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US 5,081,249 AGranted
N-fluoropyridinium-Sulfonates and a process for their preparation
AssigneesSagami Chemical Research Center, Onoda Cement Co., Ltd.
InventorTeruo Umemoto
Life of this patent
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Abstract
A class of N-fluoropyridinium-sulfonates is provided along with a processw for making same. Starting pyridine sulfonic acids and acid salts are fluorine substituted at the pyridine nitrogen atom with dilute gaseous fluorine under liquid phase contacting conditions. The N-fluorine substituted products are excellent fluorinating agents which exhibit high specificity.
Claims3
N-Fluoropyridinium-sulfonates of the formula:
- ##STR7## wherein:
- one of R.sup.1 through R.sup.5 is --SO.sub.2 O.sup..crclbar. or -(lower alkylene)--SO.sub.2 O.sup..crclbar., and the other four are hydrogen atoms.
N-Fluoropyridinium-2-sulfonate.
A process for making N-fluoropyridinium-sulfonates comprising contacting dilute gaseous fluorine with a solution of a compound of the formula:
- ##STR8## wherein:
- a) one of R.sup.1 through R.sup.5 is --SO.sub.2 OM or -(lower alkylene)--SO.sub.2 OM, and the other four are hydrogen atoms;
- b) M is hydrogen atom, ammonium, or alkali metal.
Dependencies are inferred from the claim text.