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:
Jul. 01, 2014
Filed:
Nov. 09, 2011
Norbert Lui, Odenthal, DE;
Christian Funke, Leichlingen, DE;
Jens-dietmar Heinrich, Burscheid, DE;
Thomas Norbert Müller, Monheim, DE;
Norbert Lui, Odenthal, DE;
Christian Funke, Leichlingen, DE;
Jens-Dietmar Heinrich, Burscheid, DE;
Thomas Norbert Müller, Monheim, DE;
Bayer Cropscience AG, Monheim, DE;
Abstract
A process for the preparation of 2,2-difluoroethylamine of the formula (I)CHFCHNH  (I)comprising the stages (i) and (ii):stage (i): reaction of 2,2-difluoro-1-haloethane of the formula (II)CHF—CHHal  (II)in which Hal is chlorine, bromine or iodine,with prop-2-en-1-amine of the formula (III) to give N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) preferably in the presence of an acid scavenger,andstage (ii): removal of the allyl group from the N-(2,2-difluoroethyl)prop-2-en-1-amine of the formula (IV) obtained in stage (i) to give 2,2-difluoroethylamine of the formula (I) or a salt thereof.