Process of preparation of tetrafluoro 2,3-dihydrobenzofurans
US4730062A · kind A · utility
4Cited by
1References
11Claims
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Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Mar 8, 1988 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D405/12
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Tetrafluorobenzofurans of the formula ##STR1## are prepared by contacting, at elevated temperature in an aprotic solvent, an ether of the formula ##STR2## with a catalytic mixture of metallic cooper and a polydentate or other ligand, wherein R.sup.1 is hydrogen, nitro, amino, phthalimido or acetylimido, R.sup.2 is at least one of hydrogen, halo, cyano, alkyl, hydroxy, alkoxy, acyl, acyloxy, alkoxycarbonyl, alkoxycarbonylalkyl, phenyl, phenyloxy, trifluoromethyl or dialkylamino. The products are intermediates in the preparation of pyrazoline insecticides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.