2,3-DIFLUORO-6-METHOXYBENZALDEHYDE Chemical Properties

Melting point:

55-57

Boiling point:

233.0±35.0 °C(Predicted)

Density 

1.289±0.06 g/cm3(Predicted)

storage temp. 

under inert gas (nitrogen or Argon) at 2-8°C

form 

powder to crystal

color 

White to Light yellow to Light orange

Sensitive 

Air Sensitive

InChI

InChI=1S/C8H6F2O2/c1-12-7-3-2-6(9)8(10)5(7)4-11/h2-4H,1H3

InChIKey

AKOJAYHBKACKNJ-UHFFFAOYSA-N

SMILES

C(=O)C1=C(OC)C=CC(F)=C1F

CAS DataBase Reference

187543-87-9(CAS DataBase Reference)

Safety Information

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-37

Hazard Note 

Irritant/Air Sensitive

HS Code 

29130000

2,3-DIFLUORO-6-METHOXYBENZALDEHYDE Usage And Synthesis

Synthesis

a) General procedure for the synthesis of 2,3-difluoro-6-methoxybenzaldehyde: A 2 M solution of diisopropylaminolithium THF/n-heptane (171 mL, 341 mmol) was diluted with dry THF (250 mL) under nitrogen protection and cooled to -75°C. A solution of 3,4-difluoroanisole (46.8 g, 325 mmol) in anhydrous THF (100 mL) was added slowly dropwise and stirred for 1 hour keeping the temperature at -75 °C. Subsequently, dry N,N-dimethylformamide (27.6 mL, 358 mmol) was added slowly and stirring was continued at -70 °C for 10 min. After the reaction was completed, acetic acid (30 mL) and water (400 mL) were added and warmed to 10 °C. The reaction mixture was extracted with ether (2 x 300 mL). The organic phases were combined and washed sequentially with water (250 mL), 0.2N aqueous hydrochloric acid (400 mL) and brine (2 x 250 mL), dried with anhydrous magnesium sulfate, and the solvent was concentrated under reduced pressure to give a red to orange oil, which was allowed to stand and crystallized. Purification by recrystallization from ether/petroleum ether (40-60 °C) afforded the target product 2,3-difluoro-6-methoxybenzaldehyde (53.0 g, 95% yield).1H NMR (300 MHz, CDCl3) δ: 10.40 (1H, s, CHO), 7.37 (1H, q, ArH), 6.71 (1H, m, ArH), 3.93 ( 3H, s, OCH3).

References

[1] Bioorganic and Medicinal Chemistry Letters, 2004, vol. 14, # 21, p. 5395 - 5399
[2] Patent: US2009/118546, 2009, A1. Location in patent: Page/Page column 5-6
[3] Patent: WO2004/43904, 2004, A1. Location in patent: Page 39 - 40
[4] Patent: US2011/124686, 2011, A1. Location in patent: Page/Page column 45
[5] Patent: WO2017/221092, 2017, A1. Location in patent: Paragraph 00142

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