The Pentachloropyridine is an organic compound with the formula C₅Cl₅N. The IUPAC name of this chemical is 2,3,4,5,6-pentachloropyridine. With the CAS registry number 2176-62-7, it is also named as pyridine, 2,3,4,5,6-pentachloro-. The product's categories are Chloropyridines; Halopyridines; C5Heterocyclic Building Blocks; Halogenated Heterocycles; Heterocyclic Building Blocks; Pyridines. Besides, it is white to off-white flake, which should be stored in a closed cool and dry place. It is used as a pesticide and pharmaceutical intermediates, which can be used for production pesticides of chlorpyrifos and dichloro-pyridine acid.

Physical properties about Pentachloropyridine are: (1)ACD/LogP: 3.61; (2)ACD/LogD (pH 5.5): 3.61; (3)ACD/LogD (pH 7.4): 3.61; (4)ACD/BCF (pH 5.5): 323.72; (5)ACD/BCF (pH 7.4): 323.72; (6)ACD/KOC (pH 5.5): 2179.63; (7)ACD/KOC (pH 7.4): 2179.63; (8)#H bond acceptors: 1; (9)Polar Surface Area: 12.89 Å²; (10)Index of Refraction: 1.601; (11)Molar Refractivity: 48.81 cm³; (12)Molar Volume: 142.4 cm³; (13)Polarizability: 19.35×10^-24cm³; (14)Surface Tension: 51.1 dyne/cm; (15)Density: 1.764 g/cm³; (16)Flash Point: 151.5 °C; (17)Enthalpy of Vaporization: 50.02 kJ/mol; (18)Boiling Point: 282.3 °C at 760 mmHg; (19)Vapour Pressure: 0.00579 mmHg at 25°C.

Preparation: this chemical can be prepared by octachloro-4,4'-sulfanediyl-bis-pyridine. This reaction will need reagent CCl₄. The reaction time is 22 hours. The yield is about 44%.

Uses of Pentachloropyridine: it can be used to produce 3,5-dichloro-2,4,6-trifluoro-pyridine at temperature of 190 °C. It will need reagent KF and solvent tetrahydrothiophene 1,1-dioxide with reaction time of 3 days. The yield is about 93%.

When you are using this chemical, please be cautious about it as the following:
It is harmful if swallowed and may cause sensitisation by inhalation and skin contact. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Besides, this chemical is irritating to eyes, respiratory system and skin. When you are using it, wear suitable protective clothing, do not breathe dust and avoid contact with skin and eyes.

You can still convert the following datas into molecular structure:
(1)SMILES: Clc1c(Cl)c(Cl)nc(Cl)c1Cl
(2)InChI: InChI=1/C5Cl5N/c6-1-2(7)4(9)11-5(10)3(1)8
(3)InChIKey: DNDPLEAVNVOOQZ-UHFFFAOYAW
(4)Std. InChI: InChI=1S/C5Cl5N/c6-1-2(7)4(9)11-5(10)3(1)8
(5)Std. InChIKey: DNDPLEAVNVOOQZ-UHFFFAOYSA-N

The toxicity data is as follows: