| Identification | Back Directory | [Name]
5,7-difluorochroman-4-one | [CAS]
844648-22-2 | [Synonyms]
5,7-difluorochroman-4-one
5,7-Difluoro-2,3-dihydro-4H-chromen-4-one
5,7-Difluoro-3,4-dihydro-4H-chromen-4-one
5,7-DIFLUORO-2,3-DIHYDRO-1-BENZOPYRAN-4-ONE
5,7-difluoro-3,4-dihydro-2H-1-benzopyran-4-one
4H-1-Benzopyran-4-one, 5,7-difluoro-2,3-dihydro- | [Molecular Formula]
C9H6F2O2 | [MDL Number]
MFCD11518474 | [MOL File]
844648-22-2.mol | [Molecular Weight]
184.14 |
| Chemical Properties | Back Directory | [Boiling point ]
283℃ | [density ]
1.392 | [Fp ]
121℃ | [storage temp. ]
Sealed in dry,Room Temperature | [Appearance]
White to light yellow Solid | [InChI]
InChI=1S/C9H6F2O2/c10-5-3-6(11)9-7(12)1-2-13-8(9)4-5/h3-4H,1-2H2 | [InChIKey]
OJVRCPGUGZXUAP-UHFFFAOYSA-N | [SMILES]
C1OC2=CC(F)=CC(F)=C2C(=O)C1 |
| Hazard Information | Back Directory | [Uses]
5,7-Difluorochroman-4-one is used as a reagent in the prepaation of tetrazolinone compounds,used as pest control agents. | [Synthesis]
At 50 °C, 3-(3,5-difluorophenoxy)propionic acid (20.0 g, 99 mmol) was added to 60 mL of concentrated sulfuric acid in batches and stirred until completely dissolved. The resulting yellow-green solution was stirred continuously at 50 °C for 1.5 hours. Upon completion of the reaction, the mixture was cooled to room temperature and slowly poured into 800 mL of ice water. After standing for 1 hour, the colorless precipitate was collected by filtration and washed well with cold water. The resulting 5,7-difluorobenzodihydropyran-4-one was dried over phosphorus pentoxide to give 15.69 g of colorless solid in 86% yield. | [References]
[1] Patent: WO2008/151927, 2008, A2. Location in patent: Page/Page column 61
[2] Patent: KR2018/11830, 2018, A. Location in patent: Paragraph 0061; 0076; 0077
[3] Patent: US2005/38032, 2005, A1. Location in patent: Page/Page column 31 |
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