Process for the preparation of 2,2-difluorobenzo[1,3]-dioxole-carbaldehydes and new intermediate products
US5525739A · kind A · utility
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1References
2Claims
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Key dates
| Filing date | Dec 22, 1994 |
| Grant date | Jun 11, 1996 |
| Priority date | — |
| Expiry date | Dec 22, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D317/46
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
According to the invention, a new process has been found for the preparation of 2,2-difluoro-benzo[1,3]-dioxole-cabaldehydes of the formula (I) ##STR1## in which benzo[1,3]dioxole-carbaldehydes are chlorinated, the 2,2-dichloro-dichloromethylbenzo[1,3]dioxoles formed, which are likewise new, are partly fluorinated to give the 2,2-difluoro-dichloromethyl-benzo[1,3]dioxoles, which are likewise new, and these are then reacted with urotropin to give the desired compounds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.