Molecular Structure of 5-Chlorothiophene-2-sulfonyl chloride (CAS NO.2766-74-7):

IUPAC Name: 5-chlorothiophene-2-sulfonyl chloride 
Empirical Formula: C₄H₂Cl₂O₂S₂
Molecular Weight: 217.09348
Melting point: 25-28°C
Storage temp: Keep Cold
Sensitive: Moisture Sensitive
BRN: 130710
Boiling Point: 112-117 °C(lit.)
Density: 1.623 g/mL at 25 °C(lit.)
Refractive index: n20/D 1.586(lit.)
Flash Point: >230 °F
SMILES: c1cc(sc1S(=O)(=O)=Cl)Cl
InChI: InChI=1/C4H2Cl2O2S2/c5-3-1-2-4(9-3)10(6,7)8/h1-2H
Handling: Do not breathe dust, vapor, mist, or gas. Do not get in eyes, on skin, or on clothing. Use only in a chemical fume hood.
Storage: Store in a cool, dry place. Store in a tightly closed container. Corrosives area. Store protected from light. Store under an inert atmosphere
Product Categories: Heterocycles; Thiophene&Benzothiophene; Thiophene intermediates; Halogenated Heterocycles; Heterocyclic Building Blocks; Thiophenes; ThiophenesBuilding Blocks

Hazard Codes: C
Risk Statements: 34-29-14
R34:Causes burns. 
R29:Contact with water liberates toxic gas. 
R14 :Reacts violently with water.
Safety Statements: 26-27-36/37/39-45-28A-25
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S27:Take off immediately all contaminated clothing. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S28:After contact with skin, wash immediately with plenty of soap-suds. 
S25:Avoid contact with eyes.
RIDADR: UN 3265 8/PG 2
WGK Germany: 3
Hazard Note: Corrosive
HazardClass: 8
PackingGroup: II

  5-Chlorothiophene-2-sulfonyl chloride , with CAS number of 2766-74-7, can be called 2-Chloro-5-chlorosulfonylthiophene ; 2-Chlorothiophene-5-sulfonyl chloride ; 5-Chloro-2-thienylsulfonyl chloride ; 5-Chloro-2-thiophenesulfonyl chloride . It is a white to yellow crystalline low melting solid.