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:
Mar. 22, 1983
Filed:
Sep. 09, 1981
Applicant:
Inventors:
Assignee:
Rutgerswerke Aktiengesellschaft, Frankfurt am Main, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548469 ; 548490 ; 548491 ;
Abstract
An improved process for the preparation of 5-chloro-indole comprising reacting indoline in a chlorine-inert organic solvent with an acylating agent of an organic carboxylic acid to obtain the corresponding 1-acyl-indoline, reacting the latter in the presence of water and a basic agent with chlorine to form 5-chloro-1-acyl-indoline, subjecting the latter to saponification to obtain 5-chloro-indoline and reacting the latter in a water-immiscible organic solvent by heating with an aromatic nitrocompound in the presence of a finely powdered ruthenium catalyst to form 5-chloro-indole in excellent yields.