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Pyrosulfuryl chloride

HCID 24649
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Basic information

CAS
7791-27-7
Standard SMILES
O=S(=O)(Cl)OS(=O)(=O)Cl
InChIKey
NNTJKSMVNWGFTB-UHFFFAOYSA-N
Molecular formula
Cl2O5S2
Average molar mass
215 g/mol
Monoisotopic mass
213.8564208

Overview

Pyrosulfuryl chloride appears as a colorless fuming liquid with a pungent odor. Irritates the eyes and mucous membranes. Corrosive to metals and tissue.

Names & identifiers

Preferred name
Pyrosulfuryl chloride
IUPAC
Disulfuryl dichloride
English name
PYROSULFURYL CHLORIDE
Molecular formula
Cl2O5S2
Molecular weight
215.03

Names & synonyms

PYROSULFURYL CHLORIDEDisulfuryl chlorideChlorosulfonic anhydride7791-27-7UNII-DKB8YHP7JAHSDB 1203UN1817PYROSULFURYL CHLORIDE [MI]CHLOROSULFONIC ANHYDRIDE [HSDB]RefChem:177878Sulfur pentoxydichlorideDisulfur pentoxydichloride
Show more names
disulfuryldisulphuryldichloridesulfurpentoxydichloridechlorosulfonicanhydridedisulfurpentoxydichlorideSulfur(VI) pentoxydichlorideBis(chloridosulfuric)anhydride
DKB8YHP7JADisulfuryl dichloridePyrosulfurylchloridpyrosulfuryl dichlorideSCHEMBL354729DTXSID90999111NNTJKSMVNWGFTB-UHFFFAOYSA-NPYROSULFURYL CHLORIDE (S2O5CL2)

Database identifiers

CAS
7791-27-7
PubChem CID
24649
DTXSID
DTXSID90999111
UNII
DKB8YHP7JA
Nikkaji
J95.297D

Properties

Computed structural properties

XLogP
0.8
Topological polar surface area
94.3 Ų
Hydrogen bond donors
0
Hydrogen bond acceptors
5
Rotatable bonds
2
Heavy atoms
9
Formal charge
0
Complexity
227

Experimental & physicochemical properties

Chemical Classes · 2 items

Toxic Gases & Vapors -> Other Toxic Gases & Vapors

Corrosives

SpringerMaterials PropertiesBoiling point
Density1.837
Color/FormCOLORLESS, MOBILE LIQ
Boiling Point151 °C
DecompositionVIOLENTLY DECOMP BY WATER INTO SULFURIC ACID & HYDROCHLORIC ACID
Melting Point-37 °C
Refractive IndexINDEX OF REFRACTION: 1.937 @ 20 °C
Physical Description · 2 items

Pyrosulfuryl chloride appears as a colorless fuming liquid with a pungent odor. Irritates the eyes and mucous membranes. Corrosive to metals and tissue.

Colorless fuming liquid; Very refractive; [Hawley]

Stability/Shelf Life

Safety & regulation

Safety information is for reference only and does not replace the supplier’s Safety Data Sheet (SDS), applicable regulations, or professional assessment.

Hazard information

Regulatory InformationThe New Jersey Worker and Community Right to Know Act requires public and private employers to provide information about hazardous substances at their workplaces. (N.J.S.A. 34:5A-1 et. seq.)
DOT LabelCorrosive
Fire Hazards · 2 items

Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:

· EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may burn, but none ignite readily.

Health Hazards · 2 items

Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:

· CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death.

Hazards Summary · 1 item

Violently decomposed by water forming sulfuric acid and hydrochloric acid; Corrosive to tissue; [Hawley] Reacts violently with moisture producing sulfuric acid and hydrochloric acid; An eye and mucous membrane irritant; Corrosive to tissue; [CAMEO]

DOT ID and Guide1817 137
Reactive GroupAnhydrides
Reactivity AlertsWater-Reactive
Reactivity Profile · 1 item

PYROSULFURYL CHLORIDE is strongly acidic. Incompatible with strong oxidizing agents, alcohols, amines and other bases. May react vigorously or explosively if mixed with diisopropyl ether or other ethers in the presence of trace amounts of metal salts [J. Haz. Mat., 1981, 4, 291]. Red and white forms of phosphorus react vigorously with the chloride.

