Sulfobenzoic acids
Sulfobenzoic acids | ||||||
Surname | 2-sulfobenzoic acid | 3-sulfobenzoic acid | 4-sulfobenzoic acid | |||
other names |
o -sulfobenzoic acid, 2-sulfobenzoate, orthosulfobenzoic acid |
m -sulfobenzoic acid, 3-sulfobenzoate |
p -sulfobenzoic acid, 4-sulfobenzoate, parasulfobenzoic acid |
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Structural formula | ||||||
CAS number | 632-25-7 | 121-53-9 | 636-78-2 | |||
PubChem | 12438 | 8477 | 69469 | |||
Molecular formula | C 7 H 6 O 5 S | |||||
Molar mass | 202.185 g mol −1 | |||||
Physical state | firmly | |||||
Brief description | colorless powder | |||||
Melting point | 134 ° C | 141 ° C | 259-260 ° C | |||
solubility | soluble in water | |||||
GHS labeling |
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H and P phrases | see above | see above | see above | |||
see above | see above | see above | ||||
see above | see above | see above |
The sulfobenzoic acids (or sulphobenzoates) constitute a group of substances, which, both from the in chemistry benzoic acid as well as the benzenesulfonic acid is derived. The structure consists of a benzene ring with attached carboxy (–COOH) and sulfonic acid groups (–SO 3 H) as substituents . Their different arrangements ( ortho , meta or para ) result in three constitutional isomers with the empirical formula C 7 H 6 O 5 S.
properties
Due to the spatial arrangement of 2-sulfobenzoic acid, ring closure can occur between the two functional groups. The resulting compound (it lacks one H 2 O) is known as 2-sulfobenzoic anhydride with the empirical formula C 7 H 4 O 4 S.
Derivatives
Sulfobenzoic acids form the starting point for various salts , esters , amides , various chlorinated and other derivatives derived therefrom .
This also includes the saccharin C 7 H 5 NO 3 S, which can be regarded as a 2-sulfobenzoic acid imide, and its derivatives. Another derivative is e.g. B. 5-sulfosalicylic acid (2-hydroxy-5-sulfobenzoic acid) C 7 H 6 O 6 S
Further derivatives are:
- 2-sulfobenzoic acid dichloride C 7 H 4 Cl 2 O 3 S, CAS number: 34684-21-4
- 3-sulfobenzoic acid dichloride C 7 H 4 Cl 2 O 3 S, CAS number: 4052-92-0
- 4-sulfobenzoic acid dichloride C 7 H 4 Cl 2 O 3 S, CAS number: 7516-60-1