3,4-DIMETHOXY-2'-HYDROXYCHALCONE

3,4-DIMETHOXY-2'-HYDROXYCHALCONE Property

Melting point:

113 - 115°C

Boiling point:

466.4±45.0 °C(Predicted)

Density 

1.203±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

solubility 

Chloroform (Slightly), Ethyl Acetate (Slightly)

form 

Solid

pka

7.67±0.30(Predicted)

color 

Yellow to Orange

Stability:

Light Sensitive

Safety

HS Code 

2914409000

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

3,4-DIMETHOXY-2'-HYDROXYCHALCONE Chemical Properties,Usage,Production

Uses

2''-Hydroxy-3,4-dimethoxychalcone, is a building block used in various chemical synthesis such as in the synthesis of new flavanoid and chalcone derivatives as antimicrobial agent by green chemistry approach.

Synthesis

The method is applicable to compounds that do not contain free phenolic hydroxyl groups or when the phenolic hydroxyl groups are protected as methyl or benzyl ethers. The corresponding 2'-hydroxyacetophenone (10 mmol) was dissolved in anhydrous THF (25 mL), and NaH (25 mmol, 1 g 60% mineral oil dispersion) was added to the solution in batches under nitrogen protection with vigorous stirring. After the hydrogen release ceased, a corresponding solution of anhydrous THF (25 mL) with veratraldehyde (10 mmol) was added slowly and dropwise over a period of 15 minutes, followed by stirring of the reaction mixture at room temperature for 16 hours (unless otherwise indicated). Upon completion of the reaction, the mixture was carefully poured into ice water (100 mL) to quench the excess NaH and stirred until the hydrogen release stopped completely. The mixture was acidified with 25% HCl and subsequently extracted with ethyl acetate (3 x 50 mL). The organic layers were combined and washed sequentially with water (3 x 50 mL) and brine (50 mL) and then dried with anhydrous MgSO4. The solution was concentrated under reduced pressure to 1/3 of the original volume at 40 °C, then cooled at 0 °C for 12 h. The crystalline product was collected by filtration. The purity of 2'-hydroxychalcone obtained in this way is sufficient for most applications. Analytically pure samples require further purification by column chromatography. Good yields of chalcone can be obtained by this method. Additional product can be obtained by evaporating the solvent from the mother liquor and purifying by column chromatography.

References

[1] Bioorganic and Medicinal Chemistry, 2011, vol. 19, # 10, p. 3060 - 3073
[2] Bioorganic and Medicinal Chemistry Letters, 2016, vol. 26, # 17, p. 4241 - 4245
[3] Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2009, vol. 48, # 9, p. 1311 - 1314
[4] Biocatalysis and Biotransformation, 2013, vol. 31, # 4, p. 160 - 167
[5] Chemische Berichte, 1905, vol. 38, p. 2178