2-sulfobenzoic anhydride

Structural formula
General
Surname	2-sulfobenzoic anhydride
other names	2,1-benzoxathiol-3-one-1,1-dioxide o -sulfobenzoic anhydride
Molecular formula	C 7 H 4 O 4 S
External identifiers / databases
CAS number 81-08-3 EC number 201-322-6 ECHA InfoCard 100.001.203 PubChem 65729 ChemSpider 59152 Wikidata Q27037740
properties
Molar mass	184.17 g mol −1
Physical state	firmly
Melting point	116-122 ° C
safety instructions
GHS labeling of hazardous substances Caution H and P phrases H: 315-319 P: 302 + 352-305 + 351 + 338
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

2-sulfobenzoic anhydride is the internal anhydride of 2-sulfobenzoic acid . It is used for the synthesis of sulfonphthaleins .

The hydroxyl group content of a sample can be determined analytically by esterification with sulfobenzoic anhydride . Analogously, the content of primary and secondary amino groups of a substance to be examined can be determined analytically by amide formation with sulfobenzoic anhydride .

Individual evidence

1. ↑ ^{a b c} Data sheet 2-sulfobenzoic anhydride (PDF) from Merck , accessed on September 25, 2016.
2. ^ ^{A b} V. Iyer, NK Mathur: Determination of purity of o-sulphobenzoic anhydride . In: Talanta . tape 13 , no. 11 , 1966, pp. 1592-1595 , doi : 10.1016 / 0039-9140 (66) 80108-X .
3. ↑ Esterification of Hydroxylated Polymers with 2-Sulfobenzoic Acid Cyclic Anhydride , 2005.