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CAS No. : | 113209-68-0 | MDL No. : | MFCD06202344 |
Formula : | C9H7FO2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | HRPULQFHSZKTNA-UHFFFAOYSA-N |
M.W : | 166.15 | Pubchem ID : | 14653132 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H335 | Packing Group: | |
GHS Pictogram: |
* All experimental methods are cited from the reference, please refer to the original source for details. We do not guarantee the accuracy of the content in the reference.
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
With sodium tetrahydroborate; In methanol; at 0 - 20℃; for 18h; | At a temperature of 0 0C, sodium borohydride (7.4 g, 195 mmol) was added portion-wise to a mixture of 7-fluoro-2,3-dihydro-4/-/-chromen-4-one and 8-fluoro-2,3-dihydro-4/-/-chromen-4-one (16.2 g, 97.5 mmol) in methanol (200 ml). After a period of 1 hour at 0 0C and 17 hours at room temperature, the reaction mixture was quenched with saturated ammonium chloride solution (400 ml) and water (200 ml), and extracted with dichloromethane (2 x). The combined organic phases were washed with water and saturated sodium chloride solution, dried over magnesium sulfate, and the solvent was evaporated. The yellow residue crystallized slowly. The title compound was isolated as mixture with 8- fluorochroman-4-ol (16.28 g, 99 % yield). |
Yield | Reaction Conditions | Operation in experiment |
---|---|---|
A solution of 3-(3-fluorophenoxy)propanoic acid (20.0 g, 108 mmol) in toluene (230 ml) and thionyl chloride (64.3 g, 0.54 mol) was refluxed for 17 hours. The reaction mixture was concentrated several times in the presence of toluene. A solution of the yellow oily residue in chloroform (200 ml) was cooled to -65 0C and treated with trifluoromethanesulfonic acid (48.0 ml, 0.54 mol, addition over 45 min). The brown solution was gradually warmed to room temperature. After a period of 17 h, the reaction mixture was poured on ice water (1 I) and the phases were separated. The aqueous phase was extracted with chloroform (200 ml). The combined organic phases were washed with 1 N sodium hydroxide solution (2 x 200 ml), water, and saturated sodium chloride solution, and dried over magnei- sum sulfate. Evaporation of the solvent afforded the title compound as mixture with 8-fluoro-2,3- dihydro-4/-/-chromen-4-one (16.26 g of a yellow solid, 91 % yield). |
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