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:
Oct. 02, 2018
Filed:
Oct. 08, 2015
Syngenta Participations Ag, Basel, CH;
Helmars Smits, Stein, CH;
Paul Knochel, Muchen, DE;
Thomas Klatt, München, DE;
Matthias Becker, Gauting, DE;
SYNGENTA PARTICIPATIONS AG, Basel, CH;
Abstract
The invention relates to a process for the preparation of compound of formula (I) wherein Ris halogen and Ris halogen or hydrogen; comprising a) reacting the compound of formula (II) in an aprotic organic solvent in the presence of an aprotic polar co-solvent with a magnesium amide base followed by a halogenating agent, to the compound of formula I wherein Ris halogen and Ris hydrogen, and b) reacting the compound of formula (I), wherein Ris chloro and Ris hydrogen, in an aprotic organic solvent in the presence of an aprotic polar co-solvent with a magnesium amide base followed by a halogenating agent to a compound of formula I, wherein Ris chloro and Ris halogen.