Chemistry & industry

Uses & manufacturing

Uses · 3 items

Used for organic synthesis; [Hawley]

Toxic Gas from Spilling Chemical in Water [Category: Other]

ORG SYNTHESIS

Applications

UsesOrganic synthesis.

General DescriptionA colorless fuming liquid with a pungent odor. Irritates the eyes and mucous membranes. Corrosive to metals and tissue.

Related reactions

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Compound notes

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FUMING LIQ
Other Experimental Properties1.818 at 11 °C/4 °C; (gas) 9.6 g/L; decomp in acid

Physicochemical properties

Melting point
-37 ° · -37°
Boiling point
151 ° · bp 151°
Density
1.837 · 1.837
refractive index
1.937 · 1.937
solubility
2 O · reacts with H2O
color
colorless fuming liquid
FDA UNII
8 YHP7JA · DKB8YHP7JA
EPA Substance Registry System
Disulfuryl chloride (7791-27-7)
RIDADR
1817 · UN 1817
HazardClass
8 · 8
PackingGroup
II
Hazardous Substances Data
7791 · 7791-27-7(Hazardous Substances Data)
DOT Emergency Guidelines · 5 items

/GUIDE 137: SUBSTANCES - WATER-REACTIVE - CORROSIVE/ Fire or Explosion: EXCEPT FOR ACETIC ANHYDRIDE (UN1715), THAT IS FLAMMABLE, some of these materials may burn, but none ignite readily. May ignite combustibles (wood, paper, oil, clothing, etc.). Substance will react with water (some violently), releasing corrosive and/or toxic gases and runoff. Flammable/toxic gases may accumulate in confined areas (basement, tanks, hopper/tank cars, etc.). Contact with metals may evolve flammable hydrogen gas. Containers may explode when heated or if contaminated with water. Substance may be transported in a molten form.

/GUIDE 137: SUBSTANCES - WATER-REACTIVE - CORROSIVE/ Health: CORROSIVE and/or TOXIC; inhalation, ingestion or contact (skin, eyes) with vapors, dusts or substance may cause severe injury, burns or death. Fire will produce irritating, corrosive and/or toxic gases. Reaction with water may generate much heat that will increase the concentration of fumes in the air. Contact with molten substance may cause severe burns to skin and eyes. Runoff from fire control or dilution water may cause pollution.

/GUIDE 137: SUBSTANCES - WATER-REACTIVE - CORROSIVE/ Public Safety: CALL Emergency Response Telephone Number on Shipping Paper first. If Shipping Paper not available or no answer, refer to appropriate telephone number listed on the inside back cover. As an immediate precautionary measure, isolate spill or leak area in all directions for at least 50 meters (150 feet) for liquids and at least 25 meters (75 feet) for solids. Keep unauthorized personnel away. Stay upwind. Keep out of low areas. Ventilate enclosed areas.

/GUIDE 137: SUBSTANCES - WATER-REACTIVE - CORROSIVE/ Protective Clothing: Wear positive pressure self-contained breathing apparatus (SCBA). Wear chemical protective clothing that is specifically recommended by the manufacturer. It may provide little or no thermal protection. Structural firefighters' protective clothing provides limited protection in fire situations ONLY; it is not effective in spill situations where direct contact with the substance is possible.

For more DOT Emergency Guidelines (Complete) data for PYROSULFURYL CHLORIDE (8 total), please visit the HSDB record page.

DOT Hazard Classification · 4 items

Pyrosulfuryl chloride

UN1817

Class 8 Corrosive material (49 eCFR § 173.136)

PG II: the degree of danger presented by the material is medium

Air and Water ReactionsFumes in air. Decomposes violently and exothermically in water or moist air to form sulfuric acid and hydrochloric acid [Merck, 11th ed. 1989].

Safety & protection

Fire FightingExcerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:
Accidental Release Measures · 2 items

· CALL 911. Then call emergency response telephone number on shipping paper. If shipping paper not available or no answer, refer to appropriate telephone number listed on the inside back cover.

· Do not touch damaged containers or spilled material unless wearing appropriate protective clothing.

