4,4'-Dichlorobiphenyl

IUPAC Name: 1-Chloro-4-(4-chlorophenyl)benzene
Synonyms of  4,4'-Dichlorobiphenyl (CAS NO. 2050-68-2): 1,1'-Biphenyl, 4,4'-dichloro- ; 4,4'-dichlorobiphenyl ; 4, 4'-Dichloro-1,1'-biphenyl ; 4,4'-Dichlorobiphenyl-UL-14C ; 4,4'-Dichloro-1,1'-biphenyl  ; 4,4'-PCB ; 4-DCB cpd ; Biphenyl, 4,4'-dichloro-
CAS NO: 2050-68-2
Molecular Formula: C₁₂H₈Cl₂
Molecular Weight: 223.1
Molecular Structure:
EINECS: 218-095-4
Mol File: 2050-68-2.mol 
H bond acceptors: 0
H bond donors: 0
Freely Rotating Bonds: 1
Polar Surface Area: 0 Å²
Index of Refraction: 1.594
Molar Refractivity: 60.63 cm³
Molar Volume: 178.6 cm³
Surface Tension: 41.1 dyne/cm
Density: 1.249 g/cm³
Flash Point: 145.2 °C
Enthalpy of Vaporization: 53.71 kJ/mol
Boiling Point: 318 °C at 760 mmHg
Vapour Pressure: 0.000694 mmHg at 25°C 
SMILES: Clc2ccc(c1ccc(Cl)cc1)cc2
InChI: InChI=1/C12H8Cl2/c13-11-5-1-9(2-6-11)10-3-7-12(14)8-4-10/h1-8H
InChIKey: YTBRNEUEFCNVHC-UHFFFAOYAH
Std. InChI: InChI=1S/C12H8Cl2/c13-11-5-1-9(2-6-11)10-3-7-12(14)8-4-10/h1-8H
Std. InChIKey: YTBRNEUEFCNVHC-UHFFFAOYSA-N
Product Categories of 4,4'-Dichlorobiphenyl (CAS NO. 2050-68-2): Method 508Environmental Standards;500 Series Drinking Water Methods;Aroclors, PCBs, and Dioxins;EPA;PCBs

Safety information of 4,4'-Dichlorobiphenyl (CAS NO.2050-68-2):
Hazard Codes: F,Xi,Xn
Risk Statements: 11-36/37/38-22
R11: Highly flammable.
R36/37/38: Irritating to eyes, respiratory system and skin.
R22: Harmful if swallowed.    
Safety Statements: 16-26-33-36
S16: Keep away from sources of ignition.
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S33: Take precautionary measures against static discharges.
S36: Wear suitable protective clothing.
RIDADR: 2315
RTECS: DV3912500
HazardClass: 9
PackingGroup: II 
Mutation data reported. When heated to decomposition it emits toxic vapors of Cl−.