Molecular Structure of 2-Chloro-5-chloromethylthiophene (CAS NO.23784-96-5):

IUPAC Name: 2-Chloro-5-(chloromethyl)thiophene 
Molecular Formula: C₅H₄Cl₂S
Molecular Weight: 167.05626 g/mol
XLogP3-AA: 3
H-Bond Donor: 0
H-Bond Acceptor: 0
Canonical SMILES: C1=C(SC(=C1)Cl)CCl
InChI: InChI=1S/C5H4Cl2S/c6-3-4-1-2-5(7)8-4/h1-2H,3H2
InChIKey: MQTKXCOGYOYAMW-UHFFFAOYSA-N
Index of Refraction: 1.577
Molar Refractivity: 39.29 cm³
Molar Volume: 118.5 cm³
Surface Tension: 41.8 dyne/cm
Density: 1.409 g/cm³
Flash Point: 100.6 °C
Enthalpy of Vaporization: 43.38 kJ/mol
Boiling Point: 215.9 °C at 760 mmHg
Vapour Pressure: 0.211 mmHg at 25 °C
Water Solubility: 104.6 mg/L at 25 °C
Refractive Index: n20/D 1.575(lit.)

Safety Information of 2-Chloro-5-chloromethylthiophene (CAS NO.23784-96-5):
Hazard Codes: Xi 
Risk Statements: 36/37/38
R36/37/38:Irritating to eyes, respiratory system and skin
Safety Statements: 26-37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice
S37/39:Wear suitable gloves and eye/face protection
WGK Germany: 3
A storage hazard, it may decompose explosively at room temperature. When heated to decomposition it emits toxic fumes of Cl⁻ and SO_x.

  2-Chloro-5-chloromethylthiophene with CAS registry number of 23784-96-5 is a kind of sulphur derivatives, also known as 2-Chloro-5-chloromethylthiophene 98+% ; 5-Chloro-2-thenyl chloride ; 2-Chloro-5-(chloromethyl)thiophene , 97% ; TL8001963 . It is clear colorless to yellow liquid.