7-bromo-4H-chromen-4-one Chemical Properties

Melting point:

154-159°C

Boiling point:

306.0±42.0 °C(Predicted)

Density 

1.688±0.06 g/cm3(Predicted)

storage temp. 

Keep in dark place,Inert atmosphere,Room temperature

form 

solid

Appearance

White to off-white Solid

Safety Information

Hazard Codes 

Xn

Risk Statements 

22-36

Safety Statements 

26

WGK Germany 

3

7-bromo-4H-chromen-4-one Usage And Synthesis

Synthesis

General procedure for the synthesis of 7-bromo-4H-chromen-4-one from (E)-1-(4-bromo-2-hydroxyphenyl)-3-(dimethylamino)prop-2-en-1-one: Concentrated hydrochloric acid (30 mL) was slowly added to a (E)-1-(4-bromo-2-hydroxyphenyl)-3-(dimethylamino)prop-2-en-1-one (10.4 g, 38.5 mmol) in a solution of dichloromethane (250 mL). The reaction mixture was heated to reflux for 30 minutes and then cooled to room temperature. The aqueous phase was extracted with dichloromethane (20 mL). The organic phases were combined, washed with saturated sodium bicarbonate solution (50 mL), dried over anhydrous sodium sulfate, and filtered. The solvent was removed by concentration under reduced pressure to give 7-bromo-4H-chromen-4-one (8.7 g, 38.5 mmol, 100% yield).

References

[1] Patent: WO2012/68234, 2012, A2. Location in patent: Page/Page column 629; 630
[2] Patent: WO2007/88450, 2007, A2. Location in patent: Page/Page column 22
[3] Journal of Medicinal Chemistry, 2016, vol. 59, # 22, p. 10228 - 10243
[4] Patent: US2009/202478, 2009, A1

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