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CAS No. : | 126163-56-2 | MDL No. : | MFCD07368025 |
Formula : | C8H8F2O2 | Boiling Point : | No data available |
Linear Structure Formula : | - | InChI Key : | PKIYFPSPIFCDDB-UHFFFAOYSA-N |
M.W : | 174.14 | Pubchem ID : | 14495763 |
Synonyms : |
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Signal Word: | Warning | Class: | |
Precautionary Statements: | P261-P280-P305+P351+P338 | UN#: | |
Hazard Statements: | H302-H315-H319-H332-H335 | Packing Group: | |
GHS Pictogram: |
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* 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 |
---|---|---|
90.8% | second step: the water system in the previous step, start stirring to control the temperature at 20-25 C and add 59.5g (0.525mol) of 30.0% hydrogen peroxide dropwise. After the dropwise addition, the temperature is kept for 2.0 hours. The detection of 2,3-difluoro-4-methoxybenzeneboronic acid in the liquid phase of sample delivery is less than 0.2%. After the reaction was completed, the pH value of the 15% aqueous hydrochloric acid solution was adjusted to 6-7, and the crude product was obtained by suction filtration. After distillation, 63.2g (0.36mol) of 2,3-difluoro-4-ethoxyphenol was obtained. The yield was 90.8% and the purity was 99.97%. . The maximum impurity in gas phase detection is 37ppm. | |
69.8% | 2) In a 1 L four-reaction vessel, 326.7 g of tetrahydrofuran and 132.9 g of glacial acetic acid were added, stirred for 30 min,Adding 110.0g 2.3-difluoro-4-ethoxybenzeneboronic acid crude, stirring for half an hour, the control temperature between 15 ~ 25 C,Dropping 111. 1 g of hydrogen peroxide, stirring was added dropwise insulation lh, sample testing, raw material residue 0.15%To the vessel was added water 200.0g and 15. lg sodium sulfite treatment, stratification, the upper organic phase rejection rate was 2.3-difluoro-4-ethoxy phenol crude 85.0g, distilled product 64.8g, GC purity: 99 ? 96 %, Two-step yield 69 ? 8% |