Tetrafluoroboric acid

• Catalog No.: L14037
• CAS Number: 16872-11-0
• M. F.: BF4-
• M. W.: 86.8046128
• Purity: ca 50% w/w aq. soln.

SYNONYMS

• Title: 四氟硼酸
• IUPAC name: hydrogen tetrafluoroboranuide
• IUPAC Traditional name: hydrogen tetrafluoroborate
• Synonyms: Fluoboric acid; Tetrafluoroboric acid

DATABASE IDS

• MDL Number: MFCD00011345
• Merck Index: 144149
• EC Number: 240-898-3
• CAS Number: 16872-11-0

PROPERTIES

• Purity: ca 50% w/w aq. soln.
• Boiling Point: 130°C dec.
• Density: 1.410
• GHS Hazard statements: H314-H227
• European Hazard Symbols: Corrosive (C)
• GHS Precautionary statements: P210-P260-P303+P361+P353-P305+P351+P338-P405-P501A
• Risk Statements: 34
• RTECS: ED2685000
• Safety Statements: 26-27-45
• TSCA Listed: 是
• Hazard Class: 8
• UN Number: UN1775
• Packing Group: II

REFERENCES

• Precursor of tetrafluoroborate salts of various stabilized cations. See, e.g.: Org. Synth. Coll., 5, 1135 (pyrylium), 1138 (tropylium); 6, 364 (sulfonium), 991 (cyclopropenium).
• Addition to aqueous solutions of aryldiazonium salts usually results in precipitation of the diazonium tetrafluoroborates, which are often stable enough to be isolated, and can undergo various reactions in non-aqueous solvents. For hydrodediazoniation in the presence of formamide, see: J. Chem. Soc., Perkin 1, 873 (1986). Probably their most important use is the Schiemann (or Balz-Schiemann) synthesis of aryl fluorides in which the tetrafluoroborate salt is heated neat or in an inert solvent. For examples, see: Org. Synth. Coll., 2, 188, 295, 299 (1943). Reviews: Org. React., 5, 193 (1949); Adv. Fluorine. Chem., 4, 1 (1965). See also Hexafluorophosphoric acid, L15728.