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:
May. 09, 1978
Filed:
Sep. 10, 1976
Yani Christidis, Paris, FR;
Alain Schouteeten, Villiers Le Bel, FR;
Nobel Hoechst Chimie, Puteaux, FR;
Abstract
This is an improved process of manufacturing N-acyl derivatives of glycines .alpha.-substituted by radicals with an aromatic nature by condensation of the addition product of glyoxylic acid and an amide, with an aromatic compound. In a first stage, the reaction is carried out at low temperature, in a concentrated sulfuric medium, of an aliphatic nitrile of the formula R--C.tbd.N in which R is a radical selected from the group of substituted and unsubstituted, saturated and unsaturated alkyl radicals, with a concentrated aqueous solution of glyoxylic acid. Then in a second stage, the mixture obtained is condensed also at low temperature with a compound of aromatic nature not including a hydroxyl group and having at least one substitutable free hydrogen, and the resulting product is collected. The concentrated sulfuric acid may be supplemented with acetic acid during the second stage. A surface active agent may be also added in this stage. The products are valuable intermediates for the preparation of semi-synthetic penicillins.