Patent · US Expired

Process for the preparation of benzoic acid derivatives

US4990661A · kind A · utility

5Cited by

1References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Uwe Petersen · Leverkusen, DE
Michael Schriewer · Odenthal, DE
Ernst Kysela · Bensberg, DE
Klaus Grohe · Odenthal, DE

Key dates

Filing date	Mar 29, 1989
Grant date	Feb 5, 1991
Priority date	—
Expiry date	Mar 29, 2009

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC07C51/60
WIPO fieldOrganic fine chemistry
WIPO sectorChemistry

Abstract

A process for the preparation of a compound of the formula ##STR1## in which X.sup.1 and X.sup.2 each independently is chlorine or fluorine, and PA0 Y is chlorine, bromine, fluorine or iodine, comprising subjecting a compound of the formula ##STR2## to a Sandmeyer or Balz-Schiemann reaction thereby to produce a carboxylic acid of the formula ##STR3## and converting the carboxylic acid (Ia) into an acyl chloride of the formula ##STR4## The compound (II) is new. The products are known intermediates for anti-bacterials.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.