- (3) electrolyzing the solution to produce a gaseous product mixture containing fluorochemical compounds having the formula F.sub.5 S--R.sub.f --X where X is COF or SO.sub.2 F;
- R.sub.f is a saturated fluoroaliphatic radical having at least 3 fully-fluorinated C atoms;
- and the F.sub.f S group is bonded via a S--C bond to 1 of the 3 fully-fluorinated C atoms of the R.sub.f radical.
2 more elements
The continuous process of claim 7, wherein:
- the precursor is selected from the group consisting of thiophenecarbonyl chloride, thiobutyrolactone, mercaptobenzoic acid, di-thiohexanoyl chloride, 3-methyl-2-thiophene carboxylic acid, 3-methyl-2-thiophene carboxylic acid, and 2-thiophenesulfonylfluoride.
Dependencies are inferred from the claim text.