7789-21-1 Usage
Description
Fluorosulphuric acid (FSO3H) is a colorless, free-flowing, and highly corrosive fuming liquid. It is soluble in polar organic solvents such as acetic acid, ethyl acetate, and nitrobenzene, but poorly soluble in nonpolar solvents like alkanes. FSO3H is one of the strongest known simple Bronsted acids and has a boiling point of 163°C with a density of 1.73 g/cm3. It is corrosive to metals, body tissues, and glass, and is incompatible with many metals and bases. FSO3H hydrolyzes slowly to hydrofluoric acid (HF) and sulfuric acid (H2SO4). The related triflic acid (CF3SO3H) retains the high acidity of FSO3H but is more hydrolytically stable.
Uses
Used in Organic Synthesis:
Fluorosulphuric acid is used as a catalyst in organic synthesis for its strong acidity, which allows it to dissolve almost all organic compounds that are even weak proton acceptors.
Used in Electroplating:
FSO3H is utilized in electroplating processes due to its ability to enhance the quality and efficiency of the plating process.
Used as a Fluorinating Agent:
Fluorosulphuric acid serves as a fluorinating agent in various chemical reactions, providing a source of fluoride ions for the formation of fluorinated compounds.
Used in Etching Lead Glass:
FSO3H is useful for regenerating mixtures of HF and H2SO4 for etching lead glass, which is important in the production of certain types of glassware and optical components.
Used in Isomerization and Alkylation of Hydrocarbons:
Although it is unclear if such applications are of commercial importance, FSO3H isomerizes alkanes and is used in the alkylation of hydrocarbons with alkenes.
Used as a Laboratory Fluorinating Agent:
Fluorosulphuric acid is employed as a laboratory fluorinating agent, providing a controlled and concentrated source of fluoride ions for various experimental purposes.
Air & Water Reactions
Fumes in air. Reacts violently with water to form hydrogen fluoride and sulfuric acid mist.
Reactivity Profile
FLUOROSULFONIC ACID is very strongly acidic [Merck]. Reacts exothermically with chemical bases (examples: amines, amides, and inorganic hydroxides). These reactions can generate dangerously large amounts of heat in small spaces. Reacts violently with water to generate hydrofluoric acid and sulfuric acid. Reacts with active metals, including such structural metals as aluminum and iron, to release hydrogen, a flammable gas. Can initiate the polymerization of certain alkenes. Reacts with cyanide compounds to release gaseous hydrogen cyanide. Generates flammable and/or toxic gases in contact with dithiocarbamates, isocyanates, mercaptans, nitrides, nitriles, sulfides, and strong reducing agents. Additional gas-generating reactions occur with sulfites, nitrites, thiosulfates (to give H2S and SO3), dithionites (SO2), and carbonates. May catalyze (increase the rate of) chemical reactions.
Hazard
Extremely irritating to eyes and tissue.
Health Hazard
Inhalation of fumes causes severe irritation of nose and throat. Contact of liquid with eyes or skin causes very severe burns of mouth and stomach.
Safety Profile
Probably a poison by
inhalation. A corrosive irritant to the skin,
eyes, and mucous membranes. See also
FLUORIDES, SULFURIC ACID, and
FLUOROSULFONATES.
Check Digit Verification of cas no
The CAS Registry Mumber 7789-21-1 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,7,8 and 9 respectively; the second part has 2 digits, 2 and 1 respectively.
Calculate Digit Verification of CAS Registry Number 7789-21:
(6*7)+(5*7)+(4*8)+(3*9)+(2*2)+(1*1)=141
141 % 10 = 1
So 7789-21-1 is a valid CAS Registry Number.
InChI:InChI=1/FHO3S/c1-5(2,3)4/h(H,2,3,4)
7789-21-1Relevant articles and documents
REACTION OF PEROXYDISULFURYL DIFLUORIDE WITH 2-HYDROPERFLUOROISOBUTANE
Fokin, A. V.,Rapkin, A. I.,Matveenko, V. I.,Zakharov, V. Yu.,Studnev, Yu. N.
, p. 236 (1986)
-
Novel synthetic route to perfluoroallyl cyanide (PFACN) reacting perfluoroallyl fluorosulfonate with cyanide
Tverdomed, Sergey N.,Hirschberg, Markus E.,Pajkert, Romana,Hintzer, Klaus,R?schenthaler, Gerd-Volker
, p. 65 - 69 (2018/03/21)
A novel synthetic method for the preparation of perfluoroallyl cyanide CF2[dbnd]CFCF2CN (PFACN) is presented. This includes the addition – elimination reaction of cyanide anion with perfluoroallyl fluorosulfate CF2[dbnd]CF