First Aid · 2 items

Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:

General First Aid:

Exposure Control and Personal Protection· Wear positive pressure self-contained breathing apparatus (SCBA).
Cleanup Methods · 2 items

Spills of hazardous chemicals (such as inorganic sulfur acids, oleums of strength 35 to 65%, liquid sulfur trioxide, or chlorosulfonic acid) can be treated with high molecular weight polyacrylamide, polymethyl methacrylate or a blend of polyacrylamides. Each forms a polymer skin over the liquid surface, suppressing the fume & allowing access to the spill so that cleanup can be done in a controlled manner. Polyacrylamide variant DP 1916 is best treatment for chlorosulfonic acid & oleum 20. Polycarbonate granules used in a layer approx 80 mm thick topped off with Sorboil (an absorbent clay) is best treatment for diked spills of oleums of all strengths & liq sulfur trioxide. The acid beneath the skin is best recovered by pumping. Unconfined spills of sulfur trioxide & oleums of all strengths can be treated with excess anhydrous sodium sulfate which forms a concrete-like residue that can be sprayed with water within 1 hour, dissolving it slowly. Expanded perlite, if contained in degradable bags, will effectively absorb & contain sulfur acids. Fumes of oleum 65% arising from spillage of 80 to 750 kg can be killed within 4 to 13 min. Asphalt or concrete is slightly affected.

TWO STAGE PURIFICATION TO REMOVE PYROSULFURYL CHLORIDE FROM WASTE GASES, 1ST STAGE GASES TREATED WITH HCL & H2SO4, CONCN OF 24-28%, 2ND STAGE GASES TREATED WITH SAME ACIDS, CONCN OF 6-10%, SUBSEQUENT MIXT TREATMENT WITH 92.5-98% H2SO4 @ 60-100 DEG.

Nonfire Spill ResponseExcerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:
Isolation and Evacuation · 2 items

Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:

Immediate precautionary measure

Personal Protective Equipment (PPE)Excerpt from ERG Guide 137 [Substances - Water-Reactive - Corrosive]:
Emergency Response Planning Guidelines· When material is not involved in fire, do not use water on material itself.

Toxicology

Adverse EffectsDermatotoxin - Skin burns.
Human Toxicity Excerpts · 3 items

SYMPTOMATOLOGY (...INGESTION OR SKIN CONTACT): 1. CORROSION OF MUCOUS MEMBRANES OF MOUTH, THROAT AND ESOPHAGUS, WITH IMMEDIATE PAIN AND DYSPHAGIA. NECROTIC AREAS...GRAYISH WHITE BUT SOON ACQUIRE A BLACKISH DISCOLORATION (YELLOW IN CASE OF NITRIC ACID) & SOMETIMES SHRUNKEN OR WRINKLED TEXTURE... 2. EPIGASTRIC PAIN...MAY BE ASSOC WITH NAUSEA & VOMITING... AT TIMES, GASTRIC HEMORRHAGE MAY BE INTENSE, AND VOMITUS THEN CONTAINS FRESH BLOOD. PROFOUND THIRST. 3. ULCERATION OF ALL MEMBRANES AND TISSUES WITH WHICH THE ACID COMES IN CONTACT. AFTER THE INGESTION OF CONCN MINERAL ACID, THIS CORROSION MAY LEAD WITHIN A FEW HR OR A FEW DAYS TO GASTRIC PERFORATION AND PERITONITIS. 4. CIRCULATORY COLLAPSE WITH CLAMMY SKIN, WEAK & RAPID PULSE, SHALLOW RESP, AND SCANTY URINE. CIRCULATORY SHOCK IS OFTEN IMMEDIATE CAUSE OF DEATH. /ACIDS/

SYMPTOMATOLOGY.../INGESTION/: 6. LATE ESOPHAGEAL, GASTRIC & PYLORIC STRICTURES & STENOSES, WHICH MAY REQUIRE MAJOR SURGICAL REPAIR, SHOULD BE ANTICIPATED. SIGNS OF OBSTRUCTION COMMONLY APPEAR WITHIN A FEW WK BUT MAY BE DELAYED FOR MONTHS AND EVEN YEARS. PERMANENT SCARS MAY ALSO APPEAR IN THE CORNEA, SKIN AND OROPHARYNX. 7. UNCORRECTED CIRCULATORY COLLAPSE OF SEVERAL HR...MAY LEAD TO RENAL FAILURE & ISCHEMIC LESIONS IN LIVER & HEART. /ACIDS/

Toxic & corrosive to tissue.

Safety data

ridadr
UN 1817
hazard_class
8
packing_group
II
Hazardous Substances Data
7791-27-7(Hazardous Substances Data)