3,4-Dichloropyridine (55934-00-4) is called for 5-Ethyl-2-(trifluoromethyl)benzimidazole ; CID55934 ; LS-32977 ; Benzimidazole, 5-ethyl-2-(trifluoromethyl)- ,and so on. 3,4-Dichloropyridine (55934-00-4) is white to light yellow solid.

IUPAC Name: 6-Ethyl-2-(trifluoromethyl)-1H-benzimidazole
CAS: 55934-00-4
Molecular Formula: C₅H₃Cl₂N
Molecular Weight: 147.99
Molecular structure:
Melting point:  22-23 °C
ACD/LogD (pH 5.5): 1.89 
ACD/LogD (pH 7.4): 1.89 
ACD/BCF (pH 5.5): 16.1 
ACD/BCF (pH 7.4): 16.1 
ACD/KOC (pH 5.5): 254.37 
ACD/KOC (pH 7.4): 254.39 
H bond acceptors: 1 
H bond donors: 0 
Freely Rotating Bonds: 0 
Index of Refraction: 1.553 
Molar Refractivity: 34.13 cm³ 
Molar Volume: 106.5 cm³ 
Polarizability: 13.53 10^-24cm³ 
Surface Tension: 43.1 dyne/cm 
Density: 1.388 g/cm³ 
Flash Point: 78.2 °C 
Enthalpy of Vaporization: 39.93 kJ/mol 
Boiling Point: 180.1 °C at 760 mmHg 
Vapour Pressure: 1.24 mmHg at 25°C 

 3,4-Dichloropyridine (55934-00-4) is commonly used as pharmaceutical intermediate.

Hazard Codes:  Xi
Safety Statements:  26-36 (26:  In case of contact with eyes, rinse immediately with plenty of water and seek medical advice 36:  Wear suitable protective clothing)
Hazard Note:  Irritant

Removal in wastewater treatment of 3,4-Dichloropyridine (55934-00-4) can be stated as follows:
Total removal:2.58  percent
Total biodegradation:0.10  percent
Total sludge adsorption:2.24  percent
Total to Air:0.24  percent
(using 10000 hr Bio P,A,S)