Patent · US Expired

2,2-difluorobenzo (1,3)-dioxole-carbaldehydes and new intermediate products

US5420308A · kind A · utility

2Cited by

4References

3Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Peter Andres · Ginsheim-Gustavsburg, DE
Albrecht Marhold · Leverkusen, DE

Key dates

Filing date	Mar 4, 1994
Grant date	May 30, 1995
Priority date	—
Expiry date	Mar 4, 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-carbaldehydes 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.