Thiobenzoic acid

Thiobenzoic acid

Names
IUPAC name benzenecarbothioic S-acid
Other names Benzoyl thiol Monothiobenzoic acid
Identifiers
CAS Number	98-91-9
3D model (JSmol)	Interactive image
ChemSpider	7136
EC Number	202-712-9202-712-9
Gmelin Reference	1071790
PubChem CID	7414
RTECS number	DH6839000
InChI InChI=1S/C7H6OS/c8-7(9)6-4-2-1-3-5-6/h1-5H,(H,8,9)
SMILES C1=CC=C(C=C1)C(=O)S
Properties
Chemical formula	C7H6OS
Molar mass	138.18 g·mol−1
Appearance	Clear yellow liquid
Density	1.1775 g/cm3
Melting point	24 °C (75 °F; 297 K)
Boiling point	222 °C (432 °F; 495 K)
Solubility in water	Very soluble
Vapor pressure	0.1
Acidity (pKa)	3.61
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Thiobenzoic acid is an organosulfur compound with molecular formula C
7H
6OS. It is the parent of aryl thiocarboxylic acids. With a pK_a near 2.5, this acid is almost 100x more acidic than benzoic acid. The conjugate base is thiobenzoate, C₆H₅COS⁻.