The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1997
Filed:
Oct. 11, 1995
Applicant:
Inventors:
Assignee:
Ciba-Geigy Corporation, Tarrytown, NY (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562423 ; 562861 ;
Abstract
The invention relates to a process for the preparation of polyalkylated aromatic carboxylic acids of formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are each independently of one another hydrogen, C.sub.1 -C.sub.20 alkyl, halogen or C.sub.5 -C.sub.8 cycloalkyl, with the proviso that at least two of the substituents R.sub.1, R.sub.2, R.sub.3, R.sub.4 or R.sub.5 are alkyl and/or cycloalkyl, by reacting corresponding aromatic hydrocarbons with carbon dioxide, which reaction is carried out observing special ratios of temperature and pressure. The invention furthermore relates to a one-pot process for the preparation of the corresponding acyl halides.