Perfluorobutanoic acid

HFBA can also refer to Hebrew Free Burial Association

Perfluorobutanoic acid (PFBA) is a perfluoroalkyl carboxylic acid with the formula C₃F₇CO₂H. As the perfluorinated derivative of butyric acid, this colourless liquid is prepared by the sequential electrofluorination and hydrolysis of butyryl fluoride.^[3]

Perfluorobutanoic acid

Names
Preferred IUPAC name Heptafluorobutanoic acid
Other names Perfluorobutanoic acid Perfluorobutyric acid Heptafluorobutyric acid HFBA PFBA[1] C4 PFCA
Identifiers
CAS Number	375-22-4 Y
3D model (JSmol)	Interactive image
Abbreviations	HFBA
ChEBI	CHEBI:39426 N
ChemSpider	9394 N
ECHA InfoCard	100.006.170
PubChem CID	9777
UNII	12VHZ8L29I Y
CompTox Dashboard (EPA)	DTXSID4059916
InChI InChI=1S/C4HF7O2/c5-2(6,1(12)13)3(7,8)4(9,10)11/h(H,12,13) N Key: YPJUNDFVDDCYIH-UHFFFAOYSA-N N InChI=1/C4HF7O2/c5-2(6,1(12)13)3(7,8)4(9,10)11/h(H,12,13) Key: YPJUNDFVDDCYIH-UHFFFAOYAI
SMILES OC(C(F)(F)C(F)(F)C(F)(F)F)=O
Properties
Chemical formula	C4HF7O2
Molar mass	214.039 g·mol−1
Appearance	colourless liquid
Density	1.64 g/ml
Boiling point	120 °C (248 °F; 393 K)
Solubility in water	high
Hazards
Occupational safety and health (OHS/OSH):
Main hazards	strong acid
GHS labelling:[2]
Pictograms
Signal word	Danger
Hazard statements	H314
Precautionary statements	P260, P280, P303+P361+P353, P304+P340+P310, P305+P351+P338
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

Applications

PFBA has a variety of niche applications in analytical and synthetic chemistry. It is an ion pair reagent for reverse-phase high-performance liquid chromatography. It is used in the sequencing, synthesis, and solubilizing of proteins and peptides.

Esters derived from PFBA readily undergo condensation, owing to their electrophilicity. Specialized ligands for metal ions are generated capitalizing on this property, such as Eufod.

PFBA was formerly used for manufacturing photographic film. The 3M Company was a major manufacturer of PFBA and products containing PFBA but production was phased out in 1998.^[4]

Environmental impact and regulation

PFBA is a breakdown product of other PFAS that have been used in stain-resistant fabrics, paper food packaging, carpets, and consumer products.^[5] PFBA has been frequently found in U.S. rivers.^[4][6]

In laboratory animal studies, exposure to high levels of PFBA results in thyroid and liver effects, such as increased thyroid and liver weight, changes in thyroid hormones, decreased cholesterol, and cellular changes in both organs. Other effects of PFBA exposure included delayed development and decreased red blood cells and hemoglobin.^[4]

The Minnesota Department of Health (MDH) developed a guidance value of 7 ppb (μg/L) for PFBA in drinking water.^[4]