2,3-DIHYDRO-1,4-BENZODIOXIN-6-YLMETHANOL

2,3-DIHYDRO-1,4-BENZODIOXIN-6-YLMETHANOL Property

Boiling point:

129 °C

Density 

1.257±0.06 g/cm3(Predicted)

storage temp. 

Sealed in dry,Room Temperature

pka

14.25±0.10(Predicted)

Appearance

Colorless to light yellow Liquid

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38-51-41-37/38

Safety Statements 

26-36/37/39-39

HazardClass 

IRRITANT

HS Code 

2932990090

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.

2,3-DIHYDRO-1,4-BENZODIOXIN-6-YLMETHANOL Chemical Properties,Usage,Production

Synthesis

General procedure for the synthesis of benzodioxane-6-methanol from 1,4-benzodioxane-6-carboxaldehyde: 2,3-Dihydro-benzo[1,4]dioxine-6-carboxaldehyde [RN 29668-44-8] (3.04 g, 18.54 mmol) was dissolved in ethanol (100 mL) and the solution was cooled to 0 °C. Sodium borohydride (1.41 g, 37.77 mmol) was added to this solution in batches with stirring. The reaction mixture was continued to be stirred at room temperature for 1 hour. Upon completion of the reaction, the reaction was quenched by the slow addition of water (10 mL), followed by concentration under reduced pressure to remove the solvent. The residue was separated by extraction with 5% aqueous sodium bicarbonate (20 mL) and dichloromethane (2 x 50 mL). The organic phases were combined, dried with anhydrous magnesium sulfate, filtered and concentrated under reduced pressure to give the crude product. The crude product was purified by silica gel column chromatography using a gradient elution of dichloromethane and methanol. Benzodioxane-6-methanol was finally obtained as a colorless oil (3.00 g, 97% yield).

References

[1] Patent: WO2003/87098, 2003, A1. Location in patent: Page/Page column 43
[2] Patent: WO2010/83246, 2010, A1. Location in patent: Page/Page column 149-150
[3] Australian Journal of Chemistry, 1984, vol. 37, # 4, p. 893 - 901
[4] Chemical Communications (Cambridge, United Kingdom), 2018, vol. 54, # 83, p. 11805 - 11808
[5] Tetrahedron, 2001, vol. 57, # 39, p. 8297 - 8303