Product Name: 2,4-Dichlorobenzenesulfonyl chloride (CAS NO.16271-33-3)

Empirical Formula: C₆H₃Cl₃O₂S
Molecular Weight: 245.5108 
Index of Refraction: 1.581
Density: 1.636 g/cm³
Flash Point: 140.3 °C
Enthalpy of Vaporization: 52.72 kJ/mol
Boiling Point: 308.4 °C at 760 mmHg
Vapour Pressure: 0.00124 mmHg at 25 °C
Melting point: 55-58 °C(lit.)
Sensitive: Moisture Sensitive
Appearance: White to light beige crystalline powder
Surface Tension: 48.8 dyne/cm
Enthalpy of Vaporization: 52.72 kJ/mol
Index of Refraction: 1.581 
Molar Refractivity: 50.05 cm3 
Molar Volume: 149.9 cm3 
XLogP3-AA: 3
H-Bond Donor: 0
H-Bond Acceptor: 2
Structure Descriptors of 2,4-Dichlorobenzenesulfonyl chloride (CAS NO.16271-33-3):
  IUPAC Name: 2,4-dichlorobenzenesulfonyl chloride
  Canonical SMILES: C1=CC(=C(C=C1Cl)Cl)S(=O)(=O)Cl
  InChI: InChI=1S/C6H3Cl3O2S/c7-4-1-2-6(5(8)3-4)12(9,10)11/h1-3H 
  InChIKey: FDTPBIKNYWQLAE-UHFFFAOYSA-N
Product Categories: Benzenesulfonyl chloride; Organic Building Blocks; Sulfonyl Halides; Sulfur Compounds                  

Safety Information of 2,4-Dichlorobenzenesulfonyl chloride (CAS NO.16271-33-3):
Hazard Codes: C
Risk Statements: 34 
R34:Causes burns.
Safety Statements: 26-36/37/39-45 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
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.)
RIDADR: UN 3261 8/PG 2
WGK Germany: 3
RTECS: DB8927500
Hazard Note: Corrosive/Moisture Sensitive
HazardClass: 8
PackingGroup: II

 2,4-Dichlorobenzenesulfonyl chloride , its cas register number is 16271-33-3. It also can be called Benzenesulfonyl chloride, 2,4-dichloro- . It is hazardous,so the first aid measures and others should be known. Such as: When on the skin: first,should flush skin with plenty of water immediately for at least 15 minutes while removing contaminated clothing. Secondly,Get medical aid. Or in the eyes: Flush eyes with plenty of water for at least 15 minutes, occasionally lifting the upper and lower eyelids. Then get medical aid soon. While ,it's Inhaled: Remove from exposure and move to fresh air immediately.Give artificial respiration while not breathing. When breathing is difficult, give oxygen. And as soon as to get medical aid. Then you have the ingesting of the product : Do not induce vomiting.If victim is conscious and alert, give 2-4 cupfuls of milk or water.If conscious drink water, then induce vomiting, and get medical aid immediately.Notes to physician: Treat supportively and symptomatically.
In addition, 2,4-Dichlorobenzenesulfonyl chloride (CAS NO.16271-33-3) is moisture sensitive. It is not compatible with strong oxidizing agents, strong acids, strong bases, acid chlorides, amines, and you must not take it with incompatible materials, and not be exposured to moist air or water.And also prevent it to broken down into hazardous decomposition products: hydrogen chloride, carbon monoxide, oxides of sulfur, carbon dioxide.