2-Acetyl-6-bromopyridine Chemical Properties

Melting point:

51-55 °C (lit.)

Boiling point:

271.2±25.0 °C(Predicted)

Density 

1.534±0.06 g/cm3(Predicted)

storage temp. 

Keep in dark place,Sealed in dry,Room Temperature

solubility 

Soluble in methanol.

form 

Solid

pka

0.28±0.10(Predicted)

color 

Off-White to Pale Beige

InChI

InChI=1S/C7H6BrNO/c1-5(10)6-3-2-4-7(8)9-6/h2-4H,1H3

InChIKey

RUJTWTUYVOEEFW-UHFFFAOYSA-N

SMILES

C(=O)(C1=NC(Br)=CC=C1)C

CAS DataBase Reference

49669-13-8(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

WGK Germany 

3

HazardClass 

IRRITANT

HS Code 

29333990

2-Acetyl-6-bromopyridine Usage And Synthesis

Chemical Properties

Solid

Uses

2-Acetyl-6-bromopyridine, is used as an important raw material and intermediate used in organic Synthesis, pharmaceuticals, agrochemicals and dyestuff. It is also used as OLED intermediate.

Synthesis

General procedure for the synthesis of 2-acetyl-6-bromopyridine from 2,6-dibromopyridine and N,N-dimethylacetamide: 2,6-dibromopyridine (10.0 g, 42.2 mmol) was placed in a dry reaction flask. To ensure an inert atmosphere, the reaction flask was evacuated and replaced with nitrogen and repeated three times. 150 mL of anhydrous diethyl ether was added to the reaction flask and after cooling to -78 °C, n-butyllithium solution (17.7 mL, 44.3 mmol, 2.5 M in n-hexane) was slowly added dropwise and the color of the mixture was observed to change from clear to yellowish brown. Maintained at -78 °C and stirred continuously for 30 min. Subsequently, N,N-dimethylacetamide (4.7 mL, 50.7 mmol) was added slowly and the reaction was maintained at -78 °C for 3 hours. Upon completion of the reaction, the temperature was slowly increased to 20 °C, at which point the color of the mixture changed to a turbid gray. The reaction was quenched by the slow addition of deionized water. The solvent was removed by rotary evaporation and the residue was washed several times with ethyl acetate and saturated sodium chloride solution, the organic layers were combined and dried over anhydrous sodium sulfate. The crude product was purified by silica gel column chromatography (eluent: ethyl acetate/hexane=1:20) and then recrystallized in a mixture of dichloromethane and n-hexane solvent (dichloromethane/hexane=1:20) to give a white crystalline product (6.80 g, 81% yield). The product was characterized by 1H NMR (400 MHz, CDCl3): δ 7.97 (dd, J=7.0,1.6Hz, 1H), 7.68 (t, J=7.8Hz, 1H), 7.64 (dd, J=8.0,1.2Hz, 1H), 2.69 (s, 3H), and was confirmed as the target compound 2-acetyl-6-bromopyridine.

References

[1] Organometallics, 2016, vol. 35, # 2, p. 198 - 206
[2] Journal of Heterocyclic Chemistry, 2009, vol. 46, # 1, p. 116 - 118
[3] Patent: US9219237, 2015, B1. Location in patent: Page/Page column 7
[4] Journal of Organic Chemistry, 2006, vol. 71, # 1, p. 167 - 175
[5] Bioorganic and Medicinal Chemistry, 2005, vol. 13, # 24, p. 6763 - 6770

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