CAS 512-35-6 corresponds to benzenesulfonic anhydride (commonly known), with a chemical formula of C ₁₂ H ₁₀ O ₅ S ₂ and a molecular weight of 298.33. It is an anhydride formed by dehydration of two molecules of benzenesulfonic acid and is a corrosive solid. It is mainly used for sulfonation or construction of sulfone structures in organic synthesis.

Basic Information
-Chinese name: benzenesulfonic anhydride (alias: benzenesulfonic acid sulfide, note: this alias is misleading and not a standard name)
-English name: Benesulfonic Anhydride
-Molecular formula: C ₁₂ H ₁₀ O ₅ S ₂
-Molecular weight: 298.33
-Structural features: Two benzenesulfonyl groups are connected by an oxygen bridge (Ph-SO ₂ – O-SO ₂ – Ph)
-Appearance: White to pale yellow/orange powder or crystal
-Melting point: 60-85 ℃ (softening starts at around 55 ℃), some data report 88-91 ℃
-Boiling point: approximately 463.7 ℃ (760 mmHg, predicted value)
-Density: 1.439 g/cm ³
-Flash point: 234.3 ℃
-Refractive index: 1.599

Safety and Storage
-Hazard category: Class 8 corrosive substances (UN 3261)
-Main hazards: H314 (causing severe skin burns and eye damage), H290 (may corrode metals)
-Storage conditions: Sealed, stored in a cool and dry place (recommended 2-8 ℃), moisture-proof, away from acids and fire sources
-Protection requirements: Wear protective gloves, goggles, and protective clothing to avoid inhaling dust or coming into contact with skin/eyes

main purpose
-As a sulfonation reagent in organic synthesis or for constructing sulfone bonds in Friedel Crafts type reactions
-Pharmaceutical intermediates and synthetic raw materials for fine chemicals
-Laboratory research reagents (purity usually ≥ 96%)

Note: “Benzenesulfonic Acid Sulfide” is a misused alias in some commercial databases, and its structure is actually sulfonic anhydride rather than a derivative or sulfide of sulfonic acid. Please refer to “Benzenesulfonic Acid Anhydride” for retrieval and operation.

Products :

CAS 512-35-6, Benzenesulfonicanhydride, C12H10O5S2
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