The 2-Chloropyridine-5-boronic acid pinacol ester ,its cas register number is 444120-94-9.It also can be called as 2-Chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine and the IUPAC name about this chemicals is 2-Chloro-5-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine .

Following are the chemical properties about 2-Chloropyridine-5-boronic acid pinacol ester :(1)#H bond acceptors: 3 ; (2)#H bond donors: 0 ; (3)#Freely Rotating Bonds: 1 ; (4)Polar Surface Area: 31.35Ų ; (5)Index of Refraction: 1.505 ; (6)Molar Refractivity: 62.08 cm³ ; (7)Molar Volume: 209.2 cm³ ; (8)Polarizability: 24.61x10^-24cm³ ; (9)Surface Tension: 36.5 dyne/cm; (10)Enthalpy of Vaporization: 54.81 kJ/mol ; (11)Vapour Pressure: 0.000364 mmHg at 25°C

The 2-Chloropyridine-5-boronic acid pinacol ester is a white to light yellow crystal powder and it is a dangerous chemical, because it is harmful by inhalation, in contact with skin and if swallowed, also it irritating to eyes. In additon, in case of contact with eyes, rinse immediately with plenty of water and seek medical advice. Except these safety informations, there are also exist other data like WGK Germany is 3 and HazardClass about this chemical is Irritant.

There are some first aid measures: After inhalation, please supply fresh air. If required, provide artificial respiration, and keep patient warm, also consult doctor if symptoms persist; After skincontact, please seek immediate medical advice, then instantly wash with water and soap and rinse thoroughly; After eye contact, please seek immediate medical advice, and rinse opened eye for several minutes under running water. Then consult doctor; After swallowing, please seek immediate medical advice.

This chemicals can be described computed from structure:
(1)Canonical SMILES: B1(OC(C(O1)(C)C)(C)C)C2=CN=C(C=C2)Cl
(2)InChI: InChI=1S/C11H15BClNO2/c1-10(2)11(3,4)16-12(15-10)8-5-6-9(13)14-7-8/h5-7H,1-4H3 
(3)InChIKey: IEFBTHROULVUAH-UHFFFAOYSA-